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authorTianrui Zhao2023-10-02 10:01:29 +0800
committerHuacai Chen2023-10-02 10:01:29 +0800
commit37cdfc6dbf04169310a24f3a79b554c363260562 (patch)
tree062c5cead4ca4fda85bdc9c0101d275cda37c36c /arch/loongarch
parentd5b65882d57c91e5fec8c4c0b0a0a88f343b4525 (diff)
LoongArch: KVM: Implement handle fpu exception
Implement handle fpu exception, using kvm_own_fpu() to enable fpu for guest. Reviewed-by: Bibo Mao <maobibo@loongson.cn> Tested-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch')
-rw-r--r--arch/loongarch/kvm/exit.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index c31894b75b07..e855ab9099b2 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -631,3 +631,30 @@ static int kvm_handle_write_fault(struct kvm_vcpu *vcpu)
{
return kvm_handle_rdwr_fault(vcpu, true);
}
+
+/**
+ * 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;
+}