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authorAvi Kivity <avi@qumranet.com>2007-06-07 19:18:30 +0300
committerAvi Kivity <avi@qumranet.com>2007-07-16 12:05:46 +0300
commitd9e368d61263055eceac2966bb7ea31b89da3425 (patch)
tree9d507b851ea7bd667cdd50dde640e47e0d4773e9 /drivers/kvm/svm.c
parent39c3b86e5c193e09f69f0e99c93600a4999ffc60 (diff)
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>
Diffstat (limited to 'drivers/kvm/svm.c')
-rw-r--r--drivers/kvm/svm.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index 70f386e04cb..eb175c5cd49 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -1470,6 +1470,11 @@ static void load_db_regs(unsigned long *db_regs)
asm volatile ("mov %0, %%dr3" : : "r"(db_regs[3]));
}
+static void svm_flush_tlb(struct kvm_vcpu *vcpu)
+{
+ force_new_asid(vcpu);
+}
+
static int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
u16 fs_selector;
@@ -1487,6 +1492,11 @@ again:
clgi();
+ vcpu->guest_mode = 1;
+ if (vcpu->requests)
+ if (test_and_clear_bit(KVM_TLB_FLUSH, &vcpu->requests))
+ svm_flush_tlb(vcpu);
+
pre_svm_run(vcpu);
save_host_msrs(vcpu);
@@ -1618,6 +1628,8 @@ again:
#endif
: "cc", "memory" );
+ vcpu->guest_mode = 0;
+
if (vcpu->fpu_active) {
fx_save(vcpu->guest_fx_image);
fx_restore(vcpu->host_fx_image);
@@ -1682,11 +1694,6 @@ again:
return r;
}
-static void svm_flush_tlb(struct kvm_vcpu *vcpu)
-{
- force_new_asid(vcpu);
-}
-
static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
vcpu->svm->vmcb->save.cr3 = root;