Commit 37e9d1a9 authored by Bibo Mao's avatar Bibo Mao Committed by Huacai Chen
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LoongArch: KVM: Set page with write attribute if dirty track disabled 



With secondary MMU page table, if there is a read page fault, the page's
write attribute will not set even if it is writable from master MMU page
table. This logic only works if dirty tracking is enabled, so page table
should be set with _PAGE_WRITE if dirty tracking is disabled.

It reduces extra page fault on secondary MMU page table if a VM finishes
migration, when the master MMU page table is ready and the secondary MMU
page is fresh.

Signed-off-by: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 62cda5e5

arch/loongarch/kvm/mmu.c

+1 −1
Original line number Diff line number Diff line
@@ -857,7 +857,7 @@ static int kvm_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, bool write) 


	if (writeable) {

		prot_bits = kvm_pte_mkwriteable(prot_bits);

		if (write)

		if (write || !kvm_slot_dirty_track_enabled(memslot))

			prot_bits = kvm_pte_mkdirty(prot_bits);

	}