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| author | Dominik Dingel <dingel@linux.vnet.ibm.com> | 2013-12-09 18:30:01 +0100 |
|---|---|---|
| committer | Cornelia Huck <cornelia.huck@de.ibm.com> | 2013-12-11 19:05:41 +0100 |
| commit | ff1f3cb4b3ac5d039f02679f34cb1498d110d241 (patch) | |
| tree | 35dcfbab1107a734ebd58ffd1ff5000e7c804965 /arch/s390/kvm/diag.c | |
| parent | KVM: s390: SIGP START has to report BUSY while stopping a CPU (diff) | |
| download | linux-ff1f3cb4b3ac5d039f02679f34cb1498d110d241.tar.xz linux-ff1f3cb4b3ac5d039f02679f34cb1498d110d241.zip | |
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>
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 5ff29be7d87a..8216c0e0b2e2 100644 --- a/arch/s390/kvm/diag.c +++ b/arch/s390/kvm/diag.c @@ -121,7 +121,7 @@ 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]); |