Commit 24cd19a2 authored by Lai Jiangshan's avatar Lai Jiangshan Committed by Paolo Bonzini
Browse files

KVM: X86: Update mmu->pdptrs only when it is changed 



It is unchanged in most cases.

Signed-off-by: default avatarLai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211111144527.88852-1-jiangshanlai@gmail.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 2e9ebd55

arch/x86/kvm/x86.c

+6 −3
Original line number Diff line number Diff line
@@ -828,9 +828,12 @@ int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3) 
		}

	}



	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);

		kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu);

	}

	vcpu->arch.pdptrs_from_userspace = false;



	return 1;