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GET /api/patches/2215427/?format=api
{ "id": 2215427, "url": "http://patchwork.ozlabs.org/api/patches/2215427/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260324151323.74473-11-mohamed@unpredictable.fr/", "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": "<20260324151323.74473-11-mohamed@unpredictable.fr>", "list_archive_url": null, "date": "2026-03-24T15:13:21", "name": "[v3,10/12] target/i386: emulate: segmentation rework", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "559464fcbdb05f9d3b4030dad4c157e4c0656287", "submitter": { "id": 91318, "url": "http://patchwork.ozlabs.org/api/people/91318/?format=api", "name": "Mohamed Mediouni", "email": "mohamed@unpredictable.fr" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260324151323.74473-11-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 497303, "url": "http://patchwork.ozlabs.org/api/series/497303/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=497303", "date": "2026-03-24T15:13:13", "name": "whpx: i386: Windows 10 and performance fixes", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/497303/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2215427/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2215427/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=unpredictable.fr header.i=@unpredictable.fr\n header.a=rsa-sha256 header.s=sig1 header.b=eEZLsnY4;\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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Tue, 24 Mar 2026 11:14:51 -0400", "from outbound.st.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-east-1a-60-percent-7 (Postfix) with ESMTPS id\n 1A4E11800348; Tue, 24 Mar 2026 15:14:35 +0000 (UTC)", "from localhost.localdomain (unknown [17.42.251.67])\n by p00-icloudmta-asmtp-us-east-1a-60-percent-7 (Postfix) with ESMTPSA id\n ECE0718094D2; Tue, 24 Mar 2026 15:13:54 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1774365276; x=1776957276;\n bh=vl9gr3/Etwc2CL3Gr9sJC1zQGi6Rjmv81TXMHG3rpEg=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=eEZLsnY4V+sml3LuUNQkmqyIvf9YdO2d8oLs3e/zq53PUPLG0z2RLE68ebPmln6teg33CEK4JdvfNHh7gr0PxNPN1OZEyedC8t73qjgRy2Twlr8P2yQ1/Ekj6jFC2PQE1js7AAzXnvtPgjmfJ1/QXs04iC/TpYwEAYMmqTSm/howrTQ3jP6SSliMV/oDXigI/VElpbYpkMGMWFLmXnbPH1zRXl/SItG+n6d6IJHORC5klpJK7JQqX76FIFGOy3BO6pP3rOnE9HcHQ+TIDtDijyl9Mp431p0yUAG5ObJiFe84wbchom0+qsSo5vSBxxbkEViwW4l/wepD5nLWJt1KRg==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Roman Bolshakov <rbolshakov@ddn.com>,\n Mohamed Mediouni <mohamed@unpredictable.fr>, Wei Liu <wei.liu@kernel.org>,\n Phil Dennis-Jordan <phil@philjordan.eu>,\n Pedro Barbuda <pbarbuda@microsoft.com>", "Subject": "[PATCH v3 10/12] target/i386: emulate: segmentation rework", "Date": "Tue, 24 Mar 2026 16:13:21 +0100", "Message-ID": "<20260324151323.74473-11-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260324151323.74473-1-mohamed@unpredictable.fr>", "References": "<20260324151323.74473-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Proofpoint-ORIG-GUID": "OPcY04fxywMQY_h8Bqromc5U6eDJEfiv", "X-Authority-Info-Out": "v=2.4 cv=bYRmkePB c=1 sm=1 tr=0 ts=69c2aa5c\n cx=c_apl:c_pps:t_out a=YrL12D//S6tul8v/L+6tKg==:117\n a=YrL12D//S6tul8v/L+6tKg==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=vJJf33RnEMvZLxG4ysEA:9", "X-Proofpoint-GUID": "OPcY04fxywMQY_h8Bqromc5U6eDJEfiv", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMzI0MDExOSBTYWx0ZWRfX8jbnFCHPqq4n\n 6P8xW1exmYdrXC1pSPyEU3hlBpQaAa83UzCX4XrrzQzajnzshNhOzK5HY/552XzTCh2spVLcjhj\n P4qZ7j4PRJYQjhtpw99IDQIQVC5XxUOJLjB+egwphNsPo6LW1zv23qLfW3q/nQ+H/gByVg5qLP/\n nn9jIQZyU2Y3TqHxoMMA/8LiZE/5bdIkX51ImYcVdMi424pPn4sbtsTrOM1d4qhCrBoP9ta7irz\n zJakLqoN8pnBJztxPwbqmIcztgXC/1ycC9bUp8PTUUALuObgcTMAXbh/Bpj75p3xA/ZkrUl/OPC\n 8EjYfpB3z9Fk9gAmvq623r3VHh+ldMqL/gnMrbxVQeD0k+LyTcMngXFT/wzFXo=", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-03-24_03,2026-03-23_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0 spamscore=0\n lowpriorityscore=0 adultscore=0 phishscore=0 bulkscore=0 malwarescore=0\n clxscore=1030 mlxlogscore=999 suspectscore=0 mlxscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2603240119", "Received-SPF": "pass client-ip=57.103.78.58;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.st.icloud.com", "X-Spam_score_int": "-27", "X-Spam_score": "-2.8", "X-Spam_bar": "--", "X-Spam_report": "(-2.8 / 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,\n RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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": "Make accesses to segments all go through read_segment_descriptor\nto be able to fetch segment state on-demand.