Re: [PATCH v12 08/31] LoongArch: KVM: Implement vcpu handle exit interface

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在 2023年06月05日 21:03, bibo, mao 写道:

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?
We do not handle ready_for_interrupt_injection when vcpu exit in qemu/kvm, and I will remove it.

Thanks
Tianrui Zhao

+
+	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
Thanks, this comment should contain more information, I will fix it.

Thanks
Tianrui Zhao
+		++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;




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