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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jun 2025 15:39:32.6170 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c71ea6de-0853-40c6-34b0-08dda834ff0d X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF00000191.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB6412 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250610_163941_202178_D3C58657 X-CRM114-Status: GOOD ( 18.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Mark, > > If FEAT_MTE_TAGGED_FAR (Armv8.9) is supported, bits 63:60 of the fault address > > are preserved in response to synchronous tag check faults (SEGV_MTESERR). > > > > This patch is preparation for testing FEAT_MTE_TAGGED_FAR. > > It shouldn't change the test result. > > I'm not clear from the above what the change is intended to do (ie, how > does it prepare for testing FEAT_MTE_TAGGED_FAR). I think this could > usefully be split out into multiple commits (eg, adding logging of the > additional si_ fields separately, or splitting the renaming MT_CLEAR_TAG > to MT_CLEAR_TAGS), it's kind of hard to review as is. My bad. I'll split this one. Thanks > > > @@ -45,13 +64,18 @@ void mte_default_handler(int signum, siginfo_t *si, void *uc) > > } > > /* Compare the context for precise error */ > > else if (si->si_code == SEGV_MTESERR) { > > + if ((!mtefar_support && si_atag) || (si_atag != MT_FETCH_ATAG(cur_mte_cxt.trig_addr))) { > > + ksft_print_msg("Invalid MTE synchronous exception caught for address tag! si_tag=%x, si_atag: %x\n", si_tag, si_atag); > > + exit(1); > > + } > > We should really exit with a kselftest error rather than just a number, > though I see this is just copying the existing style for the file so > *shrug*. Okay. I'll change this -- Sincerely, Yeoreum Yun