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GET /api/1.1/patches/2233345/?format=api
{ "id": 2233345, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2233345/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/335c6213a3620f561983f67332ee39ece927ef0e.1778057685.git.sayalip@linux.ibm.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.1/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/" }, "msgid": "<335c6213a3620f561983f67332ee39ece927ef0e.1778057685.git.sayalip@linux.ibm.com>", "date": "2026-05-06T09:06:14", "name": "[3/3] lkdtm/powerpc: add PPC_RADIX_TLBIEL test for radix MCE validation", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "af04cdf2b162174b0bee1f5caa30f007b8c2e0e1", "submitter": { "id": 92656, "url": "http://patchwork.ozlabs.org/api/1.1/people/92656/?format=api", "name": "Sayali Patil", "email": "sayalip@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/335c6213a3620f561983f67332ee39ece927ef0e.1778057685.git.sayalip@linux.ibm.com/mbox/", "series": [ { "id": 502942, "url": "http://patchwork.ozlabs.org/api/1.1/series/502942/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=502942", "date": "2026-05-06T09:06:11", "name": "MCE robustness fixes and LKDTM powerpc enhancements", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502942/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2233345/comments/", "check": "success", "checks": "http://patchwork.ozlabs.org/api/patches/2233345/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20513-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=hDNNFAMI;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=linux.ibm.com;\n dkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=hDNNFAMI; dkim-atps=neutral;\n spf=pass (client-ip=148.163.158.5; helo=mx0b-001b2d01.pphosted.com;\n envelope-from=sayalip@linux.ibm.com;\n receiver=lists.ozlabs.org) smtp.mailfrom=linux.ibm.com", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n\t:content-transfer-encoding:date:from:in-reply-to:message-id\n\t:mime-version:references:subject:to; s=pp1; bh=fca4Z87N77h6CF+xs\n\tkmQZ8FX2ytJtrXFqslQ4+o6snA=; b=hDNNFAMIOXJMBkT+dbKosAtXZbkiEm2AU\n\tjb4IJO9Zvrdre56WaDGNpiDdkh5trQkllnEjOTM91le0T/5GjwDQNZVuEQwGCsaZ\n\tuUuDb7VnhrF1X/h9r1RhT3o8QkS4to6XNp7eBPy1agaAvF3gvcOxdwV8/w9mBN5z\n\t7ClGcpqzy49o4s7tF5qPSyQEkmeqiaUslb7hWSOIRp8SCvqV+ji0LXGvgG/XFuqm\n\tpK1/H/FQi5m/sHX/QrwJAIyQNzpM1n7XJma/45g/pybRfOGTWhU/WMzKZyXscvec\n\tk9r+Hr5JCFqHnN+mleG0e+roJxyzstdx1N1RnZyuOBxoQll9oHyjA==", "From": "Sayali Patil <sayalip@linux.ibm.com>", "To": "linuxppc-dev@lists.ozlabs.org, maddy@linux.ibm.com", "Cc": "linux-kernel@vger.kernel.org, Ritesh Harjani <ritesh.list@gmail.com>,\n Mahesh Salgaonkar <mahesh@linux.ibm.com>, sshegde@linux.ibm.com,\n chleroy@kernel.org", "Subject": "[PATCH 3/3] lkdtm/powerpc: add PPC_RADIX_TLBIEL test for radix MCE\n validation", "Date": "Wed, 6 May 2026 14:36:14 +0530", "Message-ID": "\n <335c6213a3620f561983f67332ee39ece927ef0e.1778057685.git.sayalip@linux.ibm.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<cover.1778057685.git.sayalip@linux.ibm.com>", "References": "<cover.1778057685.git.sayalip@linux.ibm.com>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Proofpoint-Reinject": "loops=2 maxloops=12", "X-Authority-Analysis": "v=2.4 cv=XPQAjwhE c=1 sm=1 tr=0 ts=69fb0498 cx=c_pps\n a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17\n a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=Y2IxJ9c9Rs8Kov3niI8_:22 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8\n a=3bI6KQ0BwHB4WGLmmHkA:9", "X-Proofpoint-ORIG-GUID": "BHIwcIAifCvlQbNFGXRzoW-2LHgaoUFM", "X-Proofpoint-GUID": "WPQNHz8BqwQBl0uM_ovwqqcivKUv6RoN", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNTA2MDA4OCBTYWx0ZWRfXxqwqQZRzNIKE\n GQSjozyIpYPFcIDo+flANupeEL6VEPNEnZpBD9BWhrUkOkC4U0wOLVMqkITs0ukcjnh5ON+usai\n zHSEq1W49Jp6kCQH1SVFeI5jKb0/oOUjH78dC1Ry8gyfohiRM5blOXfEFefG2P1bkZh9QZQ7A7c\n qkR1M7rFXn2zuegJPL9beiS5Z+JrLIlF6s+gjftyHEFaFJFaRaSn9gfz0H2x6sJsWrgdiThyBAh\n XrqrLhPL5djPKHTavKjQPI3MbgGg7XegYEClXtGamD3RRc7C6tOGsD2frJG65rrKwOQxgXVgQQy\n RBl+G3aNFBSGWpXoOkX1ddfYwp3Q/WOPZHQgaDuvdRLTDv0+rXSgL3buXub8wMGoZnHf3NPhmFf\n lZewsPmq24e24HbnTHbwpHFzGJzsZSHirRrZxYzkoZBE7ll9mJqJZlIWpDDseQmg8RT64r3P9DF\n