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GET /api/patches/2216021/?format=api
{ "id": 2216021, "url": "http://patchwork.ozlabs.org/api/patches/2216021/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260325164453.72127-14-pbonzini@redhat.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": "<20260325164453.72127-14-pbonzini@redhat.com>", "list_archive_url": null, "date": "2026-03-25T16:44:47", "name": "[PULL,13/19] target/i386: emulate: segmentation rework", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "559464fcbdb05f9d3b4030dad4c157e4c0656287", "submitter": { "id": 2701, "url": "http://patchwork.ozlabs.org/api/people/2701/?format=api", "name": "Paolo Bonzini", "email": "pbonzini@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260325164453.72127-14-pbonzini@redhat.com/mbox/", "series": [ { "id": 497473, "url": "http://patchwork.ozlabs.org/api/series/497473/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=497473", "date": "2026-03-25T16:44:34", "name": "[PULL,01/19] tests/functional: preserve PYTHONPATH entries", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497473/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216021/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216021/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 (1024-bit key;\n unprotected) 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9J24pbh85hFlh6dK9/Rwtl4f2S03fWdTtZ5YWQhxuu2O9K4GHwfN4tq4UjsmXljeMZXnvCQR6wo\n pOvJ//G6uJgWPE2xb0ura9fntAy6E9sgesCsGOOApPNbSM+6K+FHX6+oihn4tsZ8O44yeDMwGC6\n zqBmmvDi+8J3M2nbd6QeG1Q9Wd", "X-Received": [ "by 2002:a05:600c:3d90:b0:485:2a4b:7bc3 with SMTP id\n 5b1f17b1804b1-48715fc38f3mr62050785e9.4.1774457120733;\n Wed, 25 Mar 2026 09:45:20 -0700 (PDT)", "by 2002:a05:600c:3d90:b0:485:2a4b:7bc3 with SMTP id\n 5b1f17b1804b1-48715fc38f3mr62050135e9.4.1774457120072;\n Wed, 25 Mar 2026 09:45:20 -0700 (PDT)" ], "From": "Paolo Bonzini <pbonzini@redhat.com>", "To": "qemu-devel@nongnu.org", "Cc": "Mohamed Mediouni <mohamed@unpredictable.fr>", "Subject": "[PULL 13/19] target/i386: emulate: segmentation rework", "Date": "Wed, 25 Mar 2026 17:44:47 +0100", "Message-ID": "<20260325164453.72127-14-pbonzini@redhat.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260325164453.72127-1-pbonzini@redhat.com>", "References": "<20260325164453.72127-1-pbonzini@redhat.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=170.10.129.124;\n envelope-from=pbonzini@redhat.com;\n helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-0.001, 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": "From: Mohamed Mediouni <mohamed@unpredictable.fr>\n\nMake 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>\nLink: https://lore.kernel.org/r/20260324151323.74473-11-mohamed@unpredictable.fr\nSigned-off-by: Paolo Bonzini <pbonzini@redhat.com>\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 c817015ef92..63bae3582fe 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": [ "PULL", "13/19" ] }