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Tue, 6 Jan 2026 16:58:45 +0000 (GMT) Message-ID: <592d42050fdbdba45f395487d8ee80de0ff247ca.camel@linux.ibm.com> Subject: Re: [PATCH 2/4] ppc/pnv: Support for SECURITY_SWITCH XSCOM register access From: Miles Glenn To: Caleb Schlossin , qemu-devel@nongnu.org Cc: qemu-ppc@nongnu.org, npiggin@gmail.com, adityag@linux.ibm.com, chalapathi.v@linux.ibm.com Date: Tue, 06 Jan 2026 10:58:45 -0600 In-Reply-To: <20251218200353.301866-3-calebs@linux.ibm.com> References: <20251218200353.301866-1-calebs@linux.ibm.com> <20251218200353.301866-3-calebs@linux.ibm.com> Organization: IBM Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5 (3.28.5-27.el8_10) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=QbNrf8bv c=1 sm=1 tr=0 ts=695d3f49 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=TRwDyEk3oLEpmU-Z7y4A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: k8PKbma4iC30Bv-npq2i9tyraB6iMF4u X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA2MDE0NiBTYWx0ZWRfX6ALOCHnVSgLX LvVy/R1/HKWG+1hbX9zs8R2k3S9LQA9aVYC+ojgdxoIg45gChD/uE0xBHK4W0p3NX82H8eCf40O ysdbwj6c94zIiU3ySiDPxhfFTO1UvbnZmgiCIvRgXoidpTn5wNAZpJtd6Qoe7wD4HH5Bw623LL4 +wuRD/BPcnceKkSIPNr3qscBvYCJspPYn+WXGWGyHAd2Bvwkhvg1PV9EyNOCUkmEh7hkgUJOEia ZtOIHA9oPEuxDFrk3kzxpiuKspIKCBWnUFESjkcbRSZnvcO1sXqexLZ4fhCvpRNBp+GCR1Aqk9m kCUA5IpFnY70SStJpiCR9LtkzlA9V8mXpyXgz5R9HvmUO0T7oQEh12w+em9OWJfumCopYxGRFcT qi9Dply3ylUVxQuDyc8i/KsX6uuOFhJuqF6G4y8ATUUZgg72qS5fNS4rCc0Z/AHe8TcGljRSyaE g974iJH3vQnBphKMtKw== X-Proofpoint-GUID: QJomRFMJk4U4MgA67dSLmRLpm-roCGou 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=2026-01-06_01,2026-01-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 bulkscore=0 suspectscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 impostorscore=0 phishscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2512120000 definitions=main-2601060146 Received-SPF: pass client-ip=148.163.156.1; envelope-from=milesg@linux.ibm.com; helo=mx0a-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: , Reply-To: milesg@linux.ibm.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Reviewed-by: Glenn Miles Thanks, Glenn On Thu, 2025-12-18 at 14:03 -0600, Caleb Schlossin wrote: > Power Hypervisor code requires access to the SECURITY_SWITCH > XSCOM register at MMIO address 0x80028 (scom address 0x10005). > Adding basic read support for now so that is doesn't cause > error messages to be posted. > > Signed-off-by: Glenn Miles > Signed-off-by: Caleb Schlossin > --- > hw/ppc/pnv_xscom.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/hw/ppc/pnv_xscom.c b/hw/ppc/pnv_xscom.c > index fbfec829d5..308430def7 100644 > --- a/hw/ppc/pnv_xscom.c > +++ b/hw/ppc/pnv_xscom.c > @@ -61,6 +61,8 @@ static uint32_t pnv_xscom_pcba(PnvChip *chip, uint64_t addr) > static uint64_t xscom_read_default(PnvChip *chip, uint32_t pcba) > { > switch (pcba) { > + case 0x10005: /* SECURITY SWITCH */ > + return 0; > case 0xf000f: > return PNV_CHIP_GET_CLASS(chip)->chip_cfam_id; > case 0x18002: /* ECID2 */