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GET /api/patches/2220203/?format=api
{ "id": 2220203, "url": "http://patchwork.ozlabs.org/api/patches/2220203/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260406154935.144674-7-djordje.todorovic@htecgroup.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/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": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260406154935.144674-7-djordje.todorovic@htecgroup.com>", "list_archive_url": null, "date": "2026-04-06T15:49:42", "name": "[v6,6/7] target/riscv: Fix page table walk endianness for big-endian harts", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "6bf9d371901936c1761fae33dd4ac76c90d33921", "submitter": { "id": 90738, "url": "http://patchwork.ozlabs.org/api/people/90738/?format=api", "name": "Djordje Todorovic", "email": "Djordje.Todorovic@htecgroup.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260406154935.144674-7-djordje.todorovic@htecgroup.com/mbox/", "series": [ { "id": 498877, "url": "http://patchwork.ozlabs.org/api/series/498877/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=498877", "date": "2026-04-06T15:49:42", "name": "Add RISC-V big-endian target support", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/498877/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220203/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220203/checks/", "tags": {}, "related": [], "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=htecgroup.com header.i=@htecgroup.com\n header.a=rsa-sha256 header.s=selector1 header.b=njA1Q5Am;\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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a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com;\n s=arcselector10001;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1;\n bh=TVlOz68TH6Rn29Kd8vfhWLfqyIhG54uGQnnB6efYGDo=;\n b=ADixOhDhJ9ExIMkg0VIcMqQEIIVmzu1hjdmJtvArH2cxT2gaNvAz+HKTXonWTtWMX5d6DnckgIRNwJPBG0lBwmR3U7sF2amiYDVusv51DMVpA3kkS8AJGIn9Fbq1XGglspWawL8rwRML/EPCBiq4tvFfZS2cPL01RMAQA0jsRJlLt27N+ENSM0vGOyCJFrJU3yL7nAisRxFCIc7Ek2xEu86Y8/q0X0Jhdsw8UPGhpEFZvy+Z2M/c96PEhSqzkn7Xc3aqCivoI38DV+9Cqy/nyDpD4ym4wtIUqu+8Mb0Gm6NINoZ3obqPL0Gl2pRZVi32micnE/na+r4kFPrX66VJ1g==", "ARC-Authentication-Results": "i=1; mx.microsoft.com 1; spf=pass\n smtp.mailfrom=htecgroup.com; dmarc=pass action=none\n header.from=htecgroup.com; dkim=pass header.d=htecgroup.com; arc=none", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=htecgroup.com;\n s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=TVlOz68TH6Rn29Kd8vfhWLfqyIhG54uGQnnB6efYGDo=;\n b=njA1Q5AmDDSM528ByVtg3kiBYa6ZdUpXThvX6TXrNp/A3ID/Io8O+a5ed9DXAN95tC54gYhdFoDtXK6EQAqpNCINTsy4b5VjaUIgxydrlNa7UqMLnOUkcJxpGrGCTdBo6Hw3yTHCYwZDRs2/SMmILBh3BGbEtNzh5BWTMBWSIthEckxWRAS9tJ/GUI1jjGHwu+fUlOAVj07Al+ifPy+MzEkbkfh7ggetu24EiO366cxeNOawKwQb7l+D0oZNJe0M4TwHZ3yZQvblmnffZVIEK4O5RVVNdas9GZBmY1vm948zW38bRNIYbvcPTpze2tEwjFgiVE9br1EcNbSq/++vOg==", "From": "Djordje Todorovic <Djordje.Todorovic@htecgroup.com>", "To": "\"qemu-devel@nongnu.org\" <qemu-devel@nongnu.org>", "CC": "\"qemu-riscv@nongnu.org\" <qemu-riscv@nongnu.org>, \"cfu@mips.com\"\n <cfu@mips.com>, \"mst@redhat.com\" <mst@redhat.com>,\n \"marcel.apfelbaum@gmail.com\" <marcel.apfelbaum@gmail.com>,\n \"dbarboza@ventanamicro.com\" <dbarboza@ventanamicro.com>, \"philmd@linaro.org\"\n <philmd@linaro.org>, \"alistair23@gmail.com\" <alistair23@gmail.com>,\n \"thuth@redhat.com\" <thuth@redhat.com>, Djordje Todorovic\n <Djordje.Todorovic@htecgroup.com>", "Subject": "[PATCH v6 6/7] target/riscv: Fix page table walk endianness for\n big-endian harts", "Thread-Topic": "[PATCH v6 6/7] target/riscv: Fix page table walk endianness for\n big-endian harts", "Thread-Index": "AQHcxdz85GQ32f8AqkK1O7gP1A+/Sw==", "Date": "Mon, 6 Apr 2026 15:49:42 +0000", "Message-ID": "<20260406154935.144674-7-djordje.todorovic@htecgroup.com>", "References": "<20260406154935.144674-1-djordje.todorovic@htecgroup.com>", "In-Reply-To": "<20260406154935.144674-1-djordje.todorovic@htecgroup.com>", "Accept-Language": "en-US", "Content-Language": "en-US", "X-MS-Has-Attach": "", "X-MS-TNEF-Correlator": "", "authentication-results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=htecgroup.com header.i=@htecgroup.com\n header.a=rsa-sha256 header.s=selector1 