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 | 86 +++++++++++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 571ac8b9d..e08a4faa0 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -38,6 +38,92 @@ static int _kvm_check_requests(struct kvm_vcpu *vcpu, int cpu)
return ret;
}
+/*
+ * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
+ */
+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;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ int ret = RESUME_GUEST, cpu;
+
+ vcpu->mode = OUTSIDE_GUEST_MODE;
+
+ /* Set a default exit reason */
+ run->exit_reason = KVM_EXIT_UNKNOWN;
+ run->ready_for_interrupt_injection = 1;
+
+ /*
+ * Set the appropriate status bits based on host CPU features,
+ * before we hit the scheduler
+ */
+
+ local_irq_enable();
+
+ kvm_debug("%s: exst: %lx, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
+ __func__, exst, opc, run, vcpu);
+ trace_kvm_exit(vcpu, exccode);
+ if (exccode) {
+ ret = _kvm_handle_fault(vcpu, exccode);
+ } else {
+ WARN(!intr, "suspicious vm exiting");
+ ++vcpu->stat.int_exits;
+
+ if (need_resched())
+ cond_resched();
+
+ ret = RESUME_GUEST;
+ }
+
+ cond_resched();
+
+ local_irq_disable();
+
+ if (ret == RESUME_GUEST)
+ kvm_acquire_timer(vcpu);
+
+ if (!(ret & RESUME_HOST)) {
+ _kvm_deliver_intr(vcpu);
+ /* Only check for signals if not already exiting to userspace */
+ if (signal_pending(current)) {
+ run->exit_reason = KVM_EXIT_INTR;
+ ret = (-EINTR << 2) | RESUME_HOST;
+ ++vcpu->stat.signal_exits;
+ trace_kvm_exit(vcpu, KVM_TRACE_EXIT_SIGNAL);
+ }
+ }
+
+ if (ret == RESUME_GUEST) {
+ trace_kvm_reenter(vcpu);
+
+ /*
+ * Make sure the read of VCPU requests in vcpu_reenter()
+ * callback is not reordered ahead of the write to vcpu->mode,
+ * or we could miss a TLB flush request while the requester sees
+ * the VCPU as outside of guest mode and not needing an IPI.
+ */
+ smp_store_mb(vcpu->mode, IN_GUEST_MODE);
+
+ cpu = smp_processor_id();
+ _kvm_check_requests(vcpu, cpu);
+ _kvm_check_vmid(vcpu, cpu);
+ vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY);
+
+ /*
+ * If FPU are enabled (i.e. the guest's FPU context
+ * is live), restore FCSR0.
+ */
+ if (_kvm_guest_has_fpu(&vcpu->arch) &&
+ read_csr_euen() & (CSR_EUEN_FPEN)) {
+ kvm_restore_fcsr(&vcpu->arch.fpu);
+ }
+ }
+
+ return ret;
+}
+
int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
int i;
--
2.31.1