\n\nSwitch away from SegmentCache to the x86_segment_descriptor\nthat is already used by read_segment_descriptor.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\n---\n target/i386/emulate/x86_helpers.c | 50 ++++++++++++-------------------\n 1 file changed, 19 insertions(+), 31 deletions(-)", "diff": "diff --git a/target/i386/emulate/x86_helpers.c b/target/i386/emulate/x86_helpers.c\nindex c817015ef9..63bae3582f 100644\n--- a/target/i386/emulate/x86_helpers.c\n+++ b/target/i386/emulate/x86_helpers.c\n@@ -43,49 +43,37 @@ static CpuMode cpu_mode(CPUState *cpu)\n return m;\n }\n \n-static bool segment_type_ro(const SegmentCache *seg)\n+static bool segment_type_ro(const x86_segment_descriptor desc)\n {\n- uint32_t type_ = (seg->flags >> DESC_TYPE_SHIFT) & 15;\n+ uint32_t type_ = desc.type;\n return (type_ & (~RWRX_SEGMENT_TYPE)) == 0;\n }\n \n-static bool segment_type_code(const SegmentCache *seg)\n+static bool segment_type_code(const x86_segment_descriptor desc)\n {\n- uint32_t type_ = (seg->flags >> DESC_TYPE_SHIFT) & 15;\n+ uint32_t type_ = desc.type;\n return (type_ & CODE_SEGMENT_TYPE) != 0;\n }\n \n-static bool segment_expands_down(const SegmentCache *seg)\n+static bool segment_expands_down(const x86_segment_descriptor desc)\n {\n- uint32_t type_ = (seg->flags >> DESC_TYPE_SHIFT) & 15;\n+ uint32_t type_ = desc.type;\n \n- if (segment_type_code(seg)) {\n+ if (segment_type_code(desc)) {\n return false;\n }\n \n return (type_ & EXPAND_DOWN_SEGMENT_TYPE) != 0;\n }\n \n-static uint32_t segment_limit(const SegmentCache *seg)\n+static uint8_t segment_db(const x86_segment_descriptor desc)\n {\n- uint32_t limit = seg->limit;\n- uint32_t granularity = (seg->flags & DESC_G_MASK) != 0;\n-\n- if (granularity != 0) {\n- limit = (limit << 12) | 0xFFF;\n- }\n-\n- return limit;\n+ return desc.db;\n }\n \n-static uint8_t segment_db(const SegmentCache *seg)\n+static uint32_t segment_max_limit(const x86_segment_descriptor desc)\n {\n- return (seg->flags >> DESC_B_SHIFT) & 1;\n-}\n-\n-static uint32_t segment_max_limit(const SegmentCache *seg)\n-{\n- if (segment_db(seg) != 0) {\n+ if (segment_db(desc) != 0) {\n return 0xFFFFFFFF;\n }\n return 0xFFFF;\n@@ -96,15 +84,15 @@ static int linearize(CPUState *cpu,\n X86Seg seg_idx)\n {\n enum CpuMode mode;\n- X86CPU *x86_cpu = X86_CPU(cpu);\n- CPUX86State *env = &x86_cpu->env;\n- SegmentCache *seg = &env->segs[seg_idx];\n- target_ulong base = seg->base;\n+ struct x86_segment_descriptor desc;\n+ target_ulong base;\n target_ulong logical_addr_32b;\n uint32_t limit;\n /* TODO: the emulator will not pass us \"write\" indicator yet */\n bool write = false;\n \n+ emul_ops->read_segment_descriptor(cpu, &desc, seg_idx);\n+ base = x86_segment_base(&desc);\n mode = cpu_mode(cpu);\n \n switch (mode) {\n@@ -116,21 +104,21 @@ static int linearize(CPUState *cpu,\n break;\n case PROTECTED_MODE:\n case REAL_MODE:\n- if (segment_type_ro(seg) && write) {\n+ if (segment_type_ro(desc) && write) {\n error_report(\"Cannot write to read-only segment\");\n return -1;\n }\n \n logical_addr_32b = logical_addr & 0xFFFFFFFF;\n- limit = segment_limit(seg);\n+ limit = x86_segment_limit(&desc);\n \n- if (segment_expands_down(seg)) {\n+ if (segment_expands_down(desc)) {\n if (logical_addr_32b >= limit) {\n error_report(\"Address exceeds limit (expands down)\");\n return -1;\n }\n \n- limit = segment_max_limit(seg);\n+ limit = segment_max_limit(desc);\n }\n \n if (logical_addr_32b > limit) {\n", "prefixes": [ "v3", "10/12" ] }