diff options
| author | Dominik Dingel <dingel@linux.vnet.ibm.com> | 2013-12-09 17:30:01 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-06 19:22:17 (GMT) |
| commit | 2bd6307cab16209fabb96feb236b808c46e2d22d (patch) | |
| tree | 41343035669537f43034c5bbc2a6fb991a82fbff /arch/s390/kvm/diag.c | |
| parent | a0cadc7231408c3edbe17f0fbfa6d3d721f06f07 (diff) | |
| download | linux-fsl-qoriq-2bd6307cab16209fabb96feb236b808c46e2d22d.tar.xz | |
KVM: s390: ioeventfd: ignore leftmost bits
commit ff1f3cb4b3ac5d039f02679f34cb1498d110d241 upstream.
The diagnose 500 subcode 3 contains the 32 bit subchannel id in bits 32-63
(counting from the left). As for other I/O instructions, bits 0-31 should be
ignored and thus not be passed to kvm_io_bus_write_cookie().
This fixes a bug where the guest passed non-zero bits 0-31 which the
host tried to interpret, leading to ioeventfd notification failures.
Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390/kvm/diag.c')
| -rw-r--r-- | arch/s390/kvm/diag.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c index 832f35c..d88e846 100644 --- a/arch/s390/kvm/diag.c +++ b/arch/s390/kvm/diag.c @@ -122,7 +122,7 @@ static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu) * - gpr 4 contains the index on the bus (optionally) */ ret = kvm_io_bus_write_cookie(vcpu->kvm, KVM_VIRTIO_CCW_NOTIFY_BUS, - vcpu->run->s.regs.gprs[2], + vcpu->run->s.regs.gprs[2] & 0xffffffff, 8, &vcpu->run->s.regs.gprs[3], vcpu->run->s.regs.gprs[4]); srcu_read_unlock(&vcpu->kvm->srcu, idx); |