From 4cb6b7ea0cd085e6613153ad69608cad6421abcc Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Mon, 2 Aug 2010 16:08:22 +0200 Subject: [PATCH] KVM: PPC: Preload magic page when in kernel mode 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 --- arch/powerpc/kvm/book3s.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 37db61d37041..54ca578239db 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -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 */ -- 2.30.2