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Sean Christopherson [Tue, 13 Jul 2021 16:32:57 +0000 (09:32 -0700)]
KVM: x86: Move EDX initialization at vCPU RESET to common code
Move the EDX initialization at vCPU RESET, which is now identical between
VMX and SVM, into common code.
No functional change intended.
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-20-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:56 +0000 (09:32 -0700)]
KVM: x86: Consolidate APIC base RESET initialization code
Consolidate the APIC base RESET logic, which is currently spread out
across both x86 and vendor code. For an in-kernel APIC, the vendor code
is redundant. But for a userspace APIC, KVM relies on the vendor code
to initialize vcpu->arch.apic_base. Hoist the vcpu->arch.apic_base
initialization above the !apic check so that it applies to both flavors
of APIC emulation, and delete the vendor code.
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-19-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:55 +0000 (09:32 -0700)]
KVM: x86: Open code necessary bits of kvm_lapic_set_base() at vCPU RESET
Stuff vcpu->arch.apic_base and apic->base_address directly during APIC
reset, as opposed to bouncing through kvm_set_apic_base() while fudging
the ENABLE bit during creation to avoid the other, unwanted side effects.
This is a step towards consolidating the APIC RESET logic across x86,
VMX, and SVM.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-18-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:54 +0000 (09:32 -0700)]
KVM: VMX: Stuff vcpu->arch.apic_base directly at vCPU RESET
Write vcpu->arch.apic_base directly instead of bouncing through
kvm_set_apic_base(). This is a glorified nop, and is a step towards
cleaning up the mess that is local APIC creation.
When using an in-kernel APIC, kvm_create_lapic() explicitly sets
vcpu->arch.apic_base to MSR_IA32_APICBASE_ENABLE to avoid its own
kvm_lapic_set_base() call in kvm_lapic_reset() from triggering state
changes. That call during RESET exists purely to set apic->base_address
to the default base value. As a result, by the time VMX gets control,
the only missing piece is the BSP bit being set for the reset BSP.
For a userspace APIC, there are no side effects to process (for the APIC).
In both cases, the call to kvm_update_cpuid_runtime() is a nop because
the vCPU hasn't yet been exposed to userspace, i.e. there can't be any
CPUID entries.
No functional change intended.
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-17-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:53 +0000 (09:32 -0700)]
KVM: x86: Set BSP bit in reset BSP vCPU's APIC base by default
Set the BSP bit appropriately during local APIC "reset" instead of
relying on vendor code to clean up at a later point. This is a step
towards consolidating the local APIC, VMX, and SVM xAPIC initialization
code.
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-16-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:52 +0000 (09:32 -0700)]
KVM: x86: Don't force set BSP bit when local APIC is managed by userspace
Don't set the BSP bit in vcpu->arch.apic_base when the local APIC is
managed by userspace. Forcing all vCPUs to be BSPs is non-sensical, and
was dead code when it was added by commit
97222cc83163 ("KVM: Emulate
local APIC in kernel"). At the time, kvm_lapic_set_base() was invoked
if and only if the local APIC was in-kernel (and it couldn't be called
before the vCPU created its APIC).
kvm_lapic_set_base() eventually gained generic usage, but the latent bug
escaped notice because the only true consumer would be the guest itself
in the form of an explicit RDMSRs on APs. Out of Linux, SeaBIOS, and
EDK2/OVMF, only OVMF consumes the BSP bit from the APIC_BASE MSR. For
the vast majority of usage in OVMF, BSP confusion would be benign.
OVMF's BSP election upon SMI rendezvous might be broken, but practically
no one runs KVM with an out-of-kernel local APIC, let alone does so while
utilizing SMIs with OVMF.
Fixes:
97222cc83163 ("KVM: Emulate local APIC in kernel")
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-15-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:51 +0000 (09:32 -0700)]
KVM: x86: Migrate the PIT only if vcpu0 is migrated, not any BSP
Make vcpu0 the arbitrary owner of the PIT, as was intended when PIT
migration was added by commit
2f5997140f22 ("KVM: migrate PIT timer").
The PIT was unintentionally turned into being owned by the BSP by commit
c5af89b68abb ("KVM: Introduce kvm_vcpu_is_bsp() function."), and was then
unintentionally converted to a shared ownership model when
kvm_vcpu_is_bsp() was modified to check the APIC base MSR instead of
hardcoding vcpu0 as the BSP.
Functionally, this just means the PIT's hrtimer is migrated less often.
The real motivation is to remove the usage of kvm_vcpu_is_bsp(), so that
more legacy/broken crud can be removed in a future patch.
Fixes:
58d269d8cccc ("KVM: x86: BSP in MSR_IA32_APICBASE is writable")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-14-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:50 +0000 (09:32 -0700)]
KVM: x86: Remove defunct BSP "update" in local APIC reset
Remove a BSP APIC update in kvm_lapic_reset() that is a glorified and
confusing nop. When the code was originally added, kvm_vcpu_is_bsp()
queried kvm->arch.bsp_vcpu, i.e. the intent was to set the BSP bit in the
BSP vCPU's APIC. But, stuffing the BSP bit at INIT was wrong since the
guest can change its BSP(s); this was fixed by commit
58d269d8cccc ("KVM:
x86: BSP in MSR_IA32_APICBASE is writable").
In other words, kvm_vcpu_is_bsp() is now purely a reflection of
vcpu->arch.apic_base.MSR_IA32_APICBASE_BSP, thus the update will always
set the current value and kvm_lapic_set_base() is effectively a nop if
the new and old values match. The RESET case, which does need to stuff
the BSP for the reset vCPU, is handled by vendor code (though this will
soon be moved to common code).
No functional change intended.
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-13-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:49 +0000 (09:32 -0700)]
KVM: x86: WARN if the APIC map is dirty without an in-kernel local APIC
WARN if KVM ends up in a state where it thinks its APIC map needs to be
recalculated, but KVM is not emulating the local APIC. This is mostly
to document KVM's "rules" in order to provide clarity in future cleanups.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-12-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:46 +0000 (09:32 -0700)]
KVM: SVM: Drop explicit MMU reset at RESET/INIT
Drop an explicit MMU reset in SVM's vCPU RESET/INIT flow now that the
common x86 path correctly handles conditional MMU resets, e.g. if INIT
arrives while the vCPU is in 64-bit mode.
This reverts commit
ebae871a509d ("kvm: svm: reset mmu on VCPU reset").
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-9-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:45 +0000 (09:32 -0700)]
KVM: VMX: Remove explicit MMU reset in enter_rmode()
Drop an explicit MMU reset when entering emulated real mode now that the
vCPU INIT/RESET path correctly handles conditional MMU resets, e.g. if
INIT arrives while the vCPU is in 64-bit mode.
Note, while there are multiple other direct calls to vmx_set_cr0(), i.e.
paths that change CR0 without invoking kvm_post_set_cr0(), only the INIT
emulation can reach enter_rmode(). CLTS emulation only toggles CR.TS,
VM-Exit (and late VM-Fail) emulation cannot architecturally transition to
Real Mode, and VM-Enter to Real Mode is possible if and only if
Unrestricted Guest is enabled (exposed to L1).
This effectively reverts commit
8668a3c468ed ("KVM: VMX: Reset mmu
context when entering real mode")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:44 +0000 (09:32 -0700)]
KVM: SVM: Fall back to KVM's hardcoded value for EDX at RESET/INIT
At vCPU RESET/INIT (mostly RESET), stuff EDX with KVM's hardcoded,
default Family-Model-Stepping ID of 0x600 if CPUID.0x1 isn't defined.
At RESET, the CPUID lookup is guaranteed to "miss" because KVM emulates
RESET before exposing the vCPU to userspace, i.e. userspace can't
possibly have done set the vCPU's CPUID model, and thus KVM will always
write '0'. At INIT, using 0x600 is less bad than using '0'.
While initializing EDX to '0' is _extremely_ unlikely to be noticed by
the guest, let alone break the guest, and can be overridden by
userspace for the RESET case, using 0x600 is preferable as it will allow
consolidating the relevant VMX and SVM RESET/INIT logic in the future.
And, digging through old specs suggests that neither Intel nor AMD have
ever shipped a CPU that initialized EDX to '0' at RESET.
Regarding 0x600 as KVM's default Family, it is a sane default and in
many ways the most appropriate. Prior to the 386 implementations, DX
was undefined at RESET. With the 386, 486, 586/P5, and 686/P6/Athlon,
both Intel and AMD set EDX to 3, 4, 5, and 6 respectively. AMD switched
to using '15' as its primary Family with the introduction of AMD64, but
Intel has continued using '6' for the last few decades.
So, '6' is a valid Family for both Intel and AMD CPUs, is compatible
with both 32-bit and 64-bit CPUs (albeit not a perfect fit for 64-bit
AMD), and of the common Families (3 - 6), is the best fit with respect to
KVM's virtual CPU model. E.g. prior to the P6, Intel CPUs did not have a
STI window. Modern operating systems, Linux included, rely on the STI
window, e.g. for "safe halt", and KVM unconditionally assumes the virtual
CPU has an STI window. Thus enumerating a Family ID of 3, 4, or 5 would
be provably wrong.
Opportunistically remove a stale comment.
Fixes:
66f7b72e1171 ("KVM: x86: Make register state after reset conform to specification")
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:43 +0000 (09:32 -0700)]
KVM: SVM: Require exact CPUID.0x1 match when stuffing EDX at INIT
Do not allow an inexact CPUID "match" when querying the guest's CPUID.0x1
to stuff EDX during INIT. In the common case, where the guest CPU model
is an AMD variant, allowing an inexact match is a nop since KVM doesn't
emulate Intel's goofy "out-of-range" logic for AMD and Hygon. If the
vCPU model happens to be an Intel variant, an inexact match is possible
if and only if the max CPUID leaf is precisely '0'. Aside from the fact
that there's probably no CPU in existence with a single CPUID leaf, if
the max CPUID leaf is '0', that means that CPUID.0.EAX is '0', and thus
an inexact match for CPUID.0x1.EAX will also yield '0'.
