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Thu, 1 Jan 2026 06:45:43 +0000 (GMT) Message-ID: <41ece6d5-e211-4b32-ab87-d1fe5f359228@linux.ibm.com> Date: Thu, 1 Jan 2026 12:15:42 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] ppc/pnv: Add dummy MMIO support for OCMB chips To: Caleb Schlossin , qemu-devel@nongnu.org Cc: qemu-ppc@nongnu.org, npiggin@gmail.com, milesg@linux.ibm.com, rathc@linux.ibm.com, chalapathi.v@linux.ibm.com References: <20251224142249.1356424-1-calebs@linux.ibm.com> Content-Language: en-US From: Aditya Gupta In-Reply-To: <20251224142249.1356424-1-calebs@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: P-MH_6H3G6OUuGiVVRJp-GKhtwrGuEgE X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTAxMDA1NCBTYWx0ZWRfXy9CdgNW/iD73 u/sd+uAHPlVSTVnfIRCLwQNyaUscKUX9xipK4OKRssZI1B9a8mWxtEyAHbzXp4SLrVDRYPqza1n LXDFBGON6/x7K0bqcsxmvYnQ6PzUcRI5lDbzSpqQzRpvw0XaGfV1/mazFf0YuA5nh45CO9vFv5E K4FKTCReFoWcV3uXZN1PHQswG7u9S1mXyPUFpKekczWkFwLq0TcADQzpwWZc+mpDxZWyuWsICbO /dEn6wxYM3ImvILgO6/BQa08Ei7vhRhtl8e6NvG0nBhcQk0mu7+8Hhr7qPcKY8D3EScLX7W5OyU tRC9yHaFJ7OnlXBeUHX1r9BY5/HHKPz/UQjzoi/9UfTeBnbgsAIC8S/yDf0FfGUa7hy7epzgNSq 703FQ895DaJQKZQa5zgaasB+X5snaB2ItuTlYBZYpvGySP3340WCxEm//ro5o9zxXGkXh8+eT14 Pe6WGBQSa/uRn/iP/NQ== X-Authority-Analysis: v=2.4 cv=fobRpV4f c=1 sm=1 tr=0 ts=6956181e cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=D4yLe6ciAAAA:8 a=VnNF1IyMAAAA:8 a=N2-0zKC2n98ZbhYZ008A:9 a=QEXdDO2ut3YA:10 a=RJBimmv2CioV9QQA5JKZ:22 X-Proofpoint-GUID: Xk6aFjhGekd_duXxppZOY93LziX-twGp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-01_02,2025-12-31_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 phishscore=0 adultscore=0 malwarescore=0 spamscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2512120000 definitions=main-2601010054 Received-SPF: pass client-ip=148.163.158.5; envelope-from=adityag@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 24/12/25 19:52, Caleb Schlossin wrote: > The Power Hypervisor for P10 expects to be able to access certain > Open CAPI Memory Buffer (OCMB) chip registers. Since QEMU does not > currently support these registers, several access errors are being > posted. The hypervisor is able to progress despite these errors, > but it does create unwanted noise on the console. Adding some > dummy MMIO support for this IO region in order to suppress the > error messages. Hi Caleb, If there any public document/spec available that documents these registers ? Can you please point me to it. I don't find any 'ocmb' mention in any docs here: https://computeexpresslink.org/resource/opencapi-specification-archive/ Since a new TODO is getting introduced here to implement those register accesses, it can only be done if some public information is available. Thanks, - Aditya G > Signed-off-by: Glenn Miles > Signed-off-by: Caleb Schlossin > --- > hw/ppc/meson.build | 1 + > hw/ppc/pnv.c | 10 ++++ > hw/ppc/pnv_ocmb.c | 103 ++++++++++++++++++++++++++++++++++++++ > include/hw/ppc/pnv.h | 3 ++ > include/hw/ppc/pnv_chip.h | 2 + > include/hw/ppc/pnv_ocmb.h | 38 ++++++++++++++ > 6 files changed, 157 insertions(+) > create mode 100644 hw/ppc/pnv_ocmb.c > create mode 100644 include/hw/ppc/pnv_ocmb.h >