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Commit 4cb6b7ea authored by Alexander Graf's avatar Alexander Graf Committed by Avi Kivity
Browse files

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: default avatarAlexander Graf <agraf@suse.de>
parent c60b4cf7

arch/powerpc/kvm/book3s.c

+10 −0
Original line number Diff line number Diff line
@@ -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 */