So, with lots of twisty logic, no functional change intended.
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:42 +0000 (09:32 -0700)]
KVM: VMX: Set EDX at INIT with CPUID.0x1, Family-Model-Stepping
Set EDX at RESET/INIT based on the userspace-defined CPUID model when
possible, i.e. when CPUID.0x1.EAX is defind by userspace. At RESET/INIT,
all CPUs that support CPUID set EDX to the FMS enumerated in
CPUID.0x1.EAX. If no CPUID match is found, fall back to KVM's default
of 0x600 (Family '6'), which is the least awful approximation of KVM's
virtual CPU model.
Fixes:
6aa8b732ca01 ("[PATCH] kvm: userspace interface")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:41 +0000 (09:32 -0700)]
KVM: SVM: Zero out GDTR.base and IDTR.base on INIT
Explicitly set GDTR.base and IDTR.base to zero when intializing the VMCB.
Functionally this only affects INIT, as the bases are implicitly set to
zero on RESET by virtue of the VMCB being zero allocated.
Per AMD's APM, GDTR.base and IDTR.base are zeroed after RESET and INIT.
Fixes:
04d2cc7780d4 ("KVM: Move main vcpu loop into subarch independent code")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:40 +0000 (09:32 -0700)]
KVM: nVMX: Set LDTR to its architecturally defined value on nested VM-Exit
Set L1's LDTR on VM-Exit per the Intel SDM:
The host-state area does not contain a selector field for LDTR. LDTR is
established as follows on all VM exits: the selector is cleared to
0000H, the segment is marked unusable and is otherwise undefined
(although the base address is always canonical).
This is likely a benign bug since the LDTR is unusable, as it means the
L1 VMM is conditioned to reload its LDTR in order to function properly on
bare metal.
Fixes:
4704d0befb07 ("KVM: nVMX: Exiting from L2 to L1")
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Tue, 13 Jul 2021 16:32:39 +0000 (09:32 -0700)]
KVM: x86: Flush the guest's TLB on INIT
Flush the guest's TLB on INIT, as required by Intel's SDM. Although
AMD's APM states that the TLBs are unchanged by INIT, it's not clear that
that's correct as the APM also states that the TLB is flush on "External
initialization of the processor." Regardless, relying on the guest to be
paranoid is unnecessarily risky, while an unnecessary flush is benign
from a functional perspective and likely has no measurable impact on
guest performance.
Note, as of the April 2021 version of Intels' SDM, it also contradicts
itself with respect to TLB flushing. The overview of INIT explicitly
calls out the TLBs as being invalidated, while a table later in the same
section says they are unchanged.
9.1 INITIALIZATION OVERVIEW:
The major difference is that during an INIT, the internal caches, MSRs,
MTRRs, and x87 FPU state are left unchanged (although, the TLBs and BTB
are invalidated as with a hardware reset)
Table 9-1:
Register Power up Reset INIT
Data and Code Cache, TLBs: Invalid[6] Invalid[6] Unchanged
Given Core2's erratum[*] about global TLB entries not being flush on INIT,
it's safe to assume that the table is simply wrong.
AZ28. INIT Does Not Clear Global Entries in the TLB
Problem: INIT may not flush a TLB entry when:
• The processor is in protected mode with paging enabled and the page global enable
flag is set (PGE bit of CR4 register)
• G bit for the page table entry is set
• TLB entry is present in TLB when INIT occurs
• Software may encounter unexpected page fault or incorrect address translation due
to a TLB entry erroneously left in TLB after INIT.
Workaround: Write to CR3, CR4 (setting bits PSE, PGE or PAE) or CR0 (setting
bits PG or PE) registers before writing to memory early in BIOS
code to clear all the global entries from TLB.
Status: For the steppings affected, see the Summary Tables of Changes.
[*] https://www.intel.com/content/dam/support/us/en/documents/processors/mobile/celeron/sb/320121.pdf
Fixes:
6aa8b732ca01 ("[PATCH] kvm: userspace interface")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20210713163324.627647-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Maxim Levitsky [Tue, 13 Jul 2021 14:20:19 +0000 (17:20 +0300)]
KVM: x86: APICv: drop immediate APICv disablement on current vCPU
Special case of disabling the APICv on the current vCPU right away in
kvm_request_apicv_update doesn't bring much benefit vs raising
KVM_REQ_APICV_UPDATE on it instead, since this request will be processed
on the next entry to the guest.
(the comment about having another #VMEXIT is wrong).
It also hides various assumptions that APIVc enable state matches
the APICv inhibit state, as this special case only makes those states
match on the current vCPU.
Previous patches fixed few such assumptions so now it should be safe
to drop this special case.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <
20210713142023.106183-5-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Mon, 26 Jul 2021 16:30:52 +0000 (12:30 -0400)]
KVM: x86: enable TDP MMU by default
With the addition of fast page fault support, the TDP-specific MMU has reached
feature parity with the original MMU. All my testing in the last few months
has been done with the TDP MMU; switch the default on 64-bit machines.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
David Matlack [Tue, 13 Jul 2021 22:09:55 +0000 (22:09 +0000)]
KVM: x86/mmu: fast_page_fault support for the TDP MMU
Make fast_page_fault interoperate with the TDP MMU by leveraging
walk_shadow_page_lockless_{begin,end} to acquire the RCU read lock and
introducing a new helper function kvm_tdp_mmu_fast_pf_get_last_sptep to
grab the lowest level sptep.
Suggested-by: Ben Gardon <bgardon@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <
20210713220957.
3493520-5-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
David Matlack [Tue, 13 Jul 2021 22:09:54 +0000 (22:09 +0000)]
KVM: x86/mmu: Make walk_shadow_page_lockless_{begin,end} interoperate with the TDP MMU
Acquire the RCU read lock in walk_shadow_page_lockless_begin and release
it in walk_shadow_page_lockless_end when the TDP MMU is enabled. This
should not introduce any functional changes but is used in the following
commit to make fast_page_fault interoperate with the TDP MMU.
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <
20210713220957.
3493520-4-dmatlack@google.com>
[Use if...else instead of if(){return;}]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
David Matlack [Tue, 13 Jul 2021 22:09:53 +0000 (22:09 +0000)]
KVM: x86/mmu: Fix use of enums in trace_fast_page_fault
Enum values have to be exported to userspace since the formatting is not
done in the kernel. Without doing this perf maps RET_PF_FIXED and
RET_PF_SPURIOUS to 0, which results in incorrect output:
$ perf record -a -e kvmmmu:fast_page_fault --filter "ret==3" -- ./access_tracking_perf_test
$ perf script | head -1
[...] new
610006048d25877 spurious 0 fixed 0 <------ should be 1
Fix this by exporting the enum values to userspace with TRACE_DEFINE_ENUM.
Fixes:
c4371c2a682e ("KVM: x86/mmu: Return unique RET_PF_* values if the fault was fixed")
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <
20210713220957.
3493520-3-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
David Matlack [Tue, 13 Jul 2021 22:09:52 +0000 (22:09 +0000)]
KVM: x86/mmu: Rename cr2_or_gpa to gpa in fast_page_fault
fast_page_fault is only called from direct_page_fault where we know the
address is a gpa.
Fixes:
736c291c9f36 ("KVM: x86: Use gpa_t for cr2/gpa to fix TDP support on 32-bit KVM")
Reviewed-by: Ben Gardon <bgardon@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <
20210713220957.
3493520-2-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Peter Xu [Fri, 25 Jun 2021 15:32:07 +0000 (11:32 -0400)]
KVM: Introduce kvm_get_kvm_safe()
Introduce this safe version of kvm_get_kvm() so that it can be called even
during vm destruction. Use it in kvm_debugfs_open() and remove the verbose
comment. Prepare to be used elsewhere.
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <
20210625153214.43106-3-peterx@redhat.com>
[Preserve the comment in kvm_debugfs_open. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Juergen Gross [Thu, 1 Jul 2021 15:41:01 +0000 (17:41 +0200)]
x86/kvm: remove non-x86 stuff from arch/x86/kvm/ioapic.h
The file has been moved to arch/x86 long time ago. Time to get rid of
non-x86 stuff.
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-Id: <
20210701154105.23215-3-jgross@suse.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Peter Xu [Fri, 25 Jun 2021 15:32:06 +0000 (11:32 -0400)]
KVM: X86: Add per-vm stat for max rmap list size
Add a new statistic max_mmu_rmap_size, which stores the maximum size of rmap
for the vm.
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <
20210625153214.43106-2-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Fri, 2 Jul 2021 22:04:51 +0000 (15:04 -0700)]
KVM: x86/mmu: Return old SPTE from mmu_spte_clear_track_bits()
Return the old SPTE when clearing a SPTE and push the "old SPTE present"
check to the caller. Private shadow page support will use the old SPTE
in rmap_remove() to determine whether or not there is a linked private
shadow page.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <
b16bac1fd1357aaf39e425aab2177d3f89ee8318.
1625186503.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Fri, 2 Jul 2021 22:04:50 +0000 (15:04 -0700)]
KVM: x86/mmu: Refactor shadow walk in __direct_map() to reduce indentation
Employ a 'continue' to reduce the indentation for linking a new shadow
page during __direct_map() in preparation for linking private pages.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <
702419686d5700373123f6ea84e7a946c2cad8b4.
1625186503.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Fri, 2 Jul 2021 22:04:29 +0000 (15:04 -0700)]
KVM: x86: Hoist kvm_dirty_regs check out of sync_regs()
Move the kvm_dirty_regs vs. KVM_SYNC_X86_VALID_FIELDS check out of
sync_regs() and into its sole caller, kvm_arch_vcpu_ioctl_run(). This
allows a future patch to allow synchronizing select state for protected
VMs.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <
889017a8d31cea46472e0c64b234ef5919278ed9.
1625186503.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Fri, 2 Jul 2021 22:04:26 +0000 (15:04 -0700)]
KVM: x86/mmu: Mark VM as bugged if page fault returns RET_PF_INVALID
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <
298980aa5fc5707184ac082287d13a800cd9c25f.
