[PATCH v3 08/10] KVM: MMU: introduce kvm_zap_gfn_range

Xiao Guangrong
2015-05-13T06:47:26Z

It is used to zap all the rmaps of the specified gfn range and will
be used by the later patch

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
---
arch/x86/kvm/mmu.c | 24 ++++++++++++++++++++++++
arch/x86/kvm/mmu.h | 1 +
2 files changed, 25 insertions(+)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index a990ad9..49c34e6 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4526,6 +4526,30 @@ slot_handle_leaf(struct kvm *kvm, struct kvm_memory_slot *memslot,
PT_PAGE_TABLE_LEVEL, lock_flush_tlb);
}

+void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
+{
+ struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
+
+ slots = kvm_memslots(kvm);
+
+ spin_lock(&kvm->mmu_lock);
+ kvm_for_each_memslot(memslot, slots) {
+ gfn_t start, end;
+
+ start = max(gfn_start, memslot->base_gfn);
+ end = min(gfn_end, memslot->base_gfn + memslot->npages);
+ if (start >= end)
+ continue;
+
+ slot_handle_level_range(kvm, memslot, kvm_zap_rmapp,
+ PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL,
+ start, end - 1, true);
+ }
+
+ spin_unlock(&kvm->mmu_lock);
+}
+
static bool slot_rmap_write_protect(struct kvm *kvm, unsigned long *rmapp)
{
return __rmap_write_protect(kvm, rmapp, false);
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 72bb33f..398d21c 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -171,4 +171,5 @@ static inline bool permission_fault(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
}

void kvm_mmu_invalidate_zap_all_pages(struct kvm *kvm);
+void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end);
#endif
--
2.1.0