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>

diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index 1e4a72c..1bbf2b6 100644 (file)
--- 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 35c0f4e..768197a 100644 (file)
--- 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,