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GET /api/1.1/patches/2232508/?format=api
{ "id": 2232508, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2232508/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260504-feat-mte4-v5-12-232a648e63c6@gmail.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260504-feat-mte4-v5-12-232a648e63c6@gmail.com>", "date": "2026-05-04T15:50:45", "name": "[v5,12/15] target/arm: tag is not a part of PAuth with MTX", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "b00f11511c5998201aa4a1d0e2de83d25dc5a836", "submitter": { "id": 91863, "url": "http://patchwork.ozlabs.org/api/1.1/people/91863/?format=api", "name": "Gabriel Brookman", "email": "brookmangabriel@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260504-feat-mte4-v5-12-232a648e63c6@gmail.com/mbox/", "series": [ { "id": 502688, "url": "http://patchwork.ozlabs.org/api/1.1/series/502688/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502688", "date": "2026-05-04T15:50:33", "name": "target/arm: add support for MTE4", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/502688/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2232508/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2232508/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=ZzuGG8ZD;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "Message-Id": "<20260504-feat-mte4-v5-12-232a648e63c6@gmail.com>", "References": "<20260504-feat-mte4-v5-0-232a648e63c6@gmail.com>", "In-Reply-To": "<20260504-feat-mte4-v5-0-232a648e63c6@gmail.com>", "To": "qemu-devel@nongnu.org", "Cc": "Peter Maydell <peter.maydell@linaro.org>,\n Gustavo Romero <gustavo.romero@linaro.org>,\n Richard Henderson <richard.henderson@linaro.org>, qemu-arm@nongnu.org,\n Laurent Vivier <laurent@vivier.eu>,\n Gabriel Brookman <brookmangabriel@gmail.com>, Helge Deller <deller@gmx.de>,\n Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>,\n Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>", "X-Mailer": "b4 0.15.2", "X-Developer-Signature": "v=1; a=ed25519-sha256; t=1777909867; l=3109;\n i=brookmangabriel@gmail.com; s=20251009; h=from:subject:message-id;\n bh=i7naSFKtsdz7oJ/mLAV3eXUKurGnggfA0UJX9vwXyVE=;\n b=beRiuMoGUh2trILB0UOertQUMc/zy6fknjcq7gSUZHgKun0WCnuuWwBVfNhaJW7+EirEeH2lY\n 1/4idKjmpHAD3FtHMGyqprB+YkcsbXSUDzwf8gwybtQgDXPwEG13OfQ", "X-Developer-Key": "i=brookmangabriel@gmail.com; a=ed25519;\n pk=m9TtPDal6WzoHNnQiHHKf8dTrv3DUCPUUTujuo8vNrw=", "Received-SPF": "pass client-ip=2607:f8b0:4864:20::82f;\n envelope-from=brookmangabriel@gmail.com; helo=mail-qt1-x82f.google.com", "X-Spam_score_int": "-10", "X-Spam_score": "-1.1", "X-Spam_bar": "-", "X-Spam_report": "(-1.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FORGED_GMAIL_RCVD=1,\n FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=no autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "As described in the section on MTX, tag bits should not be used to store\nor compute the PAC when MTX is set. See also Authenticate(),\nInsertPAC(), and Strip().\n\nSigned-off-by: Gabriel Brookman <brookmangabriel@gmail.com>\n---\n target/arm/internals.h | 12 +++++++++++-\n target/arm/tcg/pauth_helper.c | 18 +++++++++++++++++-\n 2 files changed, 28 insertions(+), 2 deletions(-)", "diff": "diff --git a/target/arm/internals.h b/target/arm/internals.h\nindex d313d36603..31b7e1c85e 100644\n--- a/target/arm/internals.h\n+++ b/target/arm/internals.h\n@@ -1809,7 +1809,17 @@ static inline uint64_t pauth_ptr_mask(ARMVAParameters param)\n int bot_pac_bit = 64 - param.tsz;\n int top_pac_bit = 64 - 8 * param.tbi;\n \n- return MAKE_64BIT_MASK(bot_pac_bit, top_pac_bit - bot_pac_bit);\n+ uint64_t mask = MAKE_64BIT_MASK(bot_pac_bit, top_pac_bit - bot_pac_bit);\n+\n+ /*\n+ * If mtx is enabled, second nibble is not part of PAC. See\n+ * InsertPAC().\n+ */\n+ if (param.mtx) {\n+ mask &= ~MAKE_64BIT_MASK(56, 4);\n+ }\n+\n+ return mask;\n }\n \n /* Add the cpreg definitions for debug related system registers */\ndiff --git a/target/arm/tcg/pauth_helper.c b/target/arm/tcg/pauth_helper.c\nindex 67c0d59d9e..3d83ca4c3c 100644\n--- a/target/arm/tcg/pauth_helper.c\n+++ b/target/arm/tcg/pauth_helper.c\n@@ -342,9 +342,16 @@ static uint64_t pauth_addpac(CPUARMState *env, uint64_t ptr, uint64_t modifier,\n }\n \n /* Build a pointer with known good extension bits. */\n- top_bit = 64 - 8 * param.tbi;\n+ top_bit = 64 - 8 * (param.tbi || param.mtx);\n bot_bit = 64 - param.tsz;\n ext_ptr = deposit64(ptr, bot_bit, top_bit - bot_bit, ext);\n+ /*\n+ * If mtx is active but not tbi, then the top 4 bits are replaced with the\n+ * ext bit, while leaving bits 56-59 alone. See InsertPAC().\n+ */\n+ if (param.mtx && !param.tbi) {\n+ ext_ptr = deposit64(ext_ptr, 60, 4, ext);\n+ }\n \n pac = pauth_computepac(env, ext_ptr, modifier, *key);\n \n@@ -377,6 +384,11 @@ static uint64_t pauth_addpac(CPUARMState *env, uint64_t ptr, uint64_t modifier,\n if (param.tbi) {\n ptr &= ~MAKE_64BIT_MASK(bot_bit, 55 - bot_bit + 1);\n pac &= MAKE_64BIT_MASK(bot_bit, 54 - bot_bit + 1);\n+ } else if (param.mtx) {\n+ ptr &= ~(MAKE_64BIT_MASK(60, 4) |\n+ MAKE_64BIT_MASK(bot_bit, 55 - bot_bit + 1));\n+ pac &= MAKE_64BIT_MASK(60, 4) |\n+ MAKE_64BIT_MASK(bot_bit, 54 - bot_bit + 1);\n } else {\n ptr &= MAKE_64BIT_MASK(0, bot_bit);\n pac &= ~(MAKE_64BIT_MASK(55, 1) | MAKE_64BIT_MASK(0, bot_bit));\n@@ -424,6 +436,10 @@ static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier,\n cmp_mask = MAKE_64BIT_MASK(bot_bit, top_bit - bot_bit);\n cmp_mask &= ~MAKE_64BIT_MASK(55, 1);\n \n+ if (param.mtx) {\n+ cmp_mask &= ~MAKE_64BIT_MASK(56, 4);\n+ }\n+\n if (pauth_feature >= PauthFeat_2) {\n ARMPauthFeature fault_feature =\n is_combined ? PauthFeat_FPACCOMBINED : PauthFeat_FPAC;\n", "prefixes": [ "v5", "12/15" ] }