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GET /api/patches/2215426/?format=api
{ "id": 2215426, "url": "http://patchwork.ozlabs.org/api/patches/2215426/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260324151323.74473-12-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": "<20260324151323.74473-12-mohamed@unpredictable.fr>", "list_archive_url": null, "date": "2026-03-24T15:13:22", "name": "[v3,11/12] whpx: i386: fetch segments on-demand", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "41fab9c5edcc5b33c7840783a84484a6aefbf7da", "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/20260324151323.74473-12-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/2215426/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2215426/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=TZLuxECw;\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 11:14:46 -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 6D409183533B; Tue, 24 Mar 2026 15:14:38 +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 855C418014A9; Tue, 24 Mar 2026 15:13:56 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1774365281; x=1776957281;\n bh=eaxFbDbhOhjNq2FXCuR8YCCB4ResW+p9AOTyVZ7pRBM=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=TZLuxECwUf65dPtY/UeVvllu3dtO6qrTrkXk7jLTXD6jgzVJgHXWBPTS64dqZq1of/0wUjThr/tziRS5Y41233xjDGUTboBdip18yKr5xyYD0uXMXRKklIk0xNS20XSFWQ4gAakNhujppSwjbDOxuLACioI8CMPOFLGancA3sgmwhvTaN/CRt/wsWRSYPrOlqXZQsUDjJ8V6LBfFp8xVtEdG42wD7XK5bMuB2DBl3FqChOUQghz3WW3Co81cV1p6DnP+zMpRDPFLMHQsdSe7pqJrpKRdy3YCLe+9F8vCCr/mNDPd9ywUokTg3ZFRnI69zgtD8LwDkmYunhbts1He+g==", "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 11/12] whpx: i386: fetch segments on-demand", "Date": "Tue, 24 Mar 2026 16:13:22 +0100", "Message-ID": "<20260324151323.74473-12-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-Authority-Info-Out": "v=2.4 cv=cqWWUl4i c=1 sm=1 tr=0 ts=69c2aa5f\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=dLhstIsYVbaQZ-P_MTUA:9", "X-Proofpoint-GUID": "j9m_XXPfehx_MaDjj0qXH28n0o0_zWQ_", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMzI0MDExOSBTYWx0ZWRfX7JJnZCx+eXMu\n GLHM7KPCjgQk+76KwLp37gpkDjwzdlZYlz2JGqT4L+qwCUwef4TV/3kT9aLmG6b8OlB84PFeIyG\n AJnTNwit9EXS6vpe6L5qy3EBg4GLqlxXkSf6giPKoOQ8Wt48Ysq3gYSPp6/GdvR2jO3UMABSjmX\n uHrn8DPjfHL6pkn8mmfcav5nNFZI14QSgoO4uCsFdMIuvEcw0NDpaBJU0dRSUUMD2CXOuJGvptY\n 1Np6GjNS3eBcmeu9J2NKbba664w2WVw8vO/8yqcg2tTVSsZPXgB4ZglPI5usK/ZQ0sydhnd5rC+\n hFpC4sHXKswX87WogTr6WFSss5zRC4AjB8uBr2gTdqqNcvZKzpbGW1AhBDXsZE=", "X-Proofpoint-ORIG-GUID": "j9m_XXPfehx_MaDjj0qXH28n0o0_zWQ_", "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 bulkscore=0\n lowpriorityscore=0 mlxlogscore=883 malwarescore=0 adultscore=0 clxscore=1030\n mlxscore=0 suspectscore=0 spamscore=0 phishscore=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=57.103.78.11;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.st.icloud.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,\n RCVD_IN_MSPIKE_H2=0.001, 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": "Instead 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>\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 71b33a632a..6f23278642 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": [ "v3", "11/12" ] }