KVM: Add mmu cache clear function

Functions that play around with the physical memory map
need a way to clear mappings to possibly nonexistent or
invalid memory.  Both the mmu cache and the processor tlb
are cleared.

Signed-off-by: Dor Laor <dor.laor@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 6d0bd7a..59357be 100644 (file)
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -430,6 +430,7 @@ int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 
 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
+void kvm_mmu_zap_all(struct kvm_vcpu *vcpu);
 
 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index d81b9cd..376800a 100644 (file)
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -1314,6 +1314,23 @@ void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot)
        }
 }
 
+void kvm_mmu_zap_all(struct kvm_vcpu *vcpu)
+{
+       destroy_kvm_mmu(vcpu);
+
+       while (!list_empty(&vcpu->kvm->active_mmu_pages)) {
+               struct kvm_mmu_page *page;
+
+               page = container_of(vcpu->kvm->active_mmu_pages.next,
+                                   struct kvm_mmu_page, link);
+               kvm_mmu_zap_page(vcpu, page);
+       }
+
+       mmu_free_memory_caches(vcpu);
+       kvm_arch_ops->tlb_flush(vcpu);
+       init_kvm_mmu(vcpu);
+}
+
 #ifdef AUDIT
 
 static const char *audit_msg;