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KVM: PPC: Preload FPU when possible 

There are some situations when we're pretty sure the guest will use the
FPU soon. So we can save the churn of going into the guest, finding out
it does want to use the FPU and going out again.

This patch adds preloading of the FPU when it's reasonable.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2010-02-19 11:00:35 +01:00 committed by Avi Kivity
parent c8c0b6f2f7
commit d1bab74c51
1 changed files with 8 additions and 0 deletions
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8
arch/powerpc/kvm/book3s.c
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@ -138,6 +138,10 @@ void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
kvmppc_mmu_flush_segments(vcpu);
kvmppc_mmu_map_segment(vcpu, vcpu->arch.pc);
}
/* Preload FPU if it's enabled */
if (vcpu->arch.msr & MSR_FP)
kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
}
void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags)
@ -1196,6 +1200,10 @@ int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
/* XXX we get called with irq disabled - change that! */
local_irq_enable();
/* Preload FPU if it's enabled */
if (vcpu->arch.msr & MSR_FP)
kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
ret = __kvmppc_vcpu_entry(kvm_run, vcpu);
local_irq_disable();