diff options
Diffstat (limited to 'arch/powerpc/kvm/booke.h')
| -rw-r--r-- | arch/powerpc/kvm/booke.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/booke.h b/arch/powerpc/kvm/booke.h index d53bcf2558f..62c4fe55d19 100644 --- a/arch/powerpc/kvm/booke.h +++ b/arch/powerpc/kvm/booke.h @@ -23,6 +23,7 @@ #include <linux/types.h> #include <linux/kvm_host.h> #include <asm/kvm_ppc.h> +#include <asm/switch_to.h> #include "timing.h" /* interrupt priortity ordering */ @@ -96,4 +97,34 @@ enum int_class { void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type); +/* + * Load up guest vcpu FP state if it's needed. + * It also set the MSR_FP in thread so that host know + * we're holding FPU, and then host can help to save + * guest vcpu FP state if other threads require to use FPU. + * This simulates an FP unavailable fault. + * + * It requires to be called with preemption disabled. + */ +static inline void kvmppc_load_guest_fp(struct kvm_vcpu *vcpu) +{ +#ifdef CONFIG_PPC_FPU + if (vcpu->fpu_active && !(current->thread.regs->msr & MSR_FP)) { + load_up_fpu(); + current->thread.regs->msr |= MSR_FP; + } +#endif +} + +/* + * Save guest vcpu FP state into thread. + * It requires to be called with preemption disabled. + */ +static inline void kvmppc_save_guest_fp(struct kvm_vcpu *vcpu) +{ +#ifdef CONFIG_PPC_FPU + if (vcpu->fpu_active && (current->thread.regs->msr & MSR_FP)) + giveup_fpu(current); +#endif +} #endif /* __KVM_BOOKE_H__ */ |