linux-kernel - [PATCH v2 09/46] KVM: SVM: Drop a redundant init_vmcb() from svm_create

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Date:   Tue, 13 Jul 2021 09:32:47 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.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, Reiji Watanabe <reijiw@...gle.com>
Subject: [PATCH v2 09/46] KVM: SVM: Drop a redundant init_vmcb() from svm_create_vcpu()

Drop an extra init_vmcb() from svm_create_vcpu(), svm_vcpu_reset() is
guaranteed to call init_vmcb() and there are no consumers of the VMCB
data between ->vcpu_create() and ->vcpu_reset().  Keep the call to
svm_switch_vmcb() as sev_es_create_vcpu() touches the current VMCB, but
hoist it up a few lines to associate the switch with the allocation of
vmcb01.

Reviewed-by: Reiji Watanabe <reijiw@...gle.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/svm.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 44248548be7d..cef9520fe77f 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1431,15 +1431,13 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
 
 	svm->vmcb01.ptr = page_address(vmcb01_page);
 	svm->vmcb01.pa = __sme_set(page_to_pfn(vmcb01_page) << PAGE_SHIFT);
+	svm_switch_vmcb(svm, &svm->vmcb01);
 
 	if (vmsa_page)
 		svm->vmsa = page_address(vmsa_page);
 
 	svm->guest_state_loaded = false;
 
-	svm_switch_vmcb(svm, &svm->vmcb01);
-	init_vmcb(vcpu);
-
 	svm_init_osvw(vcpu);
 	vcpu->arch.microcode_version = 0x01000065;
 
-- 
2.32.0.93.g670b81a890-goog