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Commit 2e602847 authored by Alexander Graf's avatar Alexander Graf Committed by Avi Kivity
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KVM: PPC: Don't flush PTEs on NX/RO hit 



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: default avatarAlexander Graf <agraf@suse.de>
parent 4cb6b7ea

arch/powerpc/kvm/book3s.c

+0 −2
Original line number Diff line number Diff line
@@ -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;