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KVM: PPC: Don't flush PTEs on NX/RO hit

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When hitting a no-execute or read-only data/inst storage interrupt we were
flushing the respective PTE so we're sure it gets properly overwritten next.

According to the spec, this is unnecessary though. The guest issues a tlbie
anyways, so we're safe to just keep the PTE around and have it manually removed
from the guest, saving us a flush.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2010-08-02 20:11:39 +02:00 committed by Avi Kivity
parent 4cb6b7ea0c
commit 2e602847d9
1 changed files with 0 additions and 2 deletions
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2
arch/powerpc/kvm/book3s.c
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@ -887,7 +887,6 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
vcpu->arch.shared->msr |=
to_svcpu(vcpu)->shadow_srr1 & 0x58000000;
kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
r = RESUME_GUEST;
}
break;
@ -913,7 +912,6 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
vcpu->arch.shared->dar = dar;
vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr;
kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
kvmppc_mmu_pte_flush(vcpu, dar, ~0xFFFUL);
r = RESUME_GUEST;
}
break;