[Patch 5/6] kvm: x86: Add IA32_XSS to the emulated_msrs list

Aaron Lewis
2019-10-09T00:42:12Z

Add IA32_XSS to the list of emulated MSRs if it is supported in the
guest.

Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
---
arch/x86/kvm/svm.c | 12 +++++++-----
arch/x86/kvm/vmx/vmx.c | 2 ++
arch/x86/kvm/x86.c | 1 +
3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2522a467bbc0..8de6705ac30d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -498,6 +498,11 @@ static inline bool avic_vcpu_is_running(struct kvm_vcpu *vcpu)
return (READ_ONCE(*entry) & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK);
}

+static bool svm_xsaves_supported(void)
+{
+ return boot_cpu_has(X86_FEATURE_XSAVES);
+}
+
static void recalc_intercepts(struct vcpu_svm *svm)
{
struct vmcb_control_area *c, *h;
@@ -5871,6 +5876,8 @@ static bool svm_has_emulated_msr(int index)
case MSR_IA32_MCG_EXT_CTL:
case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
return false;
+ case MSR_IA32_XSS:
+ return svm_xsaves_supported();
default:
break;
}
@@ -5964,11 +5971,6 @@ static bool svm_mpx_supported(void)
return false;
}

-static bool svm_xsaves_supported(void)
-{
- return boot_cpu_has(X86_FEATURE_XSAVES);
-}
-
static bool svm_umip_emulated(void)
{
return false;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index bd4ce33bd52f..c28461385c2b 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6270,6 +6270,8 @@ static bool vmx_has_emulated_msr(int index)
case MSR_AMD64_VIRT_SPEC_CTRL:
/* This is AMD only. */
return false;
+ case MSR_IA32_XSS:
+ return vmx_xsaves_supported();
default:
return true;
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 77f2e8c05047..243c6df12d81 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1229,6 +1229,7 @@ static u32 emulated_msrs[] = {
MSR_MISC_FEATURES_ENABLES,
MSR_AMD64_VIRT_SPEC_CTRL,
MSR_IA32_POWER_CTL,
+ MSR_IA32_XSS,

/*
* The following list leaves out MSRs whose values are determined
--
2.23.0.581.g78d2f28ef7-goog