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KVM: MMU: introduce kvm_mmu_slot_gfn_write_protect

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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: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiao Guangrong 2016-02-24 17:51:08 +08:00 committed by Paolo Bonzini
parent 547ffaed87
commit aeecee2ea6
2 changed files with 13 additions and 5 deletions
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16
arch/x86/kvm/mmu.c
View File

@ -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;

2
arch/x86/kvm/mmu.h
View File

@ -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