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Commit aeecee2e authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Paolo Bonzini
Browse files

KVM: MMU: introduce kvm_mmu_slot_gfn_write_protect 



Split rmap_write_protect() and introduce the function to abstract the write
protection based on the slot

This function will be used in the later patch

Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 547ffaed

arch/x86/kvm/mmu.c

+11 −5
Original line number Diff line number Diff line
@@ -1336,23 +1336,29 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm, 
		kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask);

}



static bool rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn)

bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,

				    struct kvm_memory_slot *slot, u64 gfn)

{

	struct kvm_memory_slot *slot;

	struct kvm_rmap_head *rmap_head;

	int i;

	bool write_protected = false;



	slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);



	for (i = PT_PAGE_TABLE_LEVEL; i <= PT_MAX_HUGEPAGE_LEVEL; ++i) {

		rmap_head = __gfn_to_rmap(gfn, i, slot);

		write_protected |= __rmap_write_protect(vcpu->kvm, rmap_head, true);

		write_protected |= __rmap_write_protect(kvm, rmap_head, true);

	}



	return write_protected;

}



static bool rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn)

{

	struct kvm_memory_slot *slot;



	slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);

	return kvm_mmu_slot_gfn_write_protect(vcpu->kvm, slot, gfn);

}



static bool kvm_zap_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head)

{

	u64 *sptep;

arch/x86/kvm/mmu.h

+2 −0
Original line number Diff line number Diff line
@@ -177,4 +177,6 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end); 


void kvm_mmu_gfn_disallow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);

void kvm_mmu_gfn_allow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);

bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,

				    struct kvm_memory_slot *slot, u64 gfn);

#endif