KVM: nVMX: handle page fault in vmread fix
During backport
f7eea636c3d5 ("KVM: nVMX: handle page fault in vmread"),
there was a mistake the exception reference should be passed to function
kvm_write_guest_virt_system, instead of NULL, other wise, we will get
NULL pointer deref, eg
kvm-unit-test triggered a NULL pointer deref below:
[ 948.518437] kvm [24114]: vcpu0, guest rIP: 0x407ef9 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR 0x3, nop
[ 949.106464] BUG: unable to handle kernel NULL pointer dereference at
0000000000000000
[ 949.106707] PGD 0 P4D 0
[ 949.106872] Oops: 0002 [#1] SMP
[ 949.107038] CPU: 2 PID: 24126 Comm: qemu-2.7 Not tainted 4.19.77-pserver #4.19.77-1+feature+daily+update+
20191005.1625+
a4168bb~deb9
[ 949.107283] Hardware name: Dell Inc. Precision Tower 3620/09WH54, BIOS 2.7.3 01/31/2018
[ 949.107549] RIP: 0010:kvm_write_guest_virt_system+0x12/0x40 [kvm]
[ 949.107719] Code: c0 5d 41 5c 41 5d 41 5e 83 f8 03 41 0f 94 c0 41 c1 e0 02 e9 b0 ed ff ff 0f 1f 44 00 00 48 89 f0 c6 87 59 56 00 00 01 48 89 d6 <49> c7 00 00 00 00 00 89 ca 49 c7 40 08 00 00 00 00 49 c7 40 10 00
[ 949.108044] RSP: 0018:
ffffb31b0a953cb0 EFLAGS:
00010202
[ 949.108216] RAX:
000000000046b4d8 RBX:
ffff9e9f415b0000 RCX:
0000000000000008
[ 949.108389] RDX:
ffffb31b0a953cc0 RSI:
ffffb31b0a953cc0 RDI:
ffff9e9f415b0000
[ 949.108562] RBP:
00000000d2e14928 R08:
0000000000000000 R09:
0000000000000000
[ 949.108733] R10:
0000000000000000 R11:
0000000000000000 R12:
ffffffffffffffc8
[ 949.108907] R13:
0000000000000002 R14:
ffff9e9f4f26f2e8 R15:
0000000000000000
[ 949.109079] FS:
00007eff8694c700(0000) GS:
ffff9e9f51a80000(0000) knlGS:
0000000031415928
[ 949.109318] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
[ 949.109495] CR2:
0000000000000000 CR3:
00000003be53b002 CR4:
00000000003626e0
[ 949.109671] DR0:
0000000000000000 DR1:
0000000000000000 DR2:
0000000000000000
[ 949.109845] DR3:
0000000000000000 DR6:
00000000fffe0ff0 DR7:
0000000000000400
[ 949.110017] Call Trace:
[ 949.110186] handle_vmread+0x22b/0x2f0 [kvm_intel]
[ 949.110356] ? vmexit_fill_RSB+0xc/0x30 [kvm_intel]
[ 949.110549] kvm_arch_vcpu_ioctl_run+0xa98/0x1b30 [kvm]
[ 949.110725] ? kvm_vcpu_ioctl+0x388/0x5d0 [kvm]
[ 949.110901] kvm_vcpu_ioctl+0x388/0x5d0 [kvm]
[ 949.111072] do_vfs_ioctl+0xa2/0x620
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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