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LoongArch: KVM: Implement handle fpu exception

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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>
This commit is contained in:
Tianrui Zhao 2023-10-02 10:01:29 +08:00 committed by Huacai Chen
parent d5b65882d5
commit 37cdfc6dbf
1 changed files with 27 additions and 0 deletions
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27
arch/loongarch/kvm/exit.c
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@ -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;
}