tree 35dcfbab1107a734ebd58ffd1ff5000e7c804965
parent 58bc33b2b700f8524772f3fc20272da2187060c8
author Dominik Dingel <dingel@linux.vnet.ibm.com> 1386610201 +0100
committer Cornelia Huck <cornelia.huck@de.ibm.com> 1386785141 +0100

KVM: s390: ioeventfd: ignore leftmost bits

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.

Cc: stable@vger.kernel.org
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>