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Date: Sat, 24 Feb 2018 01:52:26 +0100 From: Paolo Bonzini <pbonzini@...hat.com> To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org Cc: David Woodhouse <dwmw@...zon.co.uk>, KarimAllah Ahmed <karahmed@...zon.de> Subject: [PATCH] KVM: VMX: expose the host's ARCH_CAPABILITIES MSR to userspace Use the new MSR feature framework to expose the ARCH_CAPABILITIES MSR to userspace. This way, userspace can access the capabilities even if it does not have the permissions to read MSRs. Signed-off-by: Paolo Bonzini <pbonzini@...hat.com> --- arch/x86/kvm/vmx.c | 12 +++++++++++- arch/x86/kvm/x86.c | 1 + 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 130fca0ea1bf..99689061e11e 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3228,7 +3228,17 @@ static inline bool vmx_feature_control_msr_valid(struct kvm_vcpu *vcpu, static int vmx_get_msr_feature(struct kvm_msr_entry *msr) { - return 1; + switch (msr->index) { + case MSR_IA32_ARCH_CAPABILITIES: + if (!boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES)) + return 1; + rdmsrl(msr->index, msr->data); + break; + default: + return 1; + } + + return 0; } /* diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 54b4ed55945b..e9a8cc9e3b2b 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1054,6 +1054,7 @@ bool kvm_rdpmc(struct kvm_vcpu *vcpu) * can be used by a hypervisor to validate requested CPU features. */ static u32 msr_based_features[] = { + MSR_IA32_ARCH_CAPABILITIES, MSR_F10H_DECFG, }; -- 1.8.3.1
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