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Subject[PATCH 4.17 01/66] KVM: VMX: support MSR_IA32_ARCH_CAPABILITIES as a feature MSR
Date
4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paolo Bonzini <pbonzini@redhat.com>

commit cd28325249a1ca0d771557ce823e0308ad629f98 upstream.

This lets userspace read the MSR_IA32_ARCH_CAPABILITIES and check that all
requested features are available on the host.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/kvm/x86.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1092,6 +1092,7 @@ static u32 msr_based_features[] = {

MSR_F10H_DECFG,
MSR_IA32_UCODE_REV,
+ MSR_IA32_ARCH_CAPABILITIES,
};

static unsigned int num_msr_based_features;
@@ -1100,7 +1101,8 @@ static int kvm_get_msr_feature(struct kv
{
switch (msr->index) {
case MSR_IA32_UCODE_REV:
- rdmsrl(msr->index, msr->data);
+ case MSR_IA32_ARCH_CAPABILITIES:
+ rdmsrl_safe(msr->index, &msr->data);
break;
default:
if (kvm_x86_ops->get_msr_feature(msr))

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