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

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It is unchanged in most cases.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211111144527.88852-1-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lai Jiangshan 2021-11-11 22:45:26 +08:00 committed by Paolo Bonzini
parent 2e9ebd5509
commit 24cd19a28c
1 changed files with 6 additions and 3 deletions
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3
arch/x86/kvm/x86.c
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@ -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)); memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR); kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR);
kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu); kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu);
}
vcpu->arch.pdptrs_from_userspace = false; vcpu->arch.pdptrs_from_userspace = false;
return 1; return 1;