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GET /api/patches/2216022/?format=api
{ "id": 2216022, "url": "http://patchwork.ozlabs.org/api/patches/2216022/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260325164453.72127-15-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": "<20260325164453.72127-15-pbonzini@redhat.com>", "list_archive_url": null, "date": "2026-03-25T16:44:48", "name": "[PULL,14/19] whpx: i386: fetch segments on-demand", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "41fab9c5edcc5b33c7840783a84484a6aefbf7da", "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/20260325164453.72127-15-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/2216022/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216022/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) header.d=redhat.com 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Rkjgts1ADn4F7iFuQ3TGNCka+fPqt6FOm/+d833E0JFDeM7RYsN4NxZ4xNjdPz2WuuBLmSfGukG\n onRgnsBknf51PXOKfnRAdpYygY", "X-Received": [ "by 2002:a05:600c:8489:b0:485:6e40:5584 with SMTP id\n 5b1f17b1804b1-48715fc38femr60002615e9.6.1774457121826;\n Wed, 25 Mar 2026 09:45:21 -0700 (PDT)", "by 2002:a05:600c:8489:b0:485:6e40:5584 with SMTP id\n 5b1f17b1804b1-48715fc38femr60002095e9.6.1774457121265;\n Wed, 25 Mar 2026 09:45:21 -0700 (PDT)" ], "From": "Paolo Bonzini <pbonzini@redhat.com>", "To": "qemu-devel@nongnu.org", "Cc": "Mohamed Mediouni <mohamed@unpredictable.fr>", "Subject": "[PULL 14/19] whpx: i386: fetch segments on-demand", "Date": "Wed, 25 Mar 2026 17:44:48 +0100", "Message-ID": "<20260325164453.72127-15-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\nInstead of save/restore, fetch segments dynamically.\n\nRely on the fetched state instead of loading from memory.\n\nOr, if available, on the VM exit context.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\nLink: https://lore.kernel.org/r/20260324151323.74473-12-mohamed@unpredictable.fr\nSigned-off-by: Paolo Bonzini <pbonzini@redhat.com>\n---\n target/i386/whpx/whpx-all.c | 71 +++++++++++++++++++++++++++++++------\n 1 file changed, 60 insertions(+), 11 deletions(-)", "diff": "diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 71b33a632ac..6f232786422 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -868,21 +868,70 @@ static int whpx_handle_portio(CPUState *cpu,\n return 0;\n }\n \n+static void whpx_segment_to_x86_descriptor(CPUState *cpu, WHV_X64_SEGMENT_REGISTER* reg,\n+ struct x86_segment_descriptor *desc)\n+{\n+ uint32_t limit;\n+ desc->g = reg->Granularity;\n+\n+ /*\n+ * Hyper-V can return reg->Granularity == 0\n+ * with a higher limit than 0xfffff.\n+ *\n+ * Detect that case and set desc->g\n+ * with shifting the limit properly.\n+ */\n+ if (!desc->g && reg->Limit <= 0xfffff) {\n+ limit = reg->Limit;\n+ } else {\n+ limit = (reg->Limit >> 12);\n+ desc->g = 1;\n+ }\n+\n+ x86_set_segment_limit(desc, limit);\n+ x86_set_segment_base(desc, reg->Base);\n+\n+ desc->type = reg->SegmentType;\n+ desc->s = reg->NonSystemSegment;\n+ desc->dpl = reg->DescriptorPrivilegeLevel;\n+ desc->p = reg->Present;\n+ desc->avl = reg->Available;\n+ desc->l = reg->Long;\n+ desc->db = reg->Default;\n+}\n+\n+static void whpx_read_segment_descriptor(CPUState *cpu, WHV_X64_SEGMENT_REGISTER* reg,\n+ X86Seg seg)\n+{\n+ AccelCPUState *vcpu = cpu->accel;\n+ WHV_REGISTER_NAME reg_name = WHvX64RegisterEs + seg;\n+ WHV_REGISTER_VALUE val;\n+\n+ if (seg == R_CS) {\n+ *reg = vcpu->exit_ctx.VpContext.Cs;\n+ return;\n+ }\n+ if (vcpu->exit_ctx.ExitReason == WHvRunVpExitReasonX64IoPortAccess) {\n+ if (seg == R_DS) {\n+ *reg = vcpu->exit_ctx.IoPortAccess.Ds;\n+ return;\n+ } else if (seg == R_ES) {\n+ *reg = vcpu->exit_ctx.IoPortAccess.Es;\n+ return;\n+ }\n+ }\n+\n+ whpx_get_reg(cpu, reg_name, &val);\n+ *reg = val.Segment;\n+}\n+\n static void read_segment_descriptor(CPUState *cpu,\n struct x86_segment_descriptor *desc,\n enum X86Seg seg_idx)\n {\n- bool ret;\n- X86CPU *x86_cpu = X86_CPU(cpu);\n- CPUX86State *env = &x86_cpu->env;\n- SegmentCache *seg = &env->segs[seg_idx];\n- x86_segment_selector sel = { .sel = seg->selector & 0xFFFF };\n-\n- ret = x86_read_segment_descriptor(cpu, desc, sel);\n- if (ret == false) {\n- error_report(\"failed to read segment descriptor\");\n- abort();\n- }\n+ WHV_X64_SEGMENT_REGISTER reg;\n+ whpx_read_segment_descriptor(cpu, ®, seg_idx);\n+ whpx_segment_to_x86_descriptor(cpu, ®, desc);\n }\n \n static bool is_protected_mode(CPUState *cpu)\n", "prefixes": [ "PULL", "14/19" ] }