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Commit 01c168ac authored by Gui Jianfeng's avatar Gui Jianfeng Committed by Avi Kivity
Browse files

KVM: MMU: don't check PT_WRITABLE_MASK directly 



Since we have is_writable_pte(), make use of it.

Signed-off-by: default avatarGui Jianfeng <guijianfeng@cn.fujitsu.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 3af1817a

arch/x86/kvm/mmu.c

+4 −4
Original line number Diff line number Diff line
@@ -2990,7 +2990,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) 
		pt = sp->spt;

		for (i = 0; i < PT64_ENT_PER_PAGE; ++i)

			/* avoid RMW */

			if (pt[i] & PT_WRITABLE_MASK)

			if (is_writable_pte(pt[i]))

				pt[i] &= ~PT_WRITABLE_MASK;

	}

	kvm_flush_remote_tlbs(kvm);
@@ -3425,7 +3425,7 @@ void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep) 
	struct kvm_mmu_page *rev_sp;

	gfn_t gfn;



	if (*sptep & PT_WRITABLE_MASK) {

	if (is_writable_pte(*sptep)) {

		rev_sp = page_header(__pa(sptep));

		gfn = kvm_mmu_page_get_gfn(rev_sp, sptep - rev_sp->spt);
@@ -3474,7 +3474,7 @@ static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu) 


			if (!(ent & PT_PRESENT_MASK))

				continue;

			if (!(ent & PT_WRITABLE_MASK))

			if (!is_writable_pte(ent))

				continue;

			inspect_spte_has_rmap(vcpu->kvm, &pt[i]);

		}
@@ -3508,7 +3508,7 @@ static void audit_write_protection(struct kvm_vcpu *vcpu) 


		spte = rmap_next(vcpu->kvm, rmapp, NULL);

		while (spte) {

			if (*spte & PT_WRITABLE_MASK)

			if (is_writable_pte(*spte))

				printk(KERN_ERR "%s: (%s) shadow page has "

				"writable mappings: gfn %lx role %x\n",

			       __func__, audit_msg, sp->gfn,