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GET /api/1.1/patches/2232515/?format=api
{ "id": 2232515, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2232515/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260504-feat-mte4-v5-7-232a648e63c6@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-v5-7-232a648e63c6@gmail.com>", "date": "2026-05-04T15:50:40", "name": "[v5,07/15] target/arm: add canonical tag check, mtx helpers", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "0d6022f9b6ffdf2913c328f2eeb4ec95308e5e44", "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-v5-7-232a648e63c6@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/2232515/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2232515/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=jpwFhAQA;\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-v5-7-232a648e63c6@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=1931;\n i=brookmangabriel@gmail.com; s=20251009; h=from:subject:message-id;\n bh=jN08kl5XFA9CgTscW9ExtHRwdhxwVdpjf5wqgUQUKtk=;\n b=WqGzwxpPuHocytpfhoh8lD7CZ/MuIC67VGaB9ynLdUiRiOcFSfl5c2s3SCyWcOOaP9d1RpNl6\n +ouCCAjjmCPAIHNCUBGvzQyPsLMalFgOshfYl3mACOX8DgU130ZPcsA", "X-Developer-Key": "i=brookmangabriel@gmail.com; a=ed25519;\n pk=m9TtPDal6WzoHNnQiHHKf8dTrv3DUCPUUTujuo8vNrw=", "Received-SPF": "pass client-ip=2607:f8b0:4864:20::829;\n envelope-from=brookmangabriel@gmail.com; helo=mail-qt1-x829.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": "Add a helper that checks whether mtx is active from MTEDESC and a\nhelper that checks whether a tag matches the selector bit. These\nhelpers will be used for the subsequent commits.\n\nSigned-off-by: Gabriel Brookman <brookmangabriel@gmail.com>\n---\n target/arm/internals.h | 14 +++++++++++++-\n 1 file changed, 13 insertions(+), 1 deletion(-)", "diff": "diff --git a/target/arm/internals.h b/target/arm/internals.h\nindex 6df2c547c5..779eafabc8 100644\n--- a/target/arm/internals.h\n+++ b/target/arm/internals.h\n@@ -1629,6 +1629,12 @@ static inline uint64_t address_with_allocation_tag(uint64_t ptr, int rtag)\n return deposit64(ptr, 56, 4, rtag);\n }\n \n+/* Return true if mtx bits mean that the access is canonically checked. */\n+static inline bool mtx_check(uint32_t desc, int bit55)\n+{\n+ return (desc >> (R_MTEDESC_MTX_SHIFT + bit55)) & 1;\n+}\n+\n /* Return true if tbi or mtx bits mean that the access is tag checked. */\n static inline bool tbi_or_mtx_check(uint32_t desc, int bit55)\n {\n@@ -1636,6 +1642,12 @@ static inline bool tbi_or_mtx_check(uint32_t desc, int bit55)\n return desc & (mask << bit55);\n }\n \n+/* Return whether or not the second nibble of a VA matches bit 55. */\n+static inline bool tag_is_canonical(int ptr_tag, int bit55)\n+{\n+ return ((ptr_tag + bit55) & 0xf) == 0;\n+}\n+\n /* Return true if tcma bits mean that the access is unchecked. */\n static inline bool tcma_check(uint32_t desc, int bit55, int ptr_tag)\n {\n@@ -1643,7 +1655,7 @@ static inline bool tcma_check(uint32_t desc, int bit55, int ptr_tag)\n * We had extracted bit55 and ptr_tag for other reasons, so fold\n * (ptr<59:55> == 00000 || ptr<59:55> == 11111) into a single test.\n */\n- bool match = ((ptr_tag + bit55) & 0xf) == 0;\n+ bool match = tag_is_canonical(ptr_tag, bit55);\n bool tcma = (desc >> (R_MTEDESC_TCMA_SHIFT + bit55)) & 1;\n return tcma && match;\n }\n", "prefixes": [ "v5", "07/15" ] }