Implement vcpu run interface, handling mmio, iocsr reading fault
and deliver interrupt, lose fpu before vcpu enter guest.
Reviewed-by: Bibo Mao <maobibo@xxxxxxxxxxx>
Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
---
arch/loongarch/kvm/vcpu.c | 130 ++++++++++++++++++++++++++++++++++++++
1 file changed, 130 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 545b18cd1c..83f2988ea6 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -18,6 +18,91 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
return 0;
}
+/*
+ * _kvm_check_requests - check and handle pending vCPU requests
+ *
+ * Return: RESUME_GUEST if we should enter the guest
+ * RESUME_HOST if we should exit to userspace
+ */
+static int _kvm_check_requests(struct kvm_vcpu *vcpu)
+{
+ if (!kvm_request_pending(vcpu))
+ return RESUME_GUEST;
+
+ if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
+ /* Drop vpid for this vCPU */
+ vcpu->arch.vpid = 0;
+
+ if (kvm_dirty_ring_check_request(vcpu))
+ return RESUME_HOST;
+
+ return RESUME_GUEST;
+}
+
+/*
+ * Check and handle pending signal and vCPU requests etc
+ * Run with irq enabled and preempt enabled
+ *
+ * Return: RESUME_GUEST if we should enter the guest
+ * RESUME_HOST if we should exit to userspace
+ * < 0 if we should exit to userspace, where the return value
+ * indicates an error
+ */
+static int kvm_enter_guest_check(struct kvm_vcpu *vcpu)
+{
+ int ret;
+
+ /*
+ * Check conditions before entering the guest
+ */
+ ret = xfer_to_guest_mode_handle_work(vcpu);
+ if (ret < 0)
+ return ret;
+
+ ret = _kvm_check_requests(vcpu);
+ return ret;
+}
+
+/*
+ * called with irq enabled
+ *
+ * Return: RESUME_GUEST if we should enter the guest, and irq disabled
+ * Others if we should exit to userspace
+ */
+static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
+{
+ int ret;
+
+ do {
+ ret = kvm_enter_guest_check(vcpu);
+ if (ret != RESUME_GUEST)
+ break;
+
+ /*
+ * handle vcpu timer, interrupts, check requests and
+ * check vmid before vcpu enter guest
+ */
+ local_irq_disable();
+ kvm_acquire_timer(vcpu);
+ _kvm_deliver_intr(vcpu);
+ /* make sure the vcpu mode has been written */
+ smp_store_mb(vcpu->mode, IN_GUEST_MODE);
+ _kvm_check_vmid(vcpu);
+ vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY);
+ /* clear KVM_LARCH_CSR as csr will change when enter guest */
+ vcpu->arch.aux_inuse &= ~KVM_LARCH_CSR;
+
+ if (kvm_request_pending(vcpu) || xfer_to_guest_mode_work_pending()) {
+ /* make sure the vcpu mode has been written */
+ smp_store_mb(vcpu->mode, OUTSIDE_GUEST_MODE);
+ local_irq_enable();
+ ret = -EAGAIN;
+ }
+ } while (ret != RESUME_GUEST);
+
+ return ret;
+}
+
int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
unsigned long timer_hz;
@@ -85,3 +170,48 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
context->last_vcpu = NULL;
}
}
+
+int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
+{
+ int r = -EINTR;
+ struct kvm_run *run = vcpu->run;
+
+ if (vcpu->mmio_needed) {
+ if (!vcpu->mmio_is_write)
+ _kvm_complete_mmio_read(vcpu, run);
+ vcpu->mmio_needed = 0;
+ }
+
+ if (run->exit_reason == KVM_EXIT_LOONGARCH_IOCSR) {
+ if (!run->iocsr_io.is_write)
+ _kvm_complete_iocsr_read(vcpu, run);
+ }
+
+ /* clear exit_reason */
+ run->exit_reason = KVM_EXIT_UNKNOWN;
+ if (run->immediate_exit)
+ return r;
+
+ lose_fpu(1);
+ vcpu_load(vcpu);
+ kvm_sigset_activate(vcpu);
+ r = kvm_pre_enter_guest(vcpu);
+ if (r != RESUME_GUEST)
+ goto out;
+
+ guest_timing_enter_irqoff();
+ guest_state_enter_irqoff();
+ trace_kvm_enter(vcpu);
+ r = kvm_loongarch_ops->enter_guest(run, vcpu);
+
+ trace_kvm_out(vcpu);
+ /*
+ * guest exit is already recorded at _kvm_handle_exit
+ * return val must not be RESUME_GUEST
+ */
+ local_irq_enable();
+out:
+ kvm_sigset_deactivate(vcpu);
+ vcpu_put(vcpu);
+ return r;
+}
--
2.27.0
