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[v13,23/85] KVM: nVMX: Rely on kvm_vcpu_unmap() to track validity of eVMCS mapping

Message ID 20241010182427.1434605-24-seanjc@google.com
State Accepted
Headers show
Series KVM: Stop grabbing references to PFNMAP'd pages | expand

Commit Message

Sean Christopherson Oct. 10, 2024, 6:23 p.m. UTC 
Remove the explicit evmptr12 validity check when deciding whether or not
to unmap the eVMCS pointer, and instead rely on kvm_vcpu_unmap() to play
nice with a NULL map->hva, i.e. to do nothing if the map is invalid.

Note, vmx->nested.hv_evmcs_map is zero-allocated along with the rest of
vcpu_vmx, i.e. the map starts out invalid/NULL.

Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/vmx/nested.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
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Patch

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index a8e7bc04d9bf..e94a25373a59 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -231,11 +231,8 @@  static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 
-	if (nested_vmx_is_evmptr12_valid(vmx)) {
-		kvm_vcpu_unmap(vcpu, &vmx->nested.hv_evmcs_map, true);
-		vmx->nested.hv_evmcs = NULL;
-	}
-
+	kvm_vcpu_unmap(vcpu, &vmx->nested.hv_evmcs_map, true);
+	vmx->nested.hv_evmcs = NULL;
 	vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID;
 
 	if (hv_vcpu) {