1625186503.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Fri, 2 Jul 2021 22:04:25 +0000 (15:04 -0700)]
KVM: x86: Use KVM_BUG/KVM_BUG_ON to handle bugs that are fatal to the VM
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <
0e8760a26151f47dc47052b25ca8b84fffe0641e.
1625186503.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Fri, 2 Jul 2021 22:04:24 +0000 (15:04 -0700)]
KVM: Export kvm_make_all_cpus_request() for use in marking VMs as bugged
Export kvm_make_all_cpus_request() and hoist the request helper
declarations of request up to the KVM_REQ_* definitions in preparation
for adding a "VM bugged" framework. The framework will add KVM_BUG()
and KVM_BUG_ON() as alternatives to full BUG()/BUG_ON() for cases where
KVM has definitely hit a bug (in itself or in silicon) and the VM is all
but guaranteed to be hosed. Marking a VM bugged will trigger a request
to all vCPUs to allow arch code to forcefully evict each vCPU from its
run loop.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Message-Id: <
1d8cbbc8065d831343e70b5dcaea92268145eef1.
1625186503.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Sean Christopherson [Fri, 2 Jul 2021 22:04:23 +0000 (15:04 -0700)]
KVM: Add infrastructure and macro to mark VM as bugged
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <
3a0998645c328bf0895f1290e61821b70f048549.
1625186503.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Wed, 14 Jul 2021 21:37:49 +0000 (17:37 -0400)]
KVM: x86: accept userspace interrupt only if no event is injected
Once an exception has been injected, any side effects related to
the exception (such as setting CR2 or DR6) have been taked place.
Therefore, once KVM sets the VM-entry interruption information
field or the AMD EVENTINJ field, the next VM-entry must deliver that
exception.
Pending interrupts are processed after injected exceptions, so
in theory it would not be a problem to use KVM_INTERRUPT when
an injected exception is present. However, DOSEMU is using
run->ready_for_interrupt_injection to detect interrupt windows
and then using KVM_SET_SREGS/KVM_SET_REGS to inject the
interrupt manually. For this to work, the interrupt window
must be delayed after the completion of the previous event
injection.
Cc: stable@vger.kernel.org
Reported-by: Stas Sergeev <stsp2@yandex.ru>
Tested-by: Stas Sergeev <stsp2@yandex.ru>
Fixes:
71cc849b7093 ("KVM: x86: Fix split-irqchip vs interrupt injection window request")
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Tue, 27 Jul 2021 12:43:10 +0000 (08:43 -0400)]
KVM: add missing compat KVM_CLEAR_DIRTY_LOG
The arguments to the KVM_CLEAR_DIRTY_LOG ioctl include a pointer,
therefore it needs a compat ioctl implementation. Otherwise,
32-bit userspace fails to invoke it on 64-bit kernels; for x86
it might work fine by chance if the padding is zero, but not
on big-endian architectures.
Reported-by: Thomas Sattler
Cc: stable@vger.kernel.org
Fixes:
2a31b9db1535 ("kvm: introduce manual dirty log reprotect")
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Li RongQing [Tue, 27 Jul 2021 11:12:47 +0000 (19:12 +0800)]
KVM: use cpu_relax when halt polling
SMT siblings share caches and other hardware, and busy halt polling
will degrade its sibling performance if its sibling is working
Sean Christopherson suggested as below:
"Rather than disallowing halt-polling entirely, on x86 it should be
sufficient to simply have the hardware thread yield to its sibling(s)
via PAUSE. It probably won't get back all performance, but I would
expect it to be close.
This compiles on all KVM architectures, and AFAICT the intended usage
of cpu_relax() is identical for all architectures."
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Message-Id: <
20210727111247.55510-1-lirongqing@baidu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Maxim Levitsky [Tue, 13 Jul 2021 14:20:18 +0000 (17:20 +0300)]
KVM: SVM: use vmcb01 in svm_refresh_apicv_exec_ctrl
Currently when SVM is enabled in guest CPUID, AVIC is inhibited as soon
as the guest CPUID is set.
AVIC happens to be fully disabled on all vCPUs by the time any guest
entry starts (if after migration the entry can be nested).
The reason is that currently we disable avic right away on vCPU from which
the kvm_request_apicv_update was called and for this case, it happens to be
called on all vCPUs (by svm_vcpu_after_set_cpuid).
After we stop doing this, AVIC will end up being disabled only when
KVM_REQ_APICV_UPDATE is processed which is after we done switching to the
nested guest.
Fix this by just using vmcb01 in svm_refresh_apicv_exec_ctrl for avic
(which is a right thing to do anyway).
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <
20210713142023.106183-4-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Maxim Levitsky [Tue, 13 Jul 2021 14:20:17 +0000 (17:20 +0300)]
KVM: SVM: tweak warning about enabled AVIC on nested entry
It is possible that AVIC was requested to be disabled but
not yet disabled, e.g if the nested entry is done right
after svm_vcpu_after_set_cpuid.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <
20210713142023.106183-3-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Maxim Levitsky [Tue, 13 Jul 2021 14:20:16 +0000 (17:20 +0300)]
KVM: SVM: svm_set_vintr don't warn if AVIC is active but is about to be deactivated
It is possible for AVIC inhibit and AVIC active state to be mismatched.
Currently we disable AVIC right away on vCPU which started the AVIC inhibit
request thus this warning doesn't trigger but at least in theory,
if svm_set_vintr is called at the same time on multiple vCPUs,
the warning can happen.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <
20210713142023.106183-2-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Christian Borntraeger [Mon, 26 Jul 2021 15:01:08 +0000 (17:01 +0200)]
KVM: s390: restore old debugfs names
commit
bc9e9e672df9 ("KVM: debugfs: Reuse binary stats descriptors")
did replace the old definitions with the binary ones. While doing that
it missed that some files are names different than the counters. This
is especially important for kvm_stat which does have special handling
for counters named instruction_*.
Fixes: commit
bc9e9e672df9 ("KVM: debugfs: Reuse binary stats descriptors")
CC: Jing Zhang <jingzhangos@google.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <
20210726150108.5603-1-borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Mon, 26 Jul 2021 16:39:01 +0000 (12:39 -0400)]
KVM: SVM: delay svm_vcpu_init_msrpm after svm->vmcb is initialized
Right now, svm_hv_vmcb_dirty_nested_enlightenments has an incorrect
dereference of vmcb->control.reserved_sw before the vmcb is checked
for being non-NULL. The compiler is usually sinking the dereference
after the check; instead of doing this ourselves in the source,
ensure that svm_hv_vmcb_dirty_nested_enlightenments is only called
with a non-NULL VMCB.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Vineeth Pillai <viremana@linux.microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[Untested for now due to issues with my AMD machine. - Paolo]
David Matlack [Tue, 13 Jul 2021 22:09:57 +0000 (22:09 +0000)]
KVM: selftests: Introduce access_tracking_perf_test
This test measures the performance effects of KVM's access tracking.
Access tracking is driven by the MMU notifiers test_young, clear_young,
and clear_flush_young. These notifiers do not have a direct userspace
API, however the clear_young notifier can be triggered by marking a
pages as idle in /sys/kernel/mm/page_idle/bitmap. This test leverages
that mechanism to enable access tracking on guest memory.
To measure performance this test runs a VM with a configurable number of
vCPUs that each touch every page in disjoint regions of memory.
Performance is measured in the time it takes all vCPUs to finish
touching their predefined region.
Example invocation:
$ ./access_tracking_perf_test -v 8
Testing guest mode: PA-bits:ANY, VA-bits:48, 4K pages
guest physical test memory offset: 0xffdfffff000
Populating memory : 1.337752570s
Writing to populated memory : 0.010177640s
Reading from populated memory : 0.009548239s
Mark memory idle : 23.973131748s
Writing to idle memory : 0.063584496s
Mark memory idle : 24.924652964s
Reading from idle memory : 0.062042814s
Breaking down the results:
* "Populating memory": The time it takes for all vCPUs to perform the
first write to every page in their region.
* "Writing to populated memory" / "Reading from populated memory": The
time it takes for all vCPUs to write and read to every page in their
region after it has been populated. This serves as a control for the
later results.
* "Mark memory idle": The time it takes for every vCPU to mark every
page in their region as idle through page_idle.
* "Writing to idle memory" / "Reading from idle memory": The time it
takes for all vCPUs to write and read to every page in their region
after it has been marked idle.
This test should be portable across architectures but it is only enabled
for x86_64 since that's all I have tested.
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <
20210713220957.
3493520-7-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
David Matlack [Tue, 13 Jul 2021 22:09:56 +0000 (22:09 +0000)]
KVM: selftests: Fix missing break in dirty_log_perf_test arg parsing
There is a missing break statement which causes a fallthrough to the
next statement where optarg will be null and a segmentation fault will
be generated.
Fixes:
9e965bb75aae ("KVM: selftests: Add backing src parameter to dirty_log_perf_test")
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <
20210713220957.
3493520-6-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Juergen Gross [Thu, 1 Jul 2021 15:41:00 +0000 (17:41 +0200)]
x86/kvm: fix vcpu-id indexed array sizes
KVM_MAX_VCPU_ID is the maximum vcpu-id of a guest, and not the number
of vcpu-ids. Fix array indexed by vcpu-id to have KVM_MAX_VCPU_ID+1
elements.
Note that this is currently no real problem, as KVM_MAX_VCPU_ID is
an odd number, resulting in always enough padding being available at
the end of those arrays.
Nevertheless this should be fixed in order to avoid rare problems in
case someone is using an even number for KVM_MAX_VCPU_ID.
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-Id: <
20210701154105.23215-2-jgross@suse.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Vitaly Kuznetsov [Thu, 22 Jul 2021 12:30:18 +0000 (14:30 +0200)]
KVM: x86: Check the right feature bit for MSR_KVM_ASYNC_PF_ACK access
MSR_KVM_ASYNC_PF_ACK MSR is part of interrupt based asynchronous page fault
interface and not the original (deprecated) KVM_FEATURE_ASYNC_PF. This is
stated in Documentation/virt/kvm/msr.rst.
