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KVM: VMX: Refresh list of user return MSRs after setting guest CPUID

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After a CPUID update, refresh the list of user return MSRs that are
loaded into hardware when running the vCPU.  This is necessary to handle
the oddball case where userspace exposes X86_FEATURE_RDTSCP to the guest
after the vCPU is running.

Fixes: 0023ef39dc ("kvm: vmx: Set IA32_TSC_AUX for legacy mode guests")
Fixes: 4e47c7a6d7 ("KVM: VMX: Add instruction rdtscp support for guest")
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210713163324.627647-35-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-07-13 09:33:12 -07:00 committed by Paolo Bonzini
parent 400dd54b37
commit 432979b503
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/vmx/vmx.c
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@ -7170,6 +7170,8 @@ static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
/* xsaves_enabled is recomputed in vmx_compute_secondary_exec_control(). */
vcpu->arch.xsaves_enabled = false;
vmx_setup_uret_msrs(vmx);
if (cpu_has_secondary_exec_ctrls()) {
vmx_compute_secondary_exec_control(vmx);
vmcs_set_secondary_exec_control(vmx);