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Tsirkin" , qemu-s390x@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH 0/2] two atomic_cmpxchg() related fixes Date: Tue, 16 Jun 2020 06:50:33 +0200 Message-Id: <20200616045035.51641-1-pasic@linux.ibm.com> X-Mailer: git-send-email 2.17.1 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-15_11:2020-06-15, 2020-06-15 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 cotscore=-2147483648 adultscore=0 mlxlogscore=893 mlxscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 malwarescore=0 suspectscore=0 bulkscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006160028 Received-SPF: pass client-ip=148.163.158.5; envelope-from=pasic@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/16 00:50:51 X-ACL-Warn: Detected OS = Linux 3.1-3.10 X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Halil Pasic , Thomas Huth , David Hildenbrand , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The story short: compiler can generate code that does two distinct fetches of *ind_addr for old and _old. If that happens we can not figure out if we had the desired xchg or not. Halil Pasic (2): virtio-ccw: fix virtio_set_ind_atomic s390x/pci: fix set_ind_atomic hw/s390x/s390-pci-bus.c | 16 +++++++++------- hw/s390x/virtio-ccw.c | 18 ++++++++++-------- 2 files changed, 19 insertions(+), 15 deletions(-) base-commit: 7d3660e79830a069f1848bb4fa1cdf8f666424fb -- 2.17.1