Fixes:
66570e966dd9 ("kvm: x86: only provide PV features if enabled in guest's CPUID")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Message-Id: <
20210722123018.260035-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Mauro Carvalho Chehab [Thu, 22 Jul 2021 09:50:03 +0000 (11:50 +0200)]
docs: virt: kvm: api.rst: replace some characters
The conversion tools used during DocBook/LaTeX/html/Markdown->ReST
conversion and some cut-and-pasted text contain some characters that
aren't easily reachable on standard keyboards and/or could cause
troubles when parsed by the documentation build system.
Replace the occurences of the following characters:
- U+00a0 (' '): NO-BREAK SPACE
as it can cause lines being truncated on PDF output
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-Id: <
ff70cb42d63f3a1da66af1b21b8d038418ed5189.
1626947264.git.mchehab+huawei@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Vitaly Kuznetsov [Thu, 22 Jul 2021 09:26:28 +0000 (11:26 +0200)]
KVM: Documentation: Fix KVM_CAP_ENFORCE_PV_FEATURE_CPUID name
'KVM_CAP_ENFORCE_PV_CPUID' doesn't match the define in
include/uapi/linux/kvm.h.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <
20210722092628.236474-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Vitaly Kuznetsov [Mon, 19 Jul 2021 09:03:22 +0000 (11:03 +0200)]
KVM: nSVM: Swap the parameter order for svm_copy_vmrun_state()/svm_copy_vmloadsave_state()
Make svm_copy_vmrun_state()/svm_copy_vmloadsave_state() interface match
'memcpy(dest, src)' to avoid any confusion.
No functional change intended.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <
20210719090322.625277-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Vitaly Kuznetsov [Fri, 16 Jul 2021 14:41:04 +0000 (16:41 +0200)]
KVM: nSVM: Rename nested_svm_vmloadsave() to svm_copy_vmloadsave_state()
To match svm_copy_vmrun_state(), rename nested_svm_vmloadsave() to
svm_copy_vmloadsave_state().
Opportunistically add missing braces to 'else' branch in
vmload_vmsave_interception().
No functional change intended.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <
20210716144104.465269-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Mon, 19 Jul 2021 14:05:40 +0000 (10:05 -0400)]
Merge tag 'kvmarm-fixes-5.14-1' of git://git./linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/arm64 fixes for 5.14, take #1
- Fix MTE shared page detection
- Fix selftest use of obsolete pthread_yield() in favour of sched_yield()
- Enable selftest's use of PMU registers when asked to
Linus Torvalds [Sun, 18 Jul 2021 21:13:49 +0000 (14:13 -0700)]
Linux 5.14-rc2
Linus Torvalds [Sun, 18 Jul 2021 19:20:27 +0000 (12:20 -0700)]
Merge tag 'perf-tools-fixes-for-v5.14-2021-07-18' of git://git./linux/kernel/git/acme/linux
Pull perf tools fixes from Arnaldo Carvalho de Melo:
- Skip invalid hybrid PMU on hybrid systems when the atom (little) CPUs
are offlined.
- Fix 'perf test' problems related to the recently added hybrid
(BIG/little) code.
- Split ARM's coresight (hw tracing) decode by aux records to avoid
fatal decoding errors.
- Fix add event failure in 'perf probe' when running 32-bit perf in a
64-bit kernel.
- Fix 'perf sched record' failure when CONFIG_SCHEDSTATS is not set.
- Fix memory and refcount leaks detected by ASAn when running 'perf
test', should be clean of warnings now.
- Remove broken definition of __LITTLE_ENDIAN from tools'
linux/kconfig.h, which was breaking the build in some systems.
- Cast PTHREAD_STACK_MIN to int as it may turn into 'long
sysconf(__SC_THREAD_STACK_MIN_VALUE), breaking the build in some
systems.
- Fix libperf build error with LIBPFM4=1.
- Sync UAPI files changed by the memfd_secret new syscall.
* tag 'perf-tools-fixes-for-v5.14-2021-07-18' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux: (35 commits)
perf sched: Fix record failure when CONFIG_SCHEDSTATS is not set
perf probe: Fix add event failure when running 32-bit perf in a 64-bit kernel
perf data: Close all files in close_dir()
perf probe-file: Delete namelist in del_events() on the error path
perf test bpf: Free obj_buf
perf trace: Free strings in trace__parse_events_option()
perf trace: Free syscall tp fields in evsel->priv
perf trace: Free syscall->arg_fmt
perf trace: Free malloc'd trace fields on exit
perf lzma: Close lzma stream on exit
perf script: Fix memory 'threads' and 'cpus' leaks on exit
perf script: Release zstd data
perf session: Cleanup trace_event
perf inject: Close inject.output on exit
perf report: Free generated help strings for sort option
perf env: Fix memory leak of cpu_pmu_caps
perf test maps__merge_in: Fix memory leak of maps
perf dso: Fix memory leak in dso__new_map()
perf test event_update: Fix memory leak of unit
perf test event_update: Fix memory leak of evlist
...
Linus Torvalds [Sun, 18 Jul 2021 18:27:25 +0000 (11:27 -0700)]
Merge tag 'xfs-5.14-fixes-1' of git://git./fs/xfs/xfs-linux
Pull xfs fixes from Darrick Wong:
"A few fixes for issues in the new online shrink code, additional
corrections for my recent bug-hunt w.r.t. extent size hints on
realtime, and improved input checking of the GROWFSRT ioctl.
IOW, the usual 'I somehow got bored during the merge window and
resumed auditing the farther reaches of xfs':
- Fix shrink eligibility checking when sparse inode clusters enabled
- Reset '..' directory entries when unlinking directories to prevent
verifier errors if fs is shrinked later
- Don't report unusable extent size hints to FSGETXATTR
- Don't warn when extent size hints are unusable because the sysadmin
configured them that way
- Fix insufficient parameter validation in GROWFSRT ioctl
- Fix integer overflow when adding rt volumes to filesystem"
* tag 'xfs-5.14-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: detect misaligned rtinherit directory extent size hints
xfs: fix an integer overflow error in xfs_growfs_rt
xfs: improve FSGROWFSRT precondition checking
xfs: don't expose misaligned extszinherit hints to userspace
xfs: correct the narrative around misaligned rtinherit/extszinherit dirs
xfs: reset child dir '..' entry when unlinking child
xfs: check for sparse inode clusters that cross new EOAG when shrinking
Linus Torvalds [Sun, 18 Jul 2021 18:17:06 +0000 (11:17 -0700)]
Merge tag 'iomap-5.14-fixes-1' of git://git./fs/xfs/xfs-linux
Pull iomap fixes from Darrick Wong:
"A handful of bugfixes for the iomap code.
There's nothing especially exciting here, just fixes for UBSAN (not
KASAN as I erroneously wrote in the tag message) warnings about
undefined behavior in the SEEK_DATA/SEEK_HOLE code, and some
reshuffling of per-page block state info to fix some problems with
gfs2.
- Fix KASAN warnings due to integer overflow in SEEK_DATA/SEEK_HOLE
- Fix assertion errors when using inlinedata files on gfs2"
* tag 'iomap-5.14-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
iomap: Don't create iomap_page objects in iomap_page_mkwrite_actor
iomap: Don't create iomap_page objects for inline files
iomap: Permit pages without an iop to enter writeback
iomap: remove the length variable in iomap_seek_hole
iomap: remove the length variable in iomap_seek_data
Linus Torvalds [Sun, 18 Jul 2021 18:10:30 +0000 (11:10 -0700)]
Merge tag 'kbuild-fixes-v5.14' of git://git./linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- Restore the original behavior of scripts/setlocalversion when
LOCALVERSION is set to empty.
- Show Kconfig prompts even for 'make -s'
- Fix the combination of COFNIG_LTO_CLANG=y and CONFIG_MODVERSIONS=y
for older GNU Make versions
* tag 'kbuild-fixes-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
Documentation: Fix intiramfs script name
Kbuild: lto: fix module versionings mismatch in GNU make 3.X
kbuild: do not suppress Kconfig prompts for silent build
scripts/setlocalversion: fix a bug when LOCALVERSION is empty
Robert Richter [Thu, 15 Jul 2021 09:26:02 +0000 (11:26 +0200)]
Documentation: Fix intiramfs script name
Documentation was not changed when renaming the script in commit
80e715a06c2d ("initramfs: rename gen_initramfs_list.sh to
gen_initramfs.sh"). Fixing this.
Basically does:
$ sed -i -e s/gen_initramfs_list.sh/gen_initramfs.sh/g $(git grep -l gen_initramfs_list.sh)
Fixes:
80e715a06c2d ("initramfs: rename gen_initramfs_list.sh to gen_initramfs.sh")
Signed-off-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Lecopzer Chen [Thu, 15 Jul 2021 07:37:16 +0000 (15:37 +0800)]
Kbuild: lto: fix module versionings mismatch in GNU make 3.X
When building modules(CONFIG_...=m), I found some of module versions
are incorrect and set to 0.
This can be found in build log for first clean build which shows
WARNING: EXPORT symbol "XXXX" [drivers/XXX/XXX.ko] version generation failed,
symbol will not be versioned.
But in second build(incremental build), the WARNING disappeared and the
module version becomes valid CRC and make someone who want to change
modules without updating kernel image can't insert their modules.
The problematic code is
+ $(foreach n, $(filter-out FORCE,$^), \
+ $(if $(wildcard $(n).symversions), \
+ ; cat $(n).symversions >> $@.symversions))
For example:
rm -f fs/notify/built-in.a.symversions ; rm -f fs/notify/built-in.a; \
llvm-ar cDPrST fs/notify/built-in.a fs/notify/fsnotify.o \
fs/notify/notification.o fs/notify/group.o ...
`foreach n` shows nothing to `cat` into $(n).symversions because
`if $(wildcard $(n).symversions)` return nothing, but actually
they do exist during this line was executed.
