KVM: x86 emulator: Allow accessing IDT via emulator ops

The patch adds a new member get_idt() to x86_emulate_ops.
It also adds a function to get the idt in order to be used by the emulator.

This is needed for real mode interrupt injection and the emulation of int
instructions.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

2 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index 1e4a72ce301a..1bbf2b6f2a7e 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -139,6 +139,7 @@ struct x86_emulate_ops {
         void (*set_segment_selector)(u16 sel, int seg, struct kvm_vcpu *vcpu);
         unsigned long (*get_cached_segment_base)(int seg, struct kvm_vcpu *vcpu);
         void (*get_gdt)(struct desc_ptr *dt, struct kvm_vcpu *vcpu);
+        void (*get_idt)(struct desc_ptr *dt, struct kvm_vcpu *vcpu);
         ulong (*get_cr)(int cr, struct kvm_vcpu *vcpu);
         int (*set_cr)(int cr, ulong val, struct kvm_vcpu *vcpu);
         int (*cpl)(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 35c0f4e4a621..768197a34d3e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3790,6 +3790,11 @@ static void emulator_get_gdt(struct desc_ptr *dt, struct kvm_vcpu *vcpu)
         kvm_x86_ops->get_gdt(vcpu, dt);
 }
 
+static void emulator_get_idt(struct desc_ptr *dt, struct kvm_vcpu *vcpu)
+{
+        kvm_x86_ops->get_idt(vcpu, dt);
+}
+
 static unsigned long emulator_get_cached_segment_base(int seg,
                                                       struct kvm_vcpu *vcpu)
 {
@@ -3883,6 +3888,7 @@ static struct x86_emulate_ops emulate_ops = {
         .set_segment_selector = emulator_set_segment_selector,
         .get_cached_segment_base = emulator_get_cached_segment_base,
         .get_gdt             = emulator_get_gdt,
+        .get_idt             = emulator_get_idt,
         .get_cr              = emulator_get_cr,
         .set_cr              = emulator_set_cr,
         .cpl                 = emulator_get_cpl,