From c22c31963b4b0c23250e8f520a76427b3986b73b Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Mon, 2 Aug 2010 13:38:18 +0200 Subject: [PATCH] KVM: PPC: Fix sid map search after flush After a flush the sid map contained lots of entries with 0 for their gvsid and hvsid value. Unfortunately, 0 can be a real value the guest searches for when looking up a vsid so it would incorrectly find the host's 0 hvsid mapping which doesn't belong to our sid space. So let's also check for the valid bit that indicated that the sid we're looking at actually contains useful data. Signed-off-by: Alexander Graf --- arch/powerpc/kvm/book3s_64_mmu_host.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_host.c b/arch/powerpc/kvm/book3s_64_mmu_host.c index aa516ad81de7..ebb1b5ddabfb 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_host.c +++ b/arch/powerpc/kvm/book3s_64_mmu_host.c @@ -65,14 +65,14 @@ static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid) sid_map_mask = kvmppc_sid_hash(vcpu, gvsid); map = &to_book3s(vcpu)->sid_map[sid_map_mask]; - if (map->guest_vsid == gvsid) { + if (map->valid && (map->guest_vsid == gvsid)) { dprintk_slb("SLB: Searching: 0x%llx -> 0x%llx\n", gvsid, map->host_vsid); return map; } map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask]; - if (map->guest_vsid == gvsid) { + if (map->valid && (map->guest_vsid == gvsid)) { dprintk_slb("SLB: Searching 0x%llx -> 0x%llx\n", gvsid, map->host_vsid); return map; -- 2.20.1