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authorMohammed Gamal <m.gamal005@gmail.com>2010-09-19 14:34:06 +0200
committerAvi Kivity <avi@redhat.com>2010-10-24 10:53:01 +0200
commit63995653ade16deacaea5b49ceaf6376314593ac (patch)
tree92c4dc379a1c8925a53ce6d6abd5d4d0f85ecc49 /arch
parent4ab8e02404fcbc16beefac66de24dbb2706fe2f3 (diff)
KVM: Add kvm_inject_realmode_interrupt() wrapper
This adds a wrapper function kvm_inject_realmode_interrupt() around the emulator function emulate_int_real() to allow real mode interrupt injection. [avi: initialize operand and address sizes before emulating interrupts] [avi: initialize rip for real mode interrupt injection] [avi: clear interrupt pending flag after emulating interrupt injection] Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/x86.c29
-rw-r--r--arch/x86/kvm/x86.h1
2 files changed, 30 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3adf6921e88e..7d2880500fa3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4188,6 +4188,35 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
}
+int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq)
+{
+ struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
+ int ret;
+
+ init_emulate_ctxt(vcpu);
+
+ vcpu->arch.emulate_ctxt.decode.op_bytes = 2;
+ vcpu->arch.emulate_ctxt.decode.ad_bytes = 2;
+ vcpu->arch.emulate_ctxt.decode.eip = vcpu->arch.emulate_ctxt.eip;
+ ret = emulate_int_real(&vcpu->arch.emulate_ctxt, &emulate_ops, irq);
+
+ if (ret != X86EMUL_CONTINUE)
+ return EMULATE_FAIL;
+
+ vcpu->arch.emulate_ctxt.eip = c->eip;
+ memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
+ kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
+ kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
+
+ if (irq == NMI_VECTOR)
+ vcpu->arch.nmi_pending = false;
+ else
+ vcpu->arch.interrupt.pending = false;
+
+ return EMULATE_DONE;
+}
+EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
+
static int handle_emulation_failure(struct kvm_vcpu *vcpu)
{
++vcpu->stat.insn_emulation_fail;
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index bf4dc2f40d7f..2cea414489f3 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -72,6 +72,7 @@ static inline int is_paging(struct kvm_vcpu *vcpu)
void kvm_before_handle_nmi(struct kvm_vcpu *vcpu);
void kvm_after_handle_nmi(struct kvm_vcpu *vcpu);
+int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq);
void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data);