On Sat, Aug 14, 2010 at 03:19:39AM +0300, Mohammed Gamal wrote:
> 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 <m.gamal005@xxxxxxxxx>
> ---
> 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);
> +
We have this code in 2 places already: kvm_task_switch() and emulate_instruction().
This will be the third one. Should be moved to separate function.
> + 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
>
> --
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--
Gleb.
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