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| author | Paolo Bonzini | 2014-03-05 23:19:52 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2014-03-17 12:21:39 +0100 |
| commit | 93c4adc7afedf9b0ec190066d45b6d67db5270da (patch) | |
| tree | 8b941c7e959fab7a677df0d6d7c4052ec468342d /arch/x86/kvm/svm.c | |
| parent | KVM: x86: Add nested virtualization support for MPX (diff) | |
| download | kernel-qcow2-linux-93c4adc7afedf9b0ec190066d45b6d67db5270da.tar.gz kernel-qcow2-linux-93c4adc7afedf9b0ec190066d45b6d67db5270da.tar.xz kernel-qcow2-linux-93c4adc7afedf9b0ec190066d45b6d67db5270da.zip | |
KVM: x86: handle missing MPX in nested virtualization
When doing nested virtualization, we may be able to read BNDCFGS but
still not be allowed to write to GUEST_BNDCFGS in the VMCS. Guard
writes to the field with vmx_mpx_supported(), and similarly hide the
MSR from userspace if the processor does not support the field.
We could work around this with the generic MSR save/load machinery,
but there is only a limited number of MSR save/load slots and it is
not really worthwhile to waste one for a scenario that should not
happen except in the nested virtualization case.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index a449c3d76cba..2136cb6ab132 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -4089,6 +4089,11 @@ static bool svm_invpcid_supported(void) return false; } +static bool svm_mpx_supported(void) +{ + return false; +} + static bool svm_has_wbinvd_exit(void) { return true; @@ -4371,6 +4376,7 @@ static struct kvm_x86_ops svm_x86_ops = { .rdtscp_supported = svm_rdtscp_supported, .invpcid_supported = svm_invpcid_supported, + .mpx_supported = svm_mpx_supported, .set_supported_cpuid = svm_set_supported_cpuid, |