Commit 63995653 authored by Mohammed Gamal's avatar Mohammed Gamal Committed by Avi Kivity
Browse files

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: default avatarMohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 4ab8e024

arch/x86/kvm/x86.c

+29 −0
Original line number Diff line number Diff line
@@ -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;

arch/x86/kvm/x86.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

CRA Git | Maintained and supported by SUSTech CRA and CCSE