-rw-r--r-- 1 root root 168580 Jun 13 19:10 fs/notify/fsnotify.o
-rw-r--r-- 1 root root 111 Jun 13 19:10 fs/notify/fsnotify.o.symversions
The reason is the $(n).symversions are generated at runtime, but
Makefile wildcard function expends and checks the file exist or not
during parsing the Makefile.
Thus fix this by use `test` shell command to check the file
existence in runtime.
Rebase from both:
1. [https://lore.kernel.org/lkml/
20210616080252.32046-1-lecopzer.chen@mediatek.com/]
2. [https://lore.kernel.org/lkml/
20210702032943.7865-1-lecopzer.chen@mediatek.com/]
Fixes:
38e891849003 ("kbuild: lto: fix module versioning")
Co-developed-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Masahiro Yamada [Wed, 14 Jul 2021 04:23:49 +0000 (13:23 +0900)]
kbuild: do not suppress Kconfig prompts for silent build
When a new CONFIG option is available, Kbuild shows a prompt to get
the user input.
$ make
[ snip ]
Core Scheduling for SMT (SCHED_CORE) [N/y/?] (NEW)
This is the only interactive place in the build process.
Commit
174a1dcc9642 ("kbuild: sink stdout from cmd for silent build")
suppressed Kconfig prompts as well because syncconfig is invoked by
the 'cmd' macro. You cannot notice the fact that Kconfig is waiting
for the user input.
Use 'kecho' to show the equivalent short log without suppressing stdout
from sub-make.
Fixes:
174a1dcc9642 ("kbuild: sink stdout from cmd for silent build")
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Mikulas Patocka [Mon, 12 Jul 2021 19:35:46 +0000 (15:35 -0400)]
scripts/setlocalversion: fix a bug when LOCALVERSION is empty
The commit
042da426f8eb ("scripts/setlocalversion: simplify the short
version part") reduces indentation. Unfortunately, it also changes behavior
in a subtle way - if the user has empty "LOCALVERSION" variable, the plus
sign is appended to the kernel version. It wasn't appended before.
This patch reverts to the old behavior - we append the plus sign only if
the LOCALVERSION variable is not set.
Fixes:
042da426f8eb ("scripts/setlocalversion: simplify the short version part")
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Yang Jihong [Tue, 13 Jul 2021 11:23:58 +0000 (19:23 +0800)]
perf sched: Fix record failure when CONFIG_SCHEDSTATS is not set
The tracepoints trace_sched_stat_{wait, sleep, iowait} are not exposed to user
if CONFIG_SCHEDSTATS is not set, "perf sched record" records the three events.
As a result, the command fails.
Before:
#perf sched record sleep 1
event syntax error: 'sched:sched_stat_wait'
\___ unknown tracepoint
Error: File /sys/kernel/tracing/events/sched/sched_stat_wait not found.
Hint: Perhaps this kernel misses some CONFIG_ setting to enable this feature?.
Run 'perf list' for a list of valid events
Usage: perf record [<options>] [<command>]
or: perf record [<options>] -- <command> [<options>]
-e, --event <event> event selector. use 'perf list' to list available events
Solution:
Check whether schedstat tracepoints are exposed. If no, these events are not recorded.
After:
# perf sched record sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.163 MB perf.data (1091 samples) ]
# perf sched report
run measurement overhead: 4736 nsecs
sleep measurement overhead:
9059979 nsecs
the run test took 999854 nsecs
the sleep test took
8945271 nsecs
nr_run_events: 716
nr_sleep_events: 785
nr_wakeup_events: 0
...
------------------------------------------------------------
Fixes:
2a09b5de235a6 ("sched/fair: do not expose some tracepoints to user if CONFIG_SCHEDSTATS is not set")
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Yafang Shao <laoar.shao@gmail.com>
Link: http://lore.kernel.org/lkml/20210713112358.194693-1-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Yang Jihong [Thu, 15 Jul 2021 06:37:23 +0000 (14:37 +0800)]
perf probe: Fix add event failure when running 32-bit perf in a 64-bit kernel
The "address" member of "struct probe_trace_point" uses long data type.
If kernel is 64-bit and perf program is 32-bit, size of "address"
variable is 32 bits.
As a result, upper 32 bits of address read from kernel are truncated, an
error occurs during address comparison in kprobe_warn_out_range().
Before:
# perf probe -a schedule
schedule is out of .text, skip it.
Error: Failed to add events.
Solution:
Change data type of "address" variable to u64 and change corresponding
address printing and value assignment.
After:
# perf.new.new probe -a schedule
Added new event:
probe:schedule (on schedule)
You can now use it in all perf tools, such as:
perf record -e probe:schedule -aR sleep 1
# perf probe -l
probe:schedule (on schedule@kernel/sched/core.c)
# perf record -e probe:schedule -aR sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.156 MB perf.data (1366 samples) ]
# perf report --stdio
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 1K of event 'probe:schedule'
# Event count (approx.): 1366
#
# Overhead Command Shared Object Symbol
# ........ ............... ................. ............
#
6.22% migration/0 [kernel.kallsyms] [k] schedule
6.22% migration/1 [kernel.kallsyms] [k] schedule
6.22% migration/2 [kernel.kallsyms] [k] schedule
6.22% migration/3 [kernel.kallsyms] [k] schedule
6.15% migration/10 [kernel.kallsyms] [k] schedule
6.15% migration/11 [kernel.kallsyms] [k] schedule
6.15% migration/12 [kernel.kallsyms] [k] schedule
6.15% migration/13 [kernel.kallsyms] [k] schedule
6.15% migration/14 [kernel.kallsyms] [k] schedule
6.15% migration/15 [kernel.kallsyms] [k] schedule
6.15% migration/4 [kernel.kallsyms] [k] schedule
6.15% migration/5 [kernel.kallsyms] [k] schedule
6.15% migration/6 [kernel.kallsyms] [k] schedule
6.15% migration/7 [kernel.kallsyms] [k] schedule
6.15% migration/8 [kernel.kallsyms] [k] schedule
6.15% migration/9 [kernel.kallsyms] [k] schedule
0.22% rcu_sched [kernel.kallsyms] [k] schedule
...
#
# (Cannot load tips.txt file, please install perf!)
#
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jianlin Lv <jianlin.lv@arm.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Li Huafei <lihuafei1@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: http://lore.kernel.org/lkml/20210715063723.11926-1-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Riccardo Mancini [Fri, 16 Jul 2021 14:11:20 +0000 (16:11 +0200)]
perf data: Close all files in close_dir()
When using 'perf report' in directory mode, the first file is not closed
on exit, causing a memory leak.
The problem is caused by the iterating variable never reaching 0.
Fixes:
145520631130bd64 ("perf data: Add perf_data__(create_dir|close_dir) functions")
Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zhen Lei <thunder.leizhen@huawei.com>
Link: http://lore.kernel.org/lkml/20210716141122.858082-1-rickyman7@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Riccardo Mancini [Thu, 15 Jul 2021 16:07:25 +0000 (18:07 +0200)]
perf probe-file: Delete namelist in del_events() on the error path
ASan reports some memory leaks when running:
# perf test "42: BPF filter"
This second leak is caused by a strlist not being dellocated on error
inside probe_file__del_events.
This patch adds a goto label before the deallocation and makes the error
path jump to it.
Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
Fixes:
e7895e422e4da63d ("perf probe: Split del_perf_probe_events()")
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/174963c587ae77fa108af794669998e4ae558338.1626343282.git.rickyman7@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linus Torvalds [Sat, 17 Jul 2021 22:58:24 +0000 (15:58 -0700)]
Merge tag 'soc-fixes-5.14-1' of git://git./linux/kernel/git/soc/soc
Pull ARM SoC fixes from Arnd Bergmann:
"Here are the patches for this week that came as the fallout of the
merge window:
- Two fixes for the NVidia memory controller driver
- multiple defconfig files get patched to turn CONFIG_FB back on
after that is no longer selected by CONFIG_DRM
- ffa and scmpi firmware drivers fixes, mostly addressing compiler
and documentation warnings
- Platform specific fixes for device tree files on ASpeed, Renesas
and NVidia SoC, mostly for recent regressions.
- A workaround for a regression on the USB PHY with devlink when the
usb-nop-xceiv driver is not available until the rootfs is mounted.
- Device tree compiler warnings in Arm Versatile-AB"
* tag 'soc-fixes-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (35 commits)
ARM: dts: versatile: Fix up interrupt controller node names
ARM: multi_v7_defconfig: Make NOP_USB_XCEIV driver built-in
ARM: configs: Update u8500_defconfig
ARM: configs: Update Vexpress defconfig
ARM: configs: Update Versatile defconfig
ARM: configs: Update RealView defconfig
ARM: configs: Update Integrator defconfig
arm: Typo s/PCI_IXP4XX_LEGACY/IXP4XX_PCI_LEGACY/
firmware: arm_scmi: Fix range check for the maximum number of pending messages
firmware: arm_scmi: Avoid padding in sensor message structure
firmware: arm_scmi: Fix kernel doc warnings about return values
firmware: arm_scpi: Fix kernel doc warnings
firmware: arm_scmi: Fix kernel doc warnings
ARM: shmobile: defconfig: Restore graphical consoles
firmware: arm_ffa: Fix a possible ffa_linux_errmap buffer overflow
firmware: arm_ffa: Fix the comment style
firmware: arm_ffa: Simplify probe function
firmware: arm_ffa: Ensure drivers provide a probe function
firmware: arm_scmi: Fix possible scmi_linux_errmap buffer overflow
firmware: arm_scmi: Ensure drivers provide a probe function
...
Linus Torvalds [Sat, 17 Jul 2021 20:27:00 +0000 (13:27 -0700)]
Revert "mm/slub: use stackdepot to save stack trace in objects"
This reverts commit
788691464c29455346dc613a3b43c2fb9e5757a4.
It's not clear why, but it causes unexplained problems in entirely
unrelated xfs code. The most likely explanation is some slab
corruption, possibly triggered due to CONFIG_SLUB_DEBUG_ON. See [1].
