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| author |   Paolo Bonzini <pbonzini@redhat.com> | 2017-08-24 14:48:03 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-08-24 18:09:13 +0200 |
| commit | 3db134805c69aae16ba6193946aa8deccd393ead (patch) | |
| tree | e9cb104b81f6b3f3c9d2a1a22e3151bf7f133264 /arch/x86/kvm/vmx.c | |
| parent | kvm: vmx: Raise #UD on unsupported RDSEED (diff) | |
| download | linux-dev-3db134805c69aae16ba6193946aa8deccd393ead.tar.xz linux-dev-3db134805c69aae16ba6193946aa8deccd393ead.zip | |
kvm: vmx: Raise #UD on unsupported XSAVES/XRSTORS
A guest may not be configured to support XSAVES/XRSTORS, even when the host
does. If the guest does not support XSAVES/XRSTORS, clear the secondary
execution control so that the processor will raise #UD.
Also clear the "allowed-1" bit for XSAVES/XRSTORS exiting in the
IA32_VMX_PROCBASED_CTLS2 MSR, and pass through VMCS12's control in
the VMCS02.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 954e26079cd6..08bfeb8c32ea 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1358,8 +1358,7 @@ static inline int nested_cpu_has_ept(struct vmcs12 *vmcs12) static inline bool nested_cpu_has_xsaves(struct vmcs12 *vmcs12) { - return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES) && - vmx_xsaves_supported(); + return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES); } static inline bool nested_cpu_has_pml(struct vmcs12 *vmcs12) @@ -2823,8 +2822,7 @@ static void nested_vmx_setup_ctls_msrs(struct vcpu_vmx *vmx) SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | SECONDARY_EXEC_APIC_REGISTER_VIRT | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | - SECONDARY_EXEC_WBINVD_EXITING | - SECONDARY_EXEC_XSAVES; + SECONDARY_EXEC_WBINVD_EXITING; if (enable_ept) { /* nested EPT: emulate EPT also to L1 */ @@ -5319,6 +5317,25 @@ static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx) if (!enable_pml) exec_control &= ~SECONDARY_EXEC_ENABLE_PML; + if (vmx_xsaves_supported()) { + /* Exposing XSAVES only when XSAVE is exposed */ + bool xsaves_enabled = + guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && + guest_cpuid_has(vcpu, X86_FEATURE_XSAVES); + + if (!xsaves_enabled) + exec_control &= ~SECONDARY_EXEC_XSAVES; + + if (nested) { + if (xsaves_enabled) + vmx->nested.nested_vmx_secondary_ctls_high |= + SECONDARY_EXEC_XSAVES; + else + vmx->nested.nested_vmx_secondary_ctls_high &= + ~SECONDARY_EXEC_XSAVES; + } + } + if (vmx_rdtscp_supported()) { bool rdtscp_enabled = guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP); if (!rdtscp_enabled) @@ -10421,6 +10438,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | SECONDARY_EXEC_ENABLE_INVPCID | SECONDARY_EXEC_RDTSCP | + SECONDARY_EXEC_XSAVES | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | SECONDARY_EXEC_APIC_REGISTER_VIRT | SECONDARY_EXEC_ENABLE_VMFUNC); |