This adds a wrapper function inject_realmode_interrupt() around the emulator function emulate_int_real() to allow real mode interrupt injection.
Signed-off-by: Mohammed Gamal <[email protected]> --- arch/x86/kvm/x86.c | 33 +++++++++++++++++++++++++++++++++ arch/x86/kvm/x86.h | 1 + 2 files changed, 34 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 1722d37..d3ba1c3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3936,6 +3936,39 @@ static void inject_emulated_exception(struct kvm_vcpu *vcpu) kvm_queue_exception(vcpu, ctxt->exception); } +int inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq) +{ + struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode; + int cs_db, cs_l, ret; + cache_all_regs(vcpu); + + kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); + + vcpu->arch.emulate_ctxt.vcpu = vcpu; + vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu); + vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu); + vcpu->arch.emulate_ctxt.mode = + (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL : + (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM) + ? X86EMUL_MODE_VM86 : cs_l + ? X86EMUL_MODE_PROT64 : cs_db + ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; + memset(c, 0, sizeof(struct decode_cache)); + memcpy(c->regs, vcpu->arch.regs, sizeof c->regs); + + ret = emulate_int_real(&vcpu->arch.emulate_ctxt, &emulate_ops, irq); + + if (ret != X86EMUL_CONTINUE) + return EMULATE_FAIL; + + 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); + + return EMULATE_DONE; +} +EXPORT_SYMBOL_GPL(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 b7a4047..c6e8a4d 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -67,5 +67,6 @@ 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 inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq); #endif -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
