OSDN Git Service

kvm: vmx: Do not disable intercepts for BNDCFGS
authorJim Mattson <jmattson@google.com>
Tue, 23 May 2017 18:52:52 +0000 (11:52 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 21 Jul 2017 05:44:59 +0000 (07:44 +0200)
commitbe6f33a61f335cb06b3c8c2cee90214f97c4bda3
treee73442c82e47986fb3c7a24f530bca1c465621ed
parentc6f3576ed0f21058629d5461eb014c1e0e3f7c4d
kvm: vmx: Do not disable intercepts for BNDCFGS

commit a8b6fda38f80e75afa3b125c9e7f2550b579454b upstream.

The MSR permission bitmaps are shared by all VMs. However, some VMs
may not be configured to support MPX, even when the host does. If the
host supports VMX and the guest does not, we should intercept accesses
to the BNDCFGS MSR, so that we can synthesize a #GP
fault. Furthermore, if the host does not support MPX and the
"ignore_msrs" kvm kernel parameter is set, then we should intercept
accesses to the BNDCFGS MSR, so that we can skip over the rdmsr/wrmsr
without raising a #GP fault.

Fixes: da8999d31818fdc8 ("KVM: x86: Intel MPX vmx and msr handle")
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/kvm/vmx.c