在 2023/5/30 09:52, Tianrui Zhao 写道:
> Implement vcpu handle exit interface, getting the exit code by ESTAT
> register and using kvm exception vector to handle it.
>
> Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
> ---
> arch/loongarch/kvm/vcpu.c | 46 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 46 insertions(+)
>
> diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
> index eca8b96a3e6e..ddea480fa5b0 100644
> --- a/arch/loongarch/kvm/vcpu.c
> +++ b/arch/loongarch/kvm/vcpu.c
> @@ -55,6 +55,52 @@ static void kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
> vcpu->arch.aux_inuse &= ~KVM_LARCH_CSR;
> }
>
> +/*
> + * Return 1 for resume guest and "<= 0" for resume host.
> + */
> +static int _kvm_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
> +{
> + unsigned long exst = vcpu->arch.host_estat;
> + u32 intr = exst & 0x1fff; /* ignore NMI */
> + u32 exccode = (exst & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;
> + int ret = RESUME_GUEST;
> +
> + vcpu->mode = OUTSIDE_GUEST_MODE;
> +
> + /* Set a default exit reason */
> + run->exit_reason = KVM_EXIT_UNKNOWN;
> + run->ready_for_interrupt_injection = 1;
Is ready_for_interrupt_injection used in qemu or kvm for LoongArch?
> +
> + local_irq_enable();
> + guest_state_exit_irqoff();
> +
> + trace_kvm_exit(vcpu, exccode);
> + if (exccode) {
> + ret = _kvm_handle_fault(vcpu, exccode);
> + } else {
> + WARN(!intr, "suspicious vm exiting");
how about comments like this?
WARN(!intr, "vm exiting with suspicious irq \n")
Regards
Bibo, Mao
> + ++vcpu->stat.int_exits;
> + }
> +
> + cond_resched();
> + local_irq_disable();
> +
> + if (ret == RESUME_HOST)
> + return ret;
> +
> + /* Only check for signals if not already exiting to userspace */
> + if (signal_pending(current)) {
> + vcpu->run->exit_reason = KVM_EXIT_INTR;
> + ++vcpu->stat.signal_exits;
> + return -EINTR;
> + }
> +
> + kvm_pre_enter_guest(vcpu);
> + trace_kvm_reenter(vcpu);
> + guest_state_enter_irqoff();
> + return RESUME_GUEST;
> +}
> +
> int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
> {
> unsigned long timer_hz;