It ends up having a few other problems too, like build errors on
arch/arc, and Geert reporting it using much more memory on m68k [3] (it
probably does so elsewhere too, but it is probably just more noticeable
on m68k).
The architecture issues (both build and memory use) are likely just
because this change effectively force-enabled STACKDEPOT (along with a
very bad default value for the stackdepot hash size). But together with
the xfs issue, this all smells like "this commit was not ready" to me.
Link: https://lore.kernel.org/linux-xfs/YPE3l82acwgI2OiV@infradead.org/
Link: https://lore.kernel.org/lkml/202107150600.LkGNb4Vb-lkp@intel.com/
Link: https://lore.kernel.org/lkml/CAMuHMdW=eoVzM1Re5FVoEN87nKfiLmM2+Ah7eNu2KXEhCvbZyA@mail.gmail.com/
Reported-by: Christoph Hellwig <hch@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Sat, 17 Jul 2021 20:09:23 +0000 (13:09 -0700)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley:
"One core fix for an oops which can occur if the error handling thread
fails to start for some reason and the driver is removed.
The other fixes are all minor ones in drivers"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: ufs: core: Add missing host_lock in ufshcd_vops_setup_xfer_req()
scsi: mpi3mr: Fix W=1 compilation warnings
scsi: pm8001: Clean up kernel-doc and comments
scsi: zfcp: Report port fc_security as unknown early during remote cable pull
scsi: core: Fix bad pointer dereference when ehandler kthread is invalid
scsi: fas216: Fix a build error
scsi: core: Fix the documentation of the scsi_execute() time parameter
Linus Torvalds [Sat, 17 Jul 2021 19:56:50 +0000 (12:56 -0700)]
Merge tag '5.14-rc1-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
"Eight cifs/smb3 fixes, including three for stable.
Three are DFS related fixes, and two to fix problems pointed out by
static checkers"
* tag '5.14-rc1-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
cifs: do not share tcp sessions of dfs connections
SMB3.1.1: fix mount failure to some servers when compression enabled
cifs: added WARN_ON for all the count decrements
cifs: fix missing null session check in mount
cifs: handle reconnect of tcon when there is no cached dfs referral
cifs: fix the out of range assignment to bit fields in parse_server_interfaces
cifs: Do not use the original cruid when following DFS links for multiuser mounts
cifs: use the expiry output of dns_query to schedule next resolution
Linus Torvalds [Sat, 17 Jul 2021 19:48:06 +0000 (12:48 -0700)]
Merge tag 'linux-kselftest-kunit-fixes-5.14-rc2' of git://git./linux/kernel/git/shuah/linux-kselftest
Pull kunit fixes from Shuah Khan:
"Fixes to kunit tool and documentation:
- fix asserts on older python versions
- fixes to misleading error messages when TAP header format is
incorrect or when file is missing
- documentation fix: drop obsolete information about uml_abort
coverage
- remove unnecessary annotations"
* tag 'linux-kselftest-kunit-fixes-5.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
kunit: tool: Assert the version requirement
kunit: tool: remove unnecessary "annotations" import
Documentation: kunit: drop obsolete note about uml_abort for coverage
kunit: tool: Fix error messages for cases of no tests and wrong TAP header
Linus Torvalds [Sat, 17 Jul 2021 19:44:32 +0000 (12:44 -0700)]
Merge tag 'linux-kselftest-fixes-5.14-rc2' of git://git./linux/kernel/git/shuah/linux-kselftest
Pull kselftest fix from Shuah Khan:
"A fix to memory-hotplug hot-remove test to stop spamming logs with
dump_page() entries and slowing the system down to a crawl"
* tag 'linux-kselftest-fixes-5.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
selftests: memory-hotplug: avoid spamming logs with dump_page(), ratio limit hot-remove error test
Linus Torvalds [Sat, 17 Jul 2021 19:36:51 +0000 (12:36 -0700)]
Merge tag 'trace-v5.14-5' of git://git./linux/kernel/git/rostedt/linux-trace
Pull tracing fix from Steven Rostedt:
"Fix the histogram logic from possibly crashing the kernel
Working on the histogram code, I found that if you dereference a char
pointer in a trace event that happens to point to user space, it can
crash the kernel, as it does no checks of that pointer. I have code
coming that will do this better, so just remove this ability to treat
character pointers in trace events as stings in the histogram"
* tag 'trace-v5.14-5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracing: Do not reference char * as a string in histograms
Linus Torvalds [Sat, 17 Jul 2021 02:08:09 +0000 (19:08 -0700)]
Merge tag 'devicetree-fixes-for-5.14-1' of git://git./linux/kernel/git/robh/linux
Pull devicetree fixes from Rob Herring:
- Drop 'resets' as required on renesas,du
- Moving of fixed string patterns for 'properties' instead of
'patternProperties'
- Drop more redundant minItems/maxItems that we merged in the merge
window
- Indentation warning fix for sja1105
* tag 'devicetree-fixes-for-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
dt-bindings: display: renesas,du: Make resets optional on R-Car H1
dt-bindings: Move fixed string 'patternProperties' to 'properties'
dt-bindings: More dropping redundant minItems/maxItems
dt-bindings: net: dsa: sja1105: Fix indentation warnings
Linus Torvalds [Sat, 17 Jul 2021 02:00:53 +0000 (19:00 -0700)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux
Pull arm64 fixes from Will Deacon:
"The bulk of the diffstat consists of changes to our uaccess routines
so that they fall back to bytewise copying prior to reporting complete
failure when the initial (multi-byte) access faults.
However, the most disappointing change here is that we've had to bump
ARCH_DMA_MINALIGN back to 128 bytes thanks to Qualcomm's "Kryo" CPU,
which ended up in the MSM8996 mobile SoC. Still, at least we're now
aware of this design and one of the hardware designers confirmed the
L2 cacheline size for us.
Summary:
- Fix instrumentation annotations for entry code
- Ensure kernel MTE state is restored correctly on resume from suspend
- Fix MTE fault from new strlen() routine
- Fallback to byte-wise accesses on initial uaccess fault
- Bump Clang requirement for BTI
- Revert ARCH_DMA_MINALIGN back to 128 bytes (shakes fist at Qualcomm)"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: entry: fix KCOV suppression
arm64: entry: add missing noinstr
arm64: mte: fix restoration of GCR_EL1 from suspend
arm64: Avoid premature usercopy failure
arm64: Restrict ARM64_BTI_KERNEL to clang 12.0.0 and newer
Revert "arm64: cache: Lower ARCH_DMA_MINALIGN to 64 (L1_CACHE_BYTES)"
arm64: Add missing header <asm/smp.h> in two files
arm64: fix strlen() with CONFIG_KASAN_HW_TAGS
Sudeep Holla [Thu, 1 Jul 2021 13:21:18 +0000 (14:21 +0100)]
ARM: dts: versatile: Fix up interrupt controller node names
Once the new schema interrupt-controller/arm,vic.yaml is added, we get
the below warnings:
arch/arm/boot/dts/versatile-ab.dt.yaml:
intc@
10140000: $nodename:0: 'intc@
10140000' does not match
'^interrupt-controller(@[0-9a-f,]+)*$'
arch/arm/boot/dts/versatile-ab.dt.yaml:
intc@
10140000: 'clear-mask' does not match any of the regexes
Fix the node names for the interrupt controller to conform
to the standard node name interrupt-controller@.. Also drop invalid
clear-mask property.
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20210701132118.759454-1-sudeep.holla@arm.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Arnd Bergmann [Fri, 16 Jul 2021 21:04:13 +0000 (23:04 +0200)]
Merge tag 'aspeed-5.14-devicetree-2' of git://git./linux/kernel/git/joel/bmc into arm/fixes
ASPEED device tree fixes for 5.14
- eMMC phase corrections so Tacoma and Everest can boot
- VUART irq polarity fix for e3c246d4i, using new bindings
- I2C address fix for Rainier power supply
- GPIO line name fixes
* tag 'aspeed-5.14-devicetree-2' of git://git.kernel.org/pub/scm/linux/kernel/git/joel/bmc:
ARM: dts: aspeed: everest: PSU #3 address change
ARM: dts: everest: Add phase corrections for eMMC
ARM: dts: tacoma: Add phase corrections for eMMC
ARM: dts: aspeed: Update e3c246d4i vuart properties
ARM: dts: aspeed: Fix AST2600 machines line names
Link: https://lore.kernel.org/r/CACPK8XefdPzeOUDnDgk9cHQEs-9wF_ZSPdYQRzuNOpGZTyGUKQ@mail.gmail.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Stefan Wahren [Sat, 10 Jul 2021 11:04:55 +0000 (13:04 +0200)]
ARM: multi_v7_defconfig: Make NOP_USB_XCEIV driver built-in
The usage of usb-nop-xceiv PHY on Raspberry Pi boards with BCM283x has
been a "regression source" a lot of times. The last case is breakage of
USB mass storage boot has been commit
e590474768f1 ("driver core: Set
fw_devlink=on by default") for multi_v7_defconfig. As long as
NOP_USB_XCEIV is configured as module, the dwc2 USB driver defer probing
endlessly and prevent booting from USB mass storage device. So make
the driver built-in as in bcm2835_defconfig and arm64/defconfig.
Fixes:
e590474768f1 ("driver core: Set fw_devlink=on by default")
Reported-by: Ojaswin Mujoo <ojaswin98@gmail.com>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1625915095-23077-1-git-send-email-stefan.wahren@i2se.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Linus Walleij [Mon, 12 Jul 2021 08:55:22 +0000 (10:55 +0200)]
ARM: configs: Update u8500_defconfig
The platform lost the framebuffer due to a commit solving a
circular dependency in v5.14-rc1, so add it back in by explicitly
selecting the framebuffer.
The U8500 has also gained a few systems using touchscreens from
Cypress, Melfas and Zinitix so add these at the same time as
we're updating the defconfig anyway.
