diff mbox series

[v21,24/29] LoongArch: KVM: Implement handle fpu exception

Message ID 20230915014949.1222777-25-zhaotianrui@loongson.cn
State New
Headers
Series Add KVM LoongArch support |

Commit Message

zhaotianrui Sept. 15, 2023, 1:49 a.m. UTC 
  Implement handle fpu exception, using kvm_own_fpu to enable fpu for
guest.

Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 arch/loongarch/kvm/exit.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
diff mbox series

Patch

diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index 004b91055a..a91811918d 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -638,3 +638,29 @@  static int kvm_handle_read_fault(struct kvm_vcpu *vcpu)
 {
 	return kvm_handle_mmu_fault(vcpu, false);
 }
+
+/**
+ * kvm_handle_fpu_disabled() - Guest used fpu however it is disabled at host
+ * @vcpu:	Virtual CPU context.
+ *
+ * Handle when the guest attempts to use fpu which hasn't been allowed
+ * by the root context.
+ */
+static int kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
+{
+	struct kvm_run *run = vcpu->run;
+
+	/*
+	 * If guest FPU not present, the FPU operation should have been
+	 * treated as a reserved instruction!
+	 * If FPU already in use, we shouldn't get this at all.
+	 */
+	if (WARN_ON(vcpu->arch.aux_inuse & KVM_LARCH_FPU)) {
+		kvm_err("%s internal error\n", __func__);
+		run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+		return RESUME_HOST;
+	}
+
+	kvm_own_fpu(vcpu);
+	return RESUME_GUEST;
+}