KVM: Flush remote tlbs when reducing shadow pte permissions

When a vcpu causes a shadow tlb entry to have reduced permissions, it
must also clear the tlb on remote vcpus.  We do that by:

- setting a bit on the vcpu that requests a tlb flush before the next entry
- if the vcpu is currently executing, we send an ipi to make sure it
  exits before we continue

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 528a56b1790e..b08272bce213 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -84,6 +84,11 @@
 #define KVM_PIO_PAGE_OFFSET 1
 
 /*
+ * vcpu->requests bit members
+ */
+#define KVM_TLB_FLUSH 0
+
+/*
  * Address types:
  *
  *  gva - guest virtual address
@@ -272,6 +277,8 @@ struct kvm_vcpu {
         u64 host_tsc;
         struct kvm_run *run;
         int interrupt_window_open;
+        int guest_mode;
+        unsigned long requests;
         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 #define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
         unsigned long irq_pending[NR_IRQ_WORDS];
@@ -530,6 +537,7 @@ void save_msrs(struct vmx_msr_entry *e, int n);
 void kvm_resched(struct kvm_vcpu *vcpu);
 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
+void kvm_flush_remote_tlbs(struct kvm *kvm);
 
 int kvm_read_guest(struct kvm_vcpu *vcpu,
                gva_t addr,