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Tue, 18 Aug 2020 03:33:44 +0000 (GMT) From: Thiago Jung Bauermann To: qemu-ppc@nongnu.org Subject: [PATCH v4 0/8] Generalize start-powered-off property from ARM Date: Tue, 18 Aug 2020 00:33:15 -0300 Message-Id: <20200818033323.336912-1-bauerman@linux.ibm.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-08-18_01:2020-08-17, 2020-08-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 mlxlogscore=999 spamscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 phishscore=0 suspectscore=1 bulkscore=0 adultscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008180022 Received-SPF: pass client-ip=148.163.156.1; envelope-from=bauerman@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/17 21:44:44 X-ACL-Warn: Detected OS = Linux 3.x [generic] [fuzzy] X-Spam_score_int: -36 X-Spam_score: -3.7 X-Spam_bar: --- X-Spam_report: (-3.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: Peter Maydell , David Hildenbrand , Mark Cave-Ayland , qemu-devel@nongnu.org, Aleksandar Markovic , Thomas Huth , David Gibson , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Artyom Tarasenko , Aleksandar Rikalo , Eduardo Habkost , Greg Kurz , qemu-s390x@nongnu.org, qemu-arm@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Richard Henderson , Cornelia Huck , Aurelien Jarno , Paolo Bonzini , Thiago Jung Bauermann Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This version tries to fix an issue found by David Gibson when running the Travis CI: Unexpected error in qdev_prop_set_after_realize() at /home/travis/build/dgibson/qemu/hw/core/qdev-properties.c:30: qemu-system-mips64el: Attempt to set property 'start-powered-off' on anonymous device (type 'I6400-mips64-cpu') after it was realized Broken pipe /home/travis/build/dgibson/qemu/tests/qtest/libqtest.c:175: kill_qemu() detected QEMU death from signal 6 (Aborted) (core dumped) Aborted (core dumped) ERROR qom-test - too few tests run (expected 8, got 0) /home/travis/build/dgibson/qemu/tests/Makefile.include:650: recipe for target 'check-qtest-mips64el' failed Philippe Mathieu-Daudé spotted the problem: > Good catch. hw/mips/cps.c, hw/ppc/e500.c and hw/sparc/sun4m.c are > incorrectly setting the property after the cpu is realized because > the cpu is created with cpu_create(). We need to create them with > object_initialize_child() and realize them manually with qdev_realize(). But I found very few examples of CPUs initialized with object_initialize_child() (e.g., atmega.c, rx62n.c, nrf51_soc.c) so instead of using object_initialize_child(), I replaced the call to cpu_create() with object_new() and a call to qdev_realize() shortly after the start-powered-off property is set. I thought this would be the more prudent change, keeping the code as close to the previous one as possible. I tried reproducing the Travis CI problem with `make docker-test-misc@debian-mips64el-cross` but I didn't succeed, so I'm not sure if this version solves the issue. Original cover letter bellow, followed by changelog: The ARM code has a start-powered-off property in ARMCPU, which is a subclass of CPUState. This property causes arm_cpu_reset() to set CPUState::halted to 1, signalling that the CPU should start in a halted state. Other architectures also have code which aim to achieve the same effect, but without using a property. The ppc/spapr version has a bug where QEMU does a KVM_RUN on the vcpu before cs->halted is set to 1, causing the vcpu to run while it's still in an unitialized state (more details in patch 3). Peter Maydell mentioned the ARM start-powered-off property and Eduardo Habkost suggested making it generic, so this patch series does that, for all cases which I was able to find via grep in the code. The only problem is that I was only able to test these changes on a ppc64le pseries KVM guest, so except for patches 2 and 3, all others are only build-tested. Also, my grasp of QOM lifecycle is basically non-existant so please be aware of that when reviewing this series. The last patch may be wrong, as pointed out by Eduardo, so I marked it as RFC. It may make sense to drop it. Applies cleanly on yesterday's master. Changes since v3: General: - Added David's, Greg's and Cornelia's Reviewed-by and Acked-by to some of the patches. - Rebased on top of dgibson/ppc-for-5.2. Patch "ppc/e500: Use start-powered-off CPUState property" Patch "mips/cps: Use start-powered-off CPUState property" Patch "sparc/sun4m: Use start-powered-off CPUState property" - Initialize CPU object with object_new() and qdev_realize() instead of cpu_create(). - Removed Reviewed-by's and Acked-by's from these patches because of these changes. Changes since v2: General: - Added Philippe's Reviewed-by to some of the patches. Patch "ppc/spapr: Use start-powered-off CPUState property" - Set the CPUState::start_powered_off variable directly rather than using object_property_set_bool(). Suggested by Philippe. Patch "sparc/sun4m: Remove main_cpu_reset()" - New patch. Suggested by Philippe. Patch "sparc/sun4m: Use start-powered-off CPUState property" - Remove secondary_cpu_reset(). Suggested by Philippe. - Remove setting of `cs->halted = 1` from cpu_devinit(). Suggested by Philippe. Patch "Don't set CPUState::halted in cpu_devinit()" - Squashed into previous patch. Suggested by Philippe. Patch "sparc/sun4m: Use one cpu_reset() function for main and secondary CPUs" - Dropped. Patch "target/s390x: Use start-powered-off CPUState property" - Set the CPUState::start_powered_off variable directly rather than using object_property_set_bool(). Suggested by Philippe. - Mention in the commit message Eduardo's observation that before this patch, the code didn't set cs->halted on reset. Thiago Jung Bauermann (8): target/arm: Move start-powered-off property to generic CPUState target/arm: Move setting of CPU halted state to generic code ppc/spapr: Use start-powered-off CPUState property ppc/e500: Use start-powered-off CPUState property mips/cps: Use start-powered-off CPUState property sparc/sun4m: Remove main_cpu_reset() sparc/sun4m: Use start-powered-off CPUState property target/s390x: Use start-powered-off CPUState property exec.c | 1 + hw/core/cpu.c | 2 +- hw/mips/cps.c | 16 ++++++++++++---- hw/ppc/e500.c | 19 +++++++++++++++---- hw/ppc/spapr_cpu_core.c | 10 +++++----- hw/sparc/sun4m.c | 37 ++++++++++--------------------------- include/hw/core/cpu.h | 4 ++++ target/arm/cpu.c | 4 +--- target/arm/cpu.h | 3 --- target/arm/kvm32.c | 2 +- target/arm/kvm64.c | 2 +- target/s390x/cpu.c | 2 +- 12 files changed, 52 insertions(+), 50 deletions(-)