[PATCH 08/26] KVM: PPC: Don't flush PTEs on NX/RO hit
From: Alexander Graf <hidden>
Date: 2010-08-17 13:58:08
Also in:
kvm
Subsystem:
kernel virtual machine for powerpc (kvm/powerpc), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
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 <redacted> --- arch/powerpc/kvm/book3s.c | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index b3c1dde..3e017da 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c@@ -885,7 +885,6 @@ 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;
@@ -911,7 +910,6 @@ 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;
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1.6.0.2