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GET /api/1.1/patches/2228812/?format=api
{ "id": 2228812, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2228812/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260427051507.727280-2-314abh@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": "<20260427051507.727280-2-314abh@gmail.com>", "date": "2026-04-27T05:15:07", "name": "[1/1] target/riscv: Fix medeleg[11] read-only zero bit for M-mode ECALL", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c51c7882732bac9d9dd26fd21fe2886c99b4841e", "submitter": { "id": 93260, "url": "http://patchwork.ozlabs.org/api/1.1/people/93260/?format=api", "name": "Abhigyan Kumar", "email": "314abh@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260427051507.727280-2-314abh@gmail.com/mbox/", "series": [ { "id": 501641, "url": "http://patchwork.ozlabs.org/api/1.1/series/501641/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501641", "date": "2026-04-27T05:15:06", "name": "target/riscv: Fix medeleg[11] read-only zero bit for M-mode ECALL", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/501641/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2228812/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2228812/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=sjEElzvB;\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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helo=mail-pf1-x42a.google.com", "X-Spam_score_int": "-13", "X-Spam_score": "-1.4", "X-Spam_bar": "-", "X-Spam_report": "(-1.4 / 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, FREEMAIL_FROM=0.001,\n FROM_STARTS_WITH_NUMS=0.738, 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-Mailman-Approved-At": "Mon, 27 Apr 2026 08:47:18 -0400", "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": "RISC-V Privileged Specification 3.1.8 (Machine Trap Delegation Registers\n(medeleg and mideleg)) mentions:\n\n\"For exceptions that cannot occur in less privileged modes, the\ncorresponding medeleg bits should be read-only zero. In particular,\nmedeleg[11] is read-only zero.\"\n\nQEMU incorrectly included RISCV_EXCP_M_ECALL in DELEGABLE_EXCPS. It\nallowed the 11th bit to be written and read as set. Fixed by removing it\nfrom the DELEGABLE_EXCPS mask, adhering to the specification.\n\nResolves: https://gitlab.com/qemu-project/qemu/-/work_items/3438\nSigned-off-by: Abhigyan Kumar <314abh@gmail.com>\n---\n target/riscv/csr.c | 5 ++++-\n 1 file changed, 4 insertions(+), 1 deletion(-)", "diff": "diff --git a/target/riscv/csr.c b/target/riscv/csr.c\nindex a75281539..c9bf73dd7 100644\n--- a/target/riscv/csr.c\n+++ b/target/riscv/csr.c\n@@ -1775,6 +1775,10 @@ static const uint64_t vs_delegable_ints =\n (VS_MODE_INTERRUPTS | LOCAL_INTERRUPTS) & ~MIP_LCOFIP;\n static const uint64_t all_ints = M_MODE_INTERRUPTS | S_MODE_INTERRUPTS |\n HS_MODE_INTERRUPTS | LOCAL_INTERRUPTS;\n+/* \n+ * As per RSIC-V Privileged Spec Section 3.1.8, M-mode ecall should be a\n+ * read-only zero. Therefore, medeleg[11] is set to zero below. \n+ */\n #define DELEGABLE_EXCPS ((1ULL << (RISCV_EXCP_INST_ADDR_MIS)) | \\\n (1ULL << (RISCV_EXCP_INST_ACCESS_FAULT)) | \\\n (1ULL << (RISCV_EXCP_ILLEGAL_INST)) | \\\n@@ -1786,7 +1790,6 @@ static const uint64_t all_ints = M_MODE_INTERRUPTS | S_MODE_INTERRUPTS |\n (1ULL << (RISCV_EXCP_U_ECALL)) | \\\n (1ULL << (RISCV_EXCP_S_ECALL)) | \\\n (1ULL << (RISCV_EXCP_VS_ECALL)) | \\\n- (1ULL << (RISCV_EXCP_M_ECALL)) | \\\n (1ULL << (RISCV_EXCP_INST_PAGE_FAULT)) | \\\n (1ULL << (RISCV_EXCP_LOAD_PAGE_FAULT)) | \\\n (1ULL << (RISCV_EXCP_STORE_PAGE_FAULT)) | \\\n", "prefixes": [ "1/1" ] }