Implement vcpu handle exit interface, getting the exit code by ESTAT
register and using kvm exception vector to handle it.
Reviewed-by: Bibo Mao <maobibo@xxxxxxxxxxx>
Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
---
arch/loongarch/kvm/vcpu.c | 41 +++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 83f2988ea6..ca4e8d074e 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -103,6 +103,47 @@ static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
return ret;
}
+/*
+ * 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;
+
+ guest_timing_exit_irqoff();
+ guest_state_exit_irqoff();
+ local_irq_enable();
+
+ trace_kvm_exit(vcpu, exccode);
+ if (exccode) {
+ ret = _kvm_handle_fault(vcpu, exccode);
+ } else {
+ WARN(!intr, "vm exiting with suspicious irq\n");
+ ++vcpu->stat.int_exits;
+ }
+
+ if (ret == RESUME_GUEST)
+ ret = kvm_pre_enter_guest(vcpu);
+
+ if (ret != RESUME_GUEST) {
+ local_irq_disable();
+ return ret;
+ }
+
+ guest_timing_enter_irqoff();
+ guest_state_enter_irqoff();
+ trace_kvm_reenter(vcpu);
+ return RESUME_GUEST;
+}
+
int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
unsigned long timer_hz;
--
2.27.0
