2017-05-23 11:52-0700, Jim Mattson:
> 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@xxxxxxxxxx>
> ---
IIUC, we don't even need faster accesses as BNDCFGS MSR should usually
be written once per boot and never read,
Reviewed-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
