diff options
| author | Paul Mackerras <paulus@samba.org> | 2013-06-22 17:14:48 +1000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2013-06-30 03:33:22 +0200 |
| commit | 6ed1485f65f0eb17aa7b649d5abe0b011b92f718 (patch) | |
| tree | 6aef39e1fee53d943a11e6c5a20c970d13ab713e /arch/powerpc/kvm/book3s_64_mmu.c | |
| parent | bc1bc4e3929d7a2e4078a9e48fe1e0bb853de1e6 (diff) | |
| download | linux-6ed1485f65f0eb17aa7b649d5abe0b011b92f718.tar.bz2 | |
KVM: PPC: Book3S PR: Don't keep scanning HPTEG after we find a match
The loop in kvmppc_mmu_book3s_64_xlate() that looks up a translation
in the guest hashed page table (HPT) keeps going if it finds an
HPTE that matches but doesn't allow access. This is incorrect; it
is different from what the hardware does, and there should never be
more than one matching HPTE anyway. This fixes it to stop when any
matching HPTE is found.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu.c | 14 |
1 files changed, 2 insertions, 12 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c index b871721c0050..2e93bb50a71c 100644 --- a/arch/powerpc/kvm/book3s_64_mmu.c +++ b/arch/powerpc/kvm/book3s_64_mmu.c @@ -167,7 +167,6 @@ static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, int i; u8 key = 0; bool found = false; - bool perm_err = false; int second = 0; ulong mp_ea = vcpu->arch.magic_page_ea; @@ -248,11 +247,6 @@ do_second: break; } - if (!gpte->may_read) { - perm_err = true; - continue; - } - dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx " "-> 0x%lx\n", eaddr, avpn, gpte->vpage, gpte->raddr); @@ -281,6 +275,8 @@ do_second: if (pteg[i+1] != oldr) copy_to_user((void __user *)ptegp, pteg, sizeof(pteg)); + if (!gpte->may_read) + return -EPERM; return 0; } else { dprintk("KVM MMU: No PTE found (ea=0x%lx sdr1=0x%llx " @@ -296,13 +292,7 @@ do_second: } } - no_page_found: - - - if (perm_err) - return -EPERM; - return -ENOENT; no_seg_found: |