header.b=njA1Q5Am;\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-ID": "<38ECEEB28EE1694497EBA60BAE2F0E3C@eurprd09.prod.outlook.com>", "Content-Transfer-Encoding": "base64", "MIME-Version": "1.0", "X-OriginatorOrg": "htecgroup.com", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-AuthSource": "GV2PR09MB8755.eurprd09.prod.outlook.com", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n c70ab610-5457-410e-69a2-08de93f41f0b", "X-MS-Exchange-CrossTenant-originalarrivaltime": "06 Apr 2026 15:49:42.7849 (UTC)", "X-MS-Exchange-CrossTenant-fromentityheader": "Hosted", "X-MS-Exchange-CrossTenant-id": "9f85665b-7efd-4776-9dfe-b6bfda2565ee", "X-MS-Exchange-CrossTenant-mailboxtype": "HOSTED", "X-MS-Exchange-CrossTenant-userprincipalname": "\n JKbsZGYypgozre9bIZUfcvQWuggvu7rF2w2Twl4WB4ZpV99YB3uieBLXQcfHHGRE5WHKKUVSrq5iTAPu0vTgIcSKHz6+yAszca6eqBpGSyU=", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "VI1PR09MB6903", "Received-SPF": "pass client-ip=2a01:111:f403:c202::7;\n envelope-from=Djordje.Todorovic@htecgroup.com;\n helo=GVXPR05CU001.outbound.protection.outlook.com", "X-Spam_score_int": "-20", "X-Spam_score": "-2.1", "X-Spam_bar": "--", "X-Spam_report": "(-2.1 / 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, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham 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": "The page table walker reads PTEs using address_space_ldl/ldq which use\ncompile-time native endianness (always LE for RISC-V). However, when a\nbig-endian kernel writes PTEs via normal store instructions, they are\nstored in big-endian byte order. The walker then misinterprets the PTE\nvalues, causing page faults and a hang when the kernel enables the MMU.\n\nThe RISC-V privileged specification states that implicit data memory\naccesses to supervisor-level memory management data structures follow\nthe hart's endianness setting (MSTATUS SBE/MBE bits).\n\nFix both PTE reads and atomic A/D bit updates to use the explicit _le\nor _be memory access variants based on the hart's runtime endianness.\n\nSigned-off-by: Djordje Todorovic <djordje.todorovic@htecgroup.com>\nReviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>\n---\n target/riscv/cpu_helper.c | 28 ++++++++++++++++++++++------\n 1 file changed, 22 insertions(+), 6 deletions(-)", "diff": "diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c\r\nindex c28832e0e3..b3d33da13e 100644\r\n--- a/target/riscv/cpu_helper.c\r\n+++ b/target/riscv/cpu_helper.c\r\n@@ -1365,9 +1365,13 @@ static int get_physical_address(CPURISCVState *env, hwaddr *physical,\r\n }\r\n \r\n if (riscv_cpu_mxl(env) == MXL_RV32) {\r\n- pte = address_space_ldl_le(cs->as, pte_addr, attrs, &res);\r\n+ pte = riscv_cpu_data_is_big_endian(env)\r\n+ ? address_space_ldl_be(cs->as, pte_addr, attrs, &res)\r\n+ : address_space_ldl_le(cs->as, pte_addr, attrs, &res);\r\n } else {\r\n- pte = address_space_ldq_le(cs->as, pte_addr, attrs, &res);\r\n+ pte = riscv_cpu_data_is_big_endian(env)\r\n+ ? address_space_ldq_be(cs->as, pte_addr, attrs, &res)\r\n+ : address_space_ldq_le(cs->as, pte_addr, attrs, &res);\r\n }\r\n \r\n if (res != MEMTX_OK) {\r\n@@ -1566,12 +1570,24 @@ static int get_physical_address(CPURISCVState *env, hwaddr *physical,\r\n if (memory_region_is_ram(mr)) {\r\n target_ulong *pte_pa = qemu_map_ram_ptr(mr->ram_block, addr1);\r\n target_ulong old_pte;\r\n+ bool be = riscv_cpu_data_is_big_endian(env);\r\n if (riscv_cpu_sxl(env) == MXL_RV32) {\r\n- old_pte = qatomic_cmpxchg((uint32_t *)pte_pa, cpu_to_le32(pte), cpu_to_le32(updated_pte));\r\n- old_pte = le32_to_cpu(old_pte);\r\n+ uint32_t cmp = be ? cpu_to_be32(pte)\r\n+ : cpu_to_le32(pte);\r\n+ uint32_t val = be ? cpu_to_be32(updated_pte)\r\n+ : cpu_to_le32(updated_pte);\r\n+ old_pte = qatomic_cmpxchg((uint32_t *)pte_pa,\r\n+ cmp, val);\r\n+ old_pte = be ? be32_to_cpu(old_pte)\r\n+ : le32_to_cpu(old_pte);\r\n } else {\r\n- old_pte = qatomic_cmpxchg(pte_pa, cpu_to_le64(pte), cpu_to_le64(updated_pte));\r\n- old_pte = le64_to_cpu(old_pte);\r\n+ target_ulong cmp = be ? cpu_to_be64(pte)\r\n+ : cpu_to_le64(pte);\r\n+ target_ulong val = be ? cpu_to_be64(updated_pte)\r\n+ : cpu_to_le64(updated_pte);\r\n+ old_pte = qatomic_cmpxchg(pte_pa, cmp, val);\r\n+ old_pte = be ? be64_to_cpu(old_pte)\r\n+ : le64_to_cpu(old_pte);\r\n }\r\n if (old_pte != pte) {\r\n goto restart;\r\n", "prefixes": [ "v6", "6/7" ] }