diff options
| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-10-07 04:44:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-21 16:16:21 +0300 |
| commit | da7f731f2ed5b4a082567967ce74be274aab2daf (patch) | |
| tree | 45f2ae5d430939ce3dfdc394ee714dd4a494a1c0 | |
| parent | 8b8b376903b32d3d854f39eeebe018169c920cb6 (diff) | |
| download | linux-da7f731f2ed5b4a082567967ce74be274aab2daf.tar.xz | |
KVM: VMX: Drop explicit 'nested' check from vmx_set_cr4()
[ Upstream commit a447e38a7fadb2e554c3942dda183e55cccd5df0 ]
Drop vmx_set_cr4()'s explicit check on the 'nested' module param now
that common x86 handles the check by incorporating VMXE into the CR4
reserved bits, via kvm_cpu_caps. X86_FEATURE_VMX is set in kvm_cpu_caps
(by vmx_set_cpu_caps()), if and only if 'nested' is true.
No functional change intended.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20201007014417.29276-3-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 1b75847d8a49..154ec5d8cdf5 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -3211,18 +3211,13 @@ int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) } } - if (cr4 & X86_CR4_VMXE) { - /* - * To use VMXON (and later other VMX instructions), a guest - * must first be able to turn on cr4.VMXE (see handle_vmon()). - * So basically the check on whether to allow nested VMX - * is here. We operate under the default treatment of SMM, - * so VMX cannot be enabled under SMM. Note, guest CPUID is - * intentionally ignored, it's handled by cr4_guest_rsvd_bits. - */ - if (!nested || is_smm(vcpu)) - return 1; - } + /* + * We operate under the default treatment of SMM, so VMX cannot be + * enabled under SMM. Note, whether or not VMXE is allowed at all is + * handled by kvm_valid_cr4(). + */ + if ((cr4 & X86_CR4_VMXE) && is_smm(vcpu)) + return 1; if (vmx->nested.vmxon && !nested_cr4_valid(vcpu, cr4)) return 1; |