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KVM: VMX: enable X86_FEATURE_WAITPKG in KVM capabilities

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Even though we might not allow the guest to use WAITPKG's new
instructions, we should tell KVM that the feature is supported by the
host CPU.

Note that vmx_waitpkg_supported checks that WAITPKG _can_ be set in
secondary execution controls as specified by VMX capability MSR, rather
that we actually enable it for a guest.

Cc: stable@vger.kernel.org
Fixes: e69e72faa3 ("KVM: x86: Add support for user wait instructions")
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20200523161455.3940-2-mlevitsk@redhat.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2020-05-23 19:14:54 +03:00 committed by Paolo Bonzini
parent 6129ed877d
commit 0abcc8f65c
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/vmx/vmx.c
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@ -7138,6 +7138,9 @@ static __init void vmx_set_cpu_caps(void)
/* CPUID 0x80000001 */
if (!cpu_has_vmx_rdtscp())
kvm_cpu_cap_clear(X86_FEATURE_RDTSCP);
if (vmx_waitpkg_supported())
kvm_cpu_cap_check_and_set(X86_FEATURE_WAITPKG);
}
static void vmx_request_immediate_exit(struct kvm_vcpu *vcpu)