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From: Lai Jiangshan <jiangshanlai@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: kvm@vger.kernel.org, Lai Jiangshan <laijs@linux.alibaba.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH 16/15] KVM: X86: Update mmu->pdptrs only when it is changed
Date: Thu, 11 Nov 2021 22:45:26 +0800	[thread overview]
Message-ID: <20211111144527.88852-1-jiangshanlai@gmail.com> (raw)
In-Reply-To: <20211108124407.12187-1-jiangshanlai@gmail.com>

From: Lai Jiangshan <laijs@linux.alibaba.com>

It is unchanged in most cases.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
---
 arch/x86/kvm/x86.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6ca19cac4aff..0176eaa86a35 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -828,10 +828,13 @@ int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
 		}
 	}
 
-	memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
-	kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR);
-	/* Ensure the dirty PDPTEs to be loaded. */
-	kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu);
+	kvm_register_mark_available(vcpu, VCPU_EXREG_PDPTR);
+	if (memcmp(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs))) {
+		memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
+		kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR);
+		/* Ensure the dirty PDPTEs to be loaded. */
+		kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu);
+	}
 	vcpu->arch.pdptrs_from_userspace = false;
 
 	return 1;
-- 
2.19.1.6.gb485710b


  parent reply	other threads:[~2021-11-11 14:45 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-08 12:43 [PATCH 00/15] KVM: X86: Fix and clean up for register caches Lai Jiangshan
2021-11-08 12:43 ` [PATCH 01/15] KVM: X86: Ensure the dirty PDPTEs to be loaded Lai Jiangshan
2021-11-08 12:43 ` [PATCH 02/15] KVM: VMX: Mark VCPU_EXREG_PDPTR available in ept_save_pdptrs() Lai Jiangshan
2021-11-08 12:43 ` [PATCH 03/15] KVM: SVM: Always clear available of VCPU_EXREG_PDPTR in svm_vcpu_run() Lai Jiangshan
2021-11-08 12:43 ` [PATCH 04/15] KVM: VMX: Add and use X86_CR4_TLB_BITS when !enable_ept Lai Jiangshan
2021-11-18 15:18   ` Paolo Bonzini
2021-11-08 12:43 ` [PATCH 05/15] KVM: VMX: Add and use X86_CR4_PDPTR_BITS " Lai Jiangshan
2021-11-08 12:43 ` [PATCH 06/15] KVM: X86: Move CR0 pdptr_bits into header file as X86_CR0_PDPTR_BITS Lai Jiangshan
2021-11-08 12:43 ` [PATCH 07/15] KVM: SVM: Remove outdated comment in svm_load_mmu_pgd() Lai Jiangshan
2021-11-08 12:44 ` [PATCH 08/15] KVM: SVM: Remove useless check " Lai Jiangshan
2021-11-08 12:44 ` [PATCH 09/15] KVM: SVM: Remove the unneeded code to mark available for CR3 Lai Jiangshan
2021-11-18 15:17   ` Paolo Bonzini
2021-11-08 12:44 ` [PATCH 10/15] KVM: X86: Mark CR3 dirty when vcpu->arch.cr3 is changed Lai Jiangshan
2021-11-08 12:44 ` [PATCH 11/15] KVM: VMX: Update vmcs.GUEST_CR3 only when the guest CR3 is dirty Lai Jiangshan
2021-12-15 15:47   ` Maxim Levitsky
2021-12-15 16:31     ` Lai Jiangshan
2021-12-15 16:43       ` Lai Jiangshan
2021-12-15 16:45       ` Sean Christopherson
2021-12-15 17:10         ` Paolo Bonzini
2021-12-15 20:21         ` Maxim Levitsky
2021-12-15 20:20       ` Maxim Levitsky
2021-11-08 12:44 ` [PATCH 12/15] KVM: VMX: Reset the bits that are meaningful to be reset in vmx_register_cache_reset() Lai Jiangshan
2021-11-18 15:25   ` Paolo Bonzini
2021-11-08 12:44 ` [PATCH 13/15] KVM: SVM: Add and use svm_register_cache_reset() Lai Jiangshan
2021-11-18 15:37   ` Paolo Bonzini
2021-11-18 16:28     ` Lai Jiangshan
2021-11-18 17:54       ` Paolo Bonzini
2021-11-19  0:49         ` Lai Jiangshan
2021-11-08 12:44 ` [PATCH 14/15] KVM: X86: Remove kvm_register_clear_available() Lai Jiangshan
2021-11-08 12:44 ` [PATCH 15/15] KVM: nVMX: Always write vmcs.GUEST_CR3 during nested VM-Exit Lai Jiangshan
2021-11-18 15:52   ` Paolo Bonzini
2021-11-11 14:45 ` Lai Jiangshan [this message]
2021-12-07 23:43   ` [PATCH 16/15] KVM: X86: Update mmu->pdptrs only when it is changed Sean Christopherson
2021-12-08  3:29     ` Lai Jiangshan
2021-12-08  9:09     ` Paolo Bonzini
2021-12-08  9:34       ` Lai Jiangshan
2021-11-11 14:46 ` [PATCH 17/15] KVM: X86: Ensure pae_root to be reconstructed for shadow paging if the guest PDPTEs " Lai Jiangshan
2021-11-23  9:34   ` Lai Jiangshan
2021-12-08  0:15   ` Sean Christopherson
2021-12-08  4:00     ` Lai Jiangshan
2021-12-08 15:29       ` Sean Christopherson
2021-12-09 22:46     ` Paolo Bonzini
2021-12-10 21:07       ` Sean Christopherson
2021-12-10 21:08         ` Sean Christopherson
2021-12-11  6:56         ` Maxim Levitsky
2021-12-11  8:22           ` Paolo Bonzini
2021-12-13 16:54             ` Sean Christopherson
2021-11-18  8:53 ` [PATCH 00/15] KVM: X86: Fix and clean up for register caches Lai Jiangshan

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