• Paolo Bonzini's avatar
    KVM: x86: avoid incorrect writes to host MSR_IA32_SPEC_CTRL · 6441fa61
    Paolo Bonzini authored
    If the guest is configured to have SPEC_CTRL but the host does not
    (which is a nonsensical configuration but these are not explicitly
    forbidden) then a host-initiated MSR write can write vmx->spec_ctrl
    (respectively svm->spec_ctrl) and trigger a #GP when KVM tries to
    restore the host value of the MSR.  Add a more comprehensive check
    for valid bits of SPEC_CTRL, covering host CPUID flags and,
    since we are at it and it is more correct that way, guest CPUID
    flags too.
    
    For AMD, remove the unnecessary is_guest_mode check around setting
    the MSR interception bitmap, so that the code looks the same as
    for Intel.
    
    Cc: Jim Mattson <jmattson@redhat.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    6441fa61
x86.h 9.03 KB