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KVM: PPC: Preload magic page when in kernel mode

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When the guest jumps into kernel mode and has the magic page mapped, theres a
very high chance that it will also use it. So let's detect that scenario and
map the segment accordingly.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2010-08-02 16:08:22 +02:00 committed by Avi Kivity
parent c60b4cf701
commit 4cb6b7ea0c
1 changed files with 10 additions and 0 deletions
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10
arch/powerpc/kvm/book3s.c
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@ -145,6 +145,16 @@ void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
(old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
kvmppc_mmu_flush_segments(vcpu);
kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
/* Preload magic page segment when in kernel mode */
if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
struct kvm_vcpu_arch *a = &vcpu->arch;
if (msr & MSR_DR)
kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
else
kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
}
}
/* Preload FPU if it's enabled */