sf/HRBn54iN8yg826OA==", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-05-05_03,2026-04-30_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n bulkscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0\n priorityscore=1501 impostorscore=0 phishscore=0 malwarescore=0 clxscore=1015\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605060088", "X-Spam-Status": "No, score=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tRCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "Add a new LKDTM trigger (PPC_RADIX_TLBIEL) that executes a process-scoped\nradix TLBIEL instruction to exercise the radix MMU behaviour and\nassociated machine check exception (MCE) handling paths.\n\nThis provides a way to validate MCE handling in radix mode. Currently,\nthere is no dedicated LKDTM test that exercises this path or allows\ntriggering radix-specific machine check behaviour for validation.\n\nThe test is only enabled on ppc64 systems with radix MMU\nsupport and If radix is not active, the trigger is skipped and reported as\nXFAIL.\n\nCo-developed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>\nSigned-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>\nSigned-off-by: Sayali Patil <sayalip@linux.ibm.com>\n---\n drivers/misc/lkdtm/Makefile | 2 +-\n drivers/misc/lkdtm/powerpc.c | 39 +++++++++++++++++++++++++\n tools/testing/selftests/lkdtm/tests.txt | 1 +\n 3 files changed, 41 insertions(+), 1 deletion(-)", "diff": "diff --git a/drivers/misc/lkdtm/Makefile b/drivers/misc/lkdtm/Makefile\nindex 03ebe33185f9..4e58d16fc01e 100644\n--- a/drivers/misc/lkdtm/Makefile\n+++ b/drivers/misc/lkdtm/Makefile\n@@ -11,7 +11,7 @@ lkdtm-$(CONFIG_LKDTM)\t\t+= usercopy.o\n lkdtm-$(CONFIG_LKDTM)\t\t+= kstack_erase.o\n lkdtm-$(CONFIG_LKDTM)\t\t+= cfi.o\n lkdtm-$(CONFIG_LKDTM)\t\t+= fortify.o\n-lkdtm-$(CONFIG_PPC_64S_HASH_MMU)\t+= powerpc.o\n+lkdtm-$(CONFIG_PPC_BOOK3S_64)\t+= powerpc.o\n \n KASAN_SANITIZE_stackleak.o\t:= n\n \ndiff --git a/drivers/misc/lkdtm/powerpc.c b/drivers/misc/lkdtm/powerpc.c\nindex ef07e5201edf..3d56b56f5e0c 100644\n--- a/drivers/misc/lkdtm/powerpc.c\n+++ b/drivers/misc/lkdtm/powerpc.c\n@@ -105,6 +105,31 @@ static void insert_dup_slb_entry_0(void)\n \tpreempt_enable();\n }\n \n+static void tlbiel_va(unsigned long va,\n+\t\t unsigned long pid,\n+\t\t unsigned long ap,\n+\t\t unsigned long ric)\n+{\n+\tunsigned long rb, rs, prs, r;\n+\n+\trb = va & ~(PPC_BITMASK(52, 63));\n+\trb |= ap << PPC_BITLSHIFT(58);\n+\trs = pid << PPC_BITLSHIFT(31);\n+\n+\tprs = 1; /* process scoped */\n+\tr = 1; /* radix format */\n+\n+\t/*\n+\t * Trigger an MCE by issuing radix tlbiel with an invalid operand combination.\n+\t * Using PRS=1 (process-scoped) with kernel address does not correspond to\n+\t * any valid process-scoped translation.\n+\t * This results in an invalid tlbiel operation, causing hardware to\n+\t * raise a machine check.\n+\t */\n+\tasm volatile(PPC_TLBIEL(%0, %4, %3, %2, %1)\n+\t\t\t: : \"r\"(rb), \"i\"(r), \"i\"(prs), \"i\"(ric), \"r\"(rs) : \"memory\");\n+}\n+\n static void lkdtm_PPC_SLB_MULTIHIT(void)\n {\n \tif (!radix_enabled()) {\n@@ -124,8 +149,22 @@ static void lkdtm_PPC_SLB_MULTIHIT(void)\n \t}\n }\n \n+static void lkdtm_PPC_RADIX_TLBIEL(void)\n+{\n+\tunsigned long addr = PAGE_OFFSET;\n+\n+\tif (radix_enabled()) {\n+\t\tpr_info(\"Injecting Radix TLB invalidation MCE\\n\");\n+\t\ttlbiel_va(addr, 0, 0, RIC_FLUSH_ALL);\n+\t\tpr_info(\"Recovered from radix tlbiel attempt\\n\");\n+\t} else {\n+\t\tpr_err(\"XFAIL: This test is for ppc64 and with radix mode MMU only\\n\");\n+\t}\n+}\n+\n static struct crashtype crashtypes[] = {\n \tCRASHTYPE(PPC_SLB_MULTIHIT),\n+\tCRASHTYPE(PPC_RADIX_TLBIEL),\n };\n \n struct crashtype_category powerpc_crashtypes = {\ndiff --git a/tools/testing/selftests/lkdtm/tests.txt b/tools/testing/selftests/lkdtm/tests.txt\nindex 3245032db34d..d8180bbe31e8 100644\n--- a/tools/testing/selftests/lkdtm/tests.txt\n+++ b/tools/testing/selftests/lkdtm/tests.txt\n@@ -86,3 +86,4 @@ FORTIFY_STR_MEMBER detected buffer overflow\n FORTIFY_MEM_OBJECT detected buffer overflow\n FORTIFY_MEM_MEMBER detected field-spanning write\n PPC_SLB_MULTIHIT Recovered\n+#PPC_RADIX_TLBIEL Triggers unrecoverable MCE\n", "prefixes": [ "3/3" ] }