diff options
| author | Paul Mackerras <paulus@samba.org> | 2013-06-22 11:13:32 +0400 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2013-06-30 05:33:21 +0400 |
| commit | 8ed7b7e9d2a4e208d3c94af3ddbc628317b30409 (patch) | |
| tree | ce910db4d2626eb1757b40c242133b2d3ce53564 /arch/powerpc/kvm/book3s_64_mmu_host.c | |
| parent | 5f17ce8b954a2ff93f0460a2ae35d56285697d0f (diff) | |
| download | linux-8ed7b7e9d2a4e208d3c94af3ddbc628317b30409.tar.xz | |
KVM: PPC: Book3S PR: Fix proto-VSID calculations
This makes sure the calculation of the proto-VSIDs used by PR KVM
is done with 64-bit arithmetic. Since vcpu3s->context_id[] is int,
when we do vcpu3s->context_id[0] << ESID_BITS the shift will be done
with 32-bit instructions, possibly leading to significant bits
getting lost, as the context id can be up to 524283 and ESID_BITS is
18. To fix this we cast the context id to u64 before shifting.
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_host.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu_host.c | 4 |
1 files 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 3a9a1aceb14f..2c6e7ee8be34 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_host.c +++ b/arch/powerpc/kvm/book3s_64_mmu_host.c @@ -325,9 +325,9 @@ int kvmppc_mmu_init(struct kvm_vcpu *vcpu) return -1; vcpu3s->context_id[0] = err; - vcpu3s->proto_vsid_max = ((vcpu3s->context_id[0] + 1) + vcpu3s->proto_vsid_max = ((u64)(vcpu3s->context_id[0] + 1) << ESID_BITS) - 1; - vcpu3s->proto_vsid_first = vcpu3s->context_id[0] << ESID_BITS; + vcpu3s->proto_vsid_first = (u64)vcpu3s->context_id[0] << ESID_BITS; vcpu3s->proto_vsid_next = vcpu3s->proto_vsid_first; kvmppc_mmu_hpte_init(vcpu); |