From 37cdfc6dbf04169310a24f3a79b554c363260562 Mon Sep 17 00:00:00 2001 From: Tianrui Zhao Date: Mon, 2 Oct 2023 10:01:29 +0800 Subject: LoongArch: KVM: Implement handle fpu exception Implement handle fpu exception, using kvm_own_fpu() to enable fpu for guest. Reviewed-by: Bibo Mao Tested-by: Huacai Chen Signed-off-by: Tianrui Zhao Signed-off-by: Huacai Chen --- arch/loongarch/kvm/exit.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'arch/loongarch') 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; +} -- cgit v1.2.3