From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH] KVM: x86: Make CR4.VMXE reserved for the guest
Date: Wed, 8 Jul 2020 07:03:50 -0400 [thread overview]
Message-ID: <20200708110350.848997-1-pbonzini@redhat.com> (raw)
CR4.VMXE is reserved unless the VMX CPUID bit is set. On Intel,
it is also tested by vmx_set_cr4, but AMD relies on kvm_valid_cr4,
so fix it.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/x86.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 56975c6c1e15..224670d7c245 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -392,6 +392,8 @@ bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu);
__reserved_bits |= X86_CR4_LA57; \
if (!__cpu_has(__c, X86_FEATURE_UMIP)) \
__reserved_bits |= X86_CR4_UMIP; \
+ if (!__cpu_has(__c, X86_FEATURE_VMX)) \
+ __reserved_bits |= X86_CR4_VMXE; \
__reserved_bits; \
})
--
2.26.2
next reply other threads:[~2020-07-08 11:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-08 11:03 Paolo Bonzini [this message]
2020-07-08 18:19 ` [PATCH] KVM: x86: Make CR4.VMXE reserved for the guest Jim Mattson
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