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Diffstat (limited to 'drivers/kvm')
-rw-r--r--drivers/kvm/kvm.h1
-rw-r--r--drivers/kvm/kvm_main.c16
2 files changed, 14 insertions, 3 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index f99e89e185b..41634fde8e1 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -310,6 +310,7 @@ struct kvm_vcpu {
int mmio_size;
unsigned char mmio_data[8];
gpa_t mmio_phys_addr;
+ gva_t mmio_fault_cr2;
struct kvm_pio_request pio;
void *pio_data;
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index cdf0b176851..f267dbb5284 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1186,6 +1186,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
int r;
int cs_db, cs_l;
+ vcpu->mmio_fault_cr2 = cr2;
kvm_arch_ops->cache_regs(vcpu);
kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
@@ -1804,14 +1805,23 @@ static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
r = complete_pio(vcpu);
if (r)
goto out;
- } else {
+ } else if (!vcpu->mmio_is_write) {
memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
vcpu->mmio_read_completed = 1;
+ vcpu->mmio_needed = 0;
+ r = emulate_instruction(vcpu, kvm_run,
+ vcpu->mmio_fault_cr2, 0);
+ if (r == EMULATE_DO_MMIO) {
+ /*
+ * Read-modify-write. Back to userspace.
+ */
+ kvm_run->exit_reason = KVM_EXIT_MMIO;
+ r = 0;
+ goto out;
+ }
}
}
- vcpu->mmio_needed = 0;
-
if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
kvm_arch_ops->cache_regs(vcpu);
vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;