linux-kernel - [PATCH v2 6/7] KVM: nVMX: Drop redundant VMCS switch and free

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Message-Id: <20200923184452.980-7-sean.j.christopherson@intel.com>
Date:   Wed, 23 Sep 2020 11:44:51 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Dan Cross <dcross@...gle.com>,
        Peter Shier <pshier@...gle.com>
Subject: [PATCH v2 6/7] KVM: nVMX: Drop redundant VMCS switch and free_nested() call

Remove the explicit switch to vmcs01 and the call to free_nested() in
nested_vmx_free_vcpu().  free_nested(), which is called unconditionally
by vmx_leave_nested(), ensures vmcs01 is loaded prior to freeing vmcs02
and friends.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/vmx/nested.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 3e6cc0d7090e..63550dcf6b9f 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -326,8 +326,6 @@ void nested_vmx_free_vcpu(struct kvm_vcpu *vcpu)
 {
 	vcpu_load(vcpu);
 	vmx_leave_nested(vcpu);
-	vmx_switch_vmcs(vcpu, &to_vmx(vcpu)->vmcs01);
-	free_nested(vcpu);
 	vcpu_put(vcpu);
 }
 
-- 
2.28.0