Fixes:
f611b1e7624c ("drm: Avoid circular dependencies for CONFIG_FB")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Cc: phone-devel@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>
Cc: Arnd Bergmann <arnd@kernel.org>
Cc: Stephan Gerhold <stephan@gerhold.net>
Cc: newbyte@disroot.org
Link: https://lore.kernel.org/r/20210712085522.672482-1-linus.walleij@linaro.org'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Linus Walleij [Tue, 13 Jul 2021 13:37:08 +0000 (15:37 +0200)]
ARM: configs: Update Vexpress defconfig
This updates the Versatile Express defconfig for the changes
in the v5.14-rc1 kernel:
- The Framebuffer CONFIG_FB needs to be explicitly selected
or we don't get any framebuffer anymore. DRM has stopped to
select FB because of circular dependency.
- CONFIG_CMA options were moved around.
- CONFIG_MODULES options were moved around.
- CONFIG_CRYPTO_HW was moved around.
Fixes:
f611b1e7624c ("drm: Avoid circular dependencies for CONFIG_FB")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20210713133708.94397-1-linus.walleij@linaro.org'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Linus Walleij [Wed, 14 Jul 2021 08:18:19 +0000 (10:18 +0200)]
ARM: configs: Update Versatile defconfig
This updates the Versatile defconfig for the changes
in the v5.14-rc1 kernel:
- The Framebuffer CONFIG_FB needs to be explicitly selected
or we don't get any framebuffer anymore. DRM has stopped to
select FB because of circular dependency.
- The CONFIG_FB_MODE_HELPERS are not needed when using DRM
framebuffer emulation as DRM does.
- The Acorn fonts are removed, the default framebuffer font
works fine. I don't know why this was selected in the first
place or how the Kconfig was altered so it was removed.
Fixes:
f611b1e7624c ("drm: Avoid circular dependencies for CONFIG_FB")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210714081819.139210-1-linus.walleij@linaro.org'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Linus Walleij [Wed, 14 Jul 2021 09:00:40 +0000 (11:00 +0200)]
ARM: configs: Update RealView defconfig
This updates the RealView defconfig for the changes
in the v5.14-rc1 kernel:
- The Framebuffer CONFIG_FB needs to be explicitly selected
or we don't get any framebuffer anymore. DRM has stopped to
select FB because of circular dependency.
- The CONFIG_FB_MODE_HELPERS are not needed when using DRM
framebuffer emulation as DRM does.
- Drop two unused penguin logos.
Fixes:
f611b1e7624c ("drm: Avoid circular dependencies for CONFIG_FB")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210714090040.182381-1-linus.walleij@linaro.org'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Linus Walleij [Wed, 14 Jul 2021 12:27:03 +0000 (14:27 +0200)]
ARM: configs: Update Integrator defconfig
This updates the Integrator defconfig for the changes
in the v5.14-rc1 kernel:
- The Framebuffer CONFIG_FB needs to be explicitly selected
or we don't get any framebuffer anymore. DRM has stopped to
select FB because of circular dependency.
- Drop the unused Matrox FB drivers that are only used with
specific PCI cards.
Fixes:
f611b1e7624c ("drm: Avoid circular dependencies for CONFIG_FB")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210714122703.212609-1-linus.walleij@linaro.org'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Arnd Bergmann [Fri, 16 Jul 2021 21:01:24 +0000 (23:01 +0200)]
Merge tag 'scmi-fixes-5.14' of git://git./linux/kernel/git/sudeep.holla/linux into arm/fixes
ARM SCMI fixes for v5.14
A small set of fixes:
- adding check for presence of probe while registering the driver to
prevent NULL pointer access
- dropping the duplicate check as the driver core already takes care of it
- fix for possible scmi_linux_errmap buffer overflow
- fix to avoid sensor message structure padding
- fix the range check for the maximum number of pending SCMI messages
- fix for various kernel-doc warnings
* tag 'scmi-fixes-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
firmware: arm_scmi: Fix range check for the maximum number of pending messages
firmware: arm_scmi: Avoid padding in sensor message structure
firmware: arm_scmi: Fix kernel doc warnings about return values
firmware: arm_scpi: Fix kernel doc warnings
firmware: arm_scmi: Fix kernel doc warnings
firmware: arm_scmi: Fix possible scmi_linux_errmap buffer overflow
firmware: arm_scmi: Ensure drivers provide a probe function
firmware: arm_scmi: Simplify device probe function on the bus
Link: https://lore.kernel.org/r/20210714165831.2617437-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Arnd Bergmann [Fri, 16 Jul 2021 21:00:44 +0000 (23:00 +0200)]
Merge tag 'arm-ffa-fixes-5.14' of git://git./linux/kernel/git/sudeep.holla/linux into arm/fixes
Arm FF-A fixes for v5.14
A small set of fixes:
- adding check for presence of probe while registering the driver to
prevent NULL pointer access
- dropping the duplicate check as the driver core already takes care of it
- fixing possible ffa_linux_errmap buffer overflow and
- fixing kernel-doc warning for comment style
* tag 'arm-ffa-fixes-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
firmware: arm_ffa: Fix a possible ffa_linux_errmap buffer overflow
firmware: arm_ffa: Fix the comment style
firmware: arm_ffa: Simplify probe function
firmware: arm_ffa: Ensure drivers provide a probe function
Link: https://lore.kernel.org/r/20210714165806.2617325-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Geert Uytterhoeven [Wed, 14 Jul 2021 09:33:43 +0000 (11:33 +0200)]
arm: Typo s/PCI_IXP4XX_LEGACY/IXP4XX_PCI_LEGACY/
Kconfig symbol PCI_IXP4XX_LEGACY does not exist, but IXP4XX_PCI_LEGACY
does.
Fixes:
d5d9f7ac58ea1041 ("ARM/ixp4xx: Make NEED_MACH_IO_H optional")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/82ce37c617293521f095a945a255456b9512769c.1626255077.git.geert+renesas@glider.be'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Arnd Bergmann [Fri, 16 Jul 2021 20:57:07 +0000 (22:57 +0200)]
Merge tag 'tegra-for-5.14-arm64-dt-fixes' of git://git./linux/kernel/git/tegra/linux into arm/fixes
arm64: tegra: Device tree fixes for v5.14-rc1
This contains two late fixes for Tegra194 device tree files to restore
USB and audio functionality after enabling system-wide IOMMU support.
* tag 'tegra-for-5.14-arm64-dt-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
arm64: tegra: Enable SMMU support for USB on Tegra194
arm64: tegra: Enable audio IOMMU support on Tegra194
Link: https://lore.kernel.org/r/20210709150220.2543875-1-thierry.reding@gmail.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Arnd Bergmann [Fri, 16 Jul 2021 20:54:55 +0000 (22:54 +0200)]
Merge tag 'renesas-fixes-for-v5.14-tag1' of git://git./linux/kernel/git/geert/renesas-devel into arm/fixes
Renesas fixes for v5.14
- Fix a clock/reset handling design issue on the new RZ/G2L SoC,
requiring an atomic change to DT binding definitions, clock driver,
and DTS,
- Restore graphical consoles in the shmobile_defconfig.
* tag 'renesas-fixes-for-v5.14-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-devel:
ARM: shmobile: defconfig: Restore graphical consoles
dt-bindings: clock: r9a07g044-cpg: Update clock/reset definitions
clk: renesas: r9a07g044: Add P2 Clock support
clk: renesas: r9a07g044: Fix P1 Clock
clk: renesas: r9a07g044: Rename divider table
clk: renesas: rzg2l: Add multi clock PM support
Link: https://lore.kernel.org/r/cover.1626253929.git.geert+renesas@glider.be
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Arnd Bergmann [Fri, 16 Jul 2021 20:50:56 +0000 (22:50 +0200)]
Merge tag 'memory-controller-drv-tegra-5.14-3' of git://git./linux/kernel/git/krzk/linux-mem-ctrl into arm/fixes
Memory controller drivers for v5.14 - Tegra SoC, late fixes
Two fixes for recent series of changes in Tegra SoC memory controller
drivers:
1. Add a stub for tegra_mc_probe_device() to fix compile testing of
arm-smmu without TEGRA_MC.
2. Fix arm-smmu dtschema syntax.
* tag 'memory-controller-drv-tegra-5.14-3' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl:
dt-bindings: arm-smmu: Fix json-schema syntax
memory: tegra: Add compile-test stub for tegra_mc_probe_device()
Link: https://lore.kernel.org/r/20210625073604.13562-1-krzysztof.kozlowski@canonical.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Linus Torvalds [Fri, 16 Jul 2021 20:35:04 +0000 (13:35 -0700)]
Merge tag 'docs-5.14-2' of git://git.lwn.net/linux
Pull documentation fixes from Jonathan Corbet:
"A handful of fixes in and around documentation.
Some funky quotes in LICENSES/dual/CC-BY-4.0 were giving spdxcheck.py
grief; that has been fixed on both ends. Also a couple of features
updates and one docs build fix"
* tag 'docs-5.14-2' of git://git.lwn.net/linux:
docs/zh_CN: add a missing space character
Documentation/features: Add THREAD_INFO_IN_TASK feature matrix
Documentation/features: Update the ARCH_HAS_TICK_BROADCAST entry
LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"
scripts/spdxcheck.py: Strictly read license files in utf-8
Linus Torvalds [Fri, 16 Jul 2021 19:31:44 +0000 (12:31 -0700)]
Merge tag 'block-5.14-2021-07-16' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
- NVMe fixes via Christoph:
- fix various races in nvme-pci when shutting down just after
probing (Casey Chen)
- fix a net_device leak in nvme-tcp (Prabhakar Kushwaha)
- Fix regression in xen-blkfront by cleaning up the removal state
machine (Christoph)
- Fix tag_set and queue cleanup ordering regression in nbd (Wang)
- Fix tag_set and queue cleanup ordering regression in pd (Guoqing)
* tag 'block-5.14-2021-07-16' of git://git.kernel.dk/linux-block:
xen-blkfront: sanitize the removal state machine
nbd: fix order of cleaning up the queue and freeing the tagset
pd: fix order of cleaning up the queue and freeing the tagset
nvme-pci: do not call nvme_dev_remove_admin from nvme_remove
nvme-pci: fix multiple races in nvme_setup_io_queues
nvme-tcp: use __dev_get_by_name instead dev_get_by_name for OPT_HOST_IFACE
Linus Torvalds [Fri, 16 Jul 2021 19:27:33 +0000 (12:27 -0700)]
Merge tag 'io_uring-5.14-2021-07-16' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
"Two small fixes: one fixing the process target of a check, and the
other a minor issue with the drain error handling"
* tag 'io_uring-5.14-2021-07-16' of git://git.kernel.dk/linux-block:
io_uring: fix io_drain_req()
io_uring: use right task for exiting checks
Linus Torvalds [Fri, 16 Jul 2021 18:20:53 +0000 (11:20 -0700)]
Merge tag 'zonefs-5.14-rc2' of git://git./linux/kernel/git/dlemoal/zonefs
Pull zonefs fix from Damien Le Moal:
"A single patch to remove an unnecessary NULL bio check (from
Xianting)"
* tag 'zonefs-5.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs:
zonefs: remove redundant null bio check
Linus Torvalds [Fri, 16 Jul 2021 18:14:54 +0000 (11:14 -0700)]
Merge tag 'drm-fixes-2021-07-16' of git://anongit.freedesktop.org/drm/drm
Pull drm fixes from Dave Airlie:
"Regular rc2 fixes though a bit more than usual at rc2 stage, people
must have been testing early or else some fixes from last week got a
bit laggy.
