[PATCH 37/41] KVM: Add mmu cache clear function

Avi Kivity
2007-04-01T14:35:34Z

From: Dor Laor <dor.laor-atKUWr5tajBWk0Htik3J/w@public.gmane.org>

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-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Signed-off-by: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
---
drivers/kvm/kvm.h | 1 +
drivers/kvm/mmu.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 6d0bd7a..59357be 100644
--- 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 c2487b6..707f63c 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -1313,6 +1313,23 @@ 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;