tree e286f82c594dd3acb4ae53113c6c2d2dd1eb76b2
parent 481c99e311dc3bf6c971c3a41a886da0b749d165
author Jim Mattson <jmattson@google.com> 1495565572 -0700
committer Sasha Levin <alexander.levin@verizon.com> 1501111660 -0400

kvm: vmx: Do not disable intercepts for BNDCFGS

[ Upstream commit a8b6fda38f80e75afa3b125c9e7f2550b579454b ]

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: Sasha Levin <alexander.levin@verizon.com>