| Message ID | 20230530015223.147755-26-zhaotianrui@loongson.cn (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add KVM LoongArch support | expand |
Reviewed-by: Bibo, Mao <maobibo@loongson.cn> 在 2023/5/30 09:52, Tianrui Zhao 写道: > Implement handle fpu exception, using kvm_own_fpu to enable fpu for > guest. > > Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> > --- > arch/loongarch/kvm/exit.c | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c > index 1237ceb06d0c..10f9922a7e76 100644 > --- a/arch/loongarch/kvm/exit.c > +++ b/arch/loongarch/kvm/exit.c > @@ -631,3 +631,29 @@ 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; > +}
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index 1237ceb06d0c..10f9922a7e76 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -631,3 +631,29 @@ 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; +}
Implement handle fpu exception, using kvm_own_fpu to enable fpu for guest. Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> --- arch/loongarch/kvm/exit.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)