linux-kernel - [PATCH 4/8] KVM: SVM: use __GFP_ZERO instead of clear

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Date:   Thu, 27 Aug 2020 20:04:30 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...en8.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH 4/8] KVM: SVM: use __GFP_ZERO instead of clear_page

Another small refactoring.

Suggested-by: Jim Mattson <jmattson@...gle.com>
Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/svm/svm.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index ddbb05614af4f..290b2d0cd78e3 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1190,11 +1190,11 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
 	svm = to_svm(vcpu);
 
 	err = -ENOMEM;
-	vmcb_page = alloc_page(GFP_KERNEL_ACCOUNT);
+	vmcb_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
 	if (!vmcb_page)
 		goto out;
 
-	hsave_page = alloc_page(GFP_KERNEL_ACCOUNT);
+	hsave_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
 	if (!hsave_page)
 		goto free_page1;
 
@@ -1209,7 +1209,6 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
 		svm->avic_is_running = true;
 
 	svm->nested.hsave = page_address(hsave_page);
-	clear_page(svm->nested.hsave);
 
 	svm->msrpm = svm_vcpu_init_msrpm();
 	if (!svm->msrpm)
@@ -1220,7 +1219,6 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
 		goto free_page3;
 
 	svm->vmcb = page_address(vmcb_page);
-	clear_page(svm->vmcb);
 	svm->vmcb_pa = __sme_set(page_to_pfn(vmcb_page) << PAGE_SHIFT);
 	svm->asid_generation = 0;
 	init_vmcb(svm);
-- 
2.26.2