There is one larger change in the amd fixes to amalgamate some power
management code on the newer chips with the code from the older chips,
it should only affects chips where support was introduced in rc1 and
it should make future fixes easier to maintain probably a good idea to
merge it now.
Otherwise it's mostly fixes across the board.
dma-buf:
- Fix fence leak in sync_file_merge() error code
drm/panel:
- nt35510: Don't fail on DSI reads
fbdev:
- Avoid use-after-free by not deleting current video mode
ttm:
- Avoid NULL-ptr deref in ttm_range_man_fini()
vmwgfx:
- Fix a merge commit
qxl:
- fix a TTM regression
amdgpu:
- SR-IOV fixes
- RAS fixes
- eDP fixes
- SMU13 code unification to facilitate fixes in the future
- Add new renoir DID
- Yellow Carp fixes
- Beige Goby fixes
- Revert a bunch of TLB fixes that caused regressions
- Revert an LTTPR display regression
amdkfd
- Fix VRAM access regression
- SVM fixes
i915:
- Fix -EDEADLK handling regression
- Drop the page table optimisation"
* tag 'drm-fixes-2021-07-16' of git://anongit.freedesktop.org/drm/drm: (29 commits)
drm/amdgpu: add another Renoir DID
drm/ttm: add a check against null pointer dereference
drm/i915/gtt: drop the page table optimisation
drm/i915/gt: Fix -EDEADLK handling regression
drm/amd/pm: Add waiting for response of mode-reset message for yellow carp
Revert "drm/amdkfd: Add heavy-weight TLB flush after unmapping"
Revert "drm/amdgpu: Add table_freed parameter to amdgpu_vm_bo_update"
Revert "drm/amdkfd: Make TLB flush conditional on mapping"
Revert "drm/amdgpu: Fix warning of Function parameter or member not described"
Revert "drm/amdkfd: Add memory sync before TLB flush on unmap"
drm/amd/pm: Fix BACO state setting for Beige_Goby
drm/amdgpu: Restore msix after FLR
drm/amdkfd: Allow CPU access for all VRAM BOs
drm/amdgpu/display - only update eDP's backlight level when necessary
drm/amdkfd: handle fault counters on invalid address
drm/amdgpu: Correct the irq numbers for virtual crtc
drm/amd/display: update header file name
drm/amd/pm: drop smu_v13_0_1.c|h files for yellow carp
drm/amd/display: remove faulty assert
Revert "drm/amd/display: Always write repeater mode regardless of LTTPR"
...
Linus Torvalds [Fri, 16 Jul 2021 18:08:57 +0000 (11:08 -0700)]
Merge branch 'urgent' of git://git./linux/kernel/git/paulmck/linux-rcu
Pull RCU fixes from Paul McKenney:
- fix regressions induced by a merge-window change in scheduler
semantics, which means that smp_processor_id() can no longer be used
in kthreads using simple affinity to bind themselves to a specific
CPU.
- fix a bug in Tasks Trace RCU that was thought to be strictly
theoretical. However, production workloads have started hitting this,
so these fixes need to be merged sooner rather than later.
- fix a minor printk()-format-mismatch issue introduced during the
merge window.
* 'urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
rcu: Fix pr_info() formats and values in show_rcu_gp_kthreads()
rcu-tasks: Don't delete holdouts within trc_wait_for_one_reader()
rcu-tasks: Don't delete holdouts within trc_inspect_reader()
refscale: Avoid false-positive warnings in ref_scale_reader()
scftorture: Avoid false-positive warnings in scftorture_invoker()
Geert Uytterhoeven [Wed, 14 Jul 2021 10:19:36 +0000 (12:19 +0200)]
dt-bindings: display: renesas,du: Make resets optional on R-Car H1
The "resets" property is not present on R-Car Gen1 SoCs.
Supporting it would require migrating from renesas,cpg-clocks to
renesas,cpg-mssr.
Reflect this in the DT bindings by removing the global "required:
resets". All SoCs that do have "resets" properties already have
SoC-specific rules making it required.
Fixes:
99d66127fad25ebb ("dt-bindings: display: renesas,du: Convert binding to YAML")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/98575791b154d80347d5b78132c1d53f5315ee62.1626257936.git.geert+renesas@glider.be
Signed-off-by: Rob Herring <robh@kernel.org>
Riccardo Mancini [Thu, 15 Jul 2021 16:07:24 +0000 (18:07 +0200)]
perf test bpf: Free obj_buf
ASan reports some memory leaks when running:
# perf test "42: BPF filter"
The first of these leaks is caused by obj_buf never being deallocated in
__test__bpf.
This patch adds the missing free.
Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
Fixes:
ba1fae431e74bb42 ("perf test: Add 'perf test BPF'")
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lore.kernel.org/lkml/60f3ca935fe6672e7e866276ce6264c9e26e4c87.1626343282.git.rickyman7@gmail.com
[ Added missing stdlib.h include ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Paulo Alcantara [Fri, 16 Jul 2021 00:53:53 +0000 (21:53 -0300)]
cifs: do not share tcp sessions of dfs connections
Make sure that we do not share tcp sessions of dfs mounts when
mounting regular shares that connect to same server. DFS connections
rely on a single instance of tcp in order to do failover properly in
cifs_reconnect().
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Xianting Tian [Wed, 30 Jun 2021 14:33:36 +0000 (10:33 -0400)]
zonefs: remove redundant null bio check
bio_alloc() with __GFP_DIRECT_RECLAIM, which is included in
GFP_NOFS, never fails, see comments in bio_alloc_bioset().
Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Linus Torvalds [Fri, 16 Jul 2021 01:05:31 +0000 (18:05 -0700)]
Revert "Makefile: Enable -Wimplicit-fallthrough for Clang"
This reverts commit
b7eb335e26a9c7f258c96b3962c283c379d3ede0.
It turns out that the problem with the clang -Wimplicit-fallthrough
warning is not about the kernel source code, but about clang itself, and
that the warning is unusable until clang fixes its broken ways.
In particular, when you enable this warning for clang, you not only get
warnings about implicit fallthroughs. You also get this:
warning: fallthrough annotation in unreachable code [-Wimplicit-fallthrough]
which is completely broken becasue it
(a) doesn't even tell you where the problem is (seriously: no line
numbers, no filename, no nothing).
(b) is fundamentally broken anyway, because there are perfectly valid
reasons to have a fallthrough statement even if it turns out that
it can perhaps not be reached.
In the kernel, an example of that second case is code in the scheduler:
switch (state) {
case cpuset:
if (IS_ENABLED(CONFIG_CPUSETS)) {
cpuset_cpus_allowed_fallback(p);
state = possible;
break;
}
fallthrough;
case possible:
where if CONFIG_CPUSETS is enabled you actually never hit the
fallthrough case at all. But that in no way makes the fallthrough
wrong.
So the warning is completely broken, and enabling it for clang is a very
bad idea.
In the meantime, we can keep the gcc option enabled, and make the gcc
build use
-Wimplicit-fallthrough=5
which means that we will at least continue to require a proper
fallthrough statement, and that gcc won't silently accept the magic
comment versions. Because gcc does this all correctly, and while the odd
"=5" part is kind of obscure, it's documented in [1]:
"-Wimplicit-fallthrough=5 doesn’t recognize any comments as
fallthrough comments, only attributes disable the warning"
so if clang ever fixes its bad behavior we can try enabling it there again.
Link: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
Cc: Kees Cook <keescook@chromium.org>
Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Dave Airlie [Fri, 16 Jul 2021 00:52:58 +0000 (10:52 +1000)]
Merge tag 'drm-intel-fixes-2021-07-15' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes
Two regression fixes targeting stable:
- Fix -EDEADLK handling regression (Ville)
- Drop the page table optimisation (Matt)
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/YPA8y1DSCp2EbtpC@intel.com
Linus Torvalds [Fri, 16 Jul 2021 00:36:36 +0000 (17:36 -0700)]
Merge tag 'configfs-5.13-1' of git://git.infradead.org/users/hch/configfs
Pull configfs fix from Christoph Hellwig:
- fix the read and write iterators (Bart Van Assche)
* tag 'configfs-5.13-1' of git://git.infradead.org/users/hch/configfs:
configfs: fix the read and write iterators
Dave Airlie [Thu, 15 Jul 2021 23:51:41 +0000 (09:51 +1000)]
Merge tag 'drm-misc-fixes-2021-07-15' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes
Short summary of fixes pull (less than what git shortlog provides):
* fbdev: Avoid use-after-free by not deleting current video mode
* ttm: Avoid NULL-ptr deref in ttm_range_man_fini()
* vmwgfx: Fix a merge commit
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/YO/yoFO+iSEqnIH0@linux-uq9g