KVM: VMX: Read & store IDT_VECTORING_INFO_FIELD
We'll want to write to it in order to fix real-mode irq injection problems,
but it is a read-only field. Storing it in a variable solves that issue.
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index d2c25e2..f045f40 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -48,6 +48,7 @@
struct kvm_vcpu vcpu;
int launched;
u8 fail;
+ u32 idt_vectoring_info;
struct kvm_msr_entry *guest_msrs;
struct kvm_msr_entry *host_msrs;
int nmsrs;
@@ -863,9 +864,10 @@
static int vmx_get_irq(struct kvm_vcpu *vcpu)
{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 idtv_info_field;
- idtv_info_field = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+ idtv_info_field = vmx->idt_vectoring_info;
if (idtv_info_field & INTR_INFO_VALID_MASK) {
if (is_external_interrupt(idtv_info_field))
return idtv_info_field & VECTORING_INFO_VECTOR_MASK;
@@ -1817,12 +1819,13 @@
static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 intr_info, error_code;
unsigned long cr2, rip;
u32 vect_info;
enum emulation_result er;
- vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+ vect_info = vmx->idt_vectoring_info;
intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
if ((vect_info & VECTORING_INFO_VALID_MASK) &&
@@ -2171,9 +2174,9 @@
*/
static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
- u32 vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 vectoring_info = vmx->idt_vectoring_info;
if (unlikely(vmx->fail)) {
kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
@@ -2228,6 +2231,7 @@
static void vmx_intr_assist(struct kvm_vcpu *vcpu)
{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 idtv_info_field, intr_info_field;
int has_ext_irq, interrupt_window_open;
int vector;
@@ -2236,7 +2240,7 @@
has_ext_irq = kvm_cpu_has_interrupt(vcpu);
intr_info_field = vmcs_read32(VM_ENTRY_INTR_INFO_FIELD);
- idtv_info_field = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+ idtv_info_field = vmx->idt_vectoring_info;
if (intr_info_field & INTR_INFO_VALID_MASK) {
if (idtv_info_field & INTR_INFO_VALID_MASK) {
/* TODO: fault when IDT_Vectoring */
@@ -2396,6 +2400,8 @@
#endif
);
+ vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+
vcpu->interrupt_window_open =
(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;
@@ -2413,7 +2419,8 @@
unsigned long addr,
u32 err_code)
{
- u32 vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 vect_info = vmx->idt_vectoring_info;
++vcpu->stat.pf_guest;