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GET /api/patches/2196574/?format=api
{ "id": 2196574, "url": "http://patchwork.ozlabs.org/api/patches/2196574/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260215052225.22513-15-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": "<20260215052225.22513-15-mohamed@unpredictable.fr>", "list_archive_url": null, "date": "2026-02-15T05:22:25", "name": "[v3,14/14] whpx: i386: saving/restoring less state for WHPX_LEVEL_FAST_RUNTIME_STATE", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "fe096ea4ff4d83db5c6c6f5263509297033f1e56", "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/20260215052225.22513-15-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 492201, "url": "http://patchwork.ozlabs.org/api/series/492201/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=492201", "date": "2026-02-15T05:22:12", "name": "whpx: x86 updates (2026-02)", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/492201/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196574/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196574/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=dUq7asuw;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fDDrZ1kGyz1xpY\n\tfor <incoming@patchwork.ozlabs.org>; Sun, 15 Feb 2026 16:25:34 +1100 (AEDT)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1vrUbQ-0000Vh-Nx; Sun, 15 Feb 2026 00:23:28 -0500", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <mohamed@unpredictable.fr>)\n id 1vrUbN-0000TL-1D\n for qemu-devel@nongnu.org; Sun, 15 Feb 2026 00:23:25 -0500", "from p-west2-cluster1-host5-snip4-10.eps.apple.com ([57.103.68.53]\n helo=outbound.mr.icloud.com)\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <mohamed@unpredictable.fr>)\n id 1vrUbL-0004w3-H7\n for qemu-devel@nongnu.org; Sun, 15 Feb 2026 00:23:24 -0500", "from outbound.mr.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-west-2a-60-percent-1 (Postfix) with ESMTPS id\n 0A4C81800094; Sun, 15 Feb 2026 05:23:20 +0000 (UTC)", "from localhost.localdomain (unknown [17.57.152.38])\n by p00-icloudmta-asmtp-us-west-2a-60-percent-1 (Postfix) with ESMTPSA id\n 8B0E31800139; Sun, 15 Feb 2026 05:23:17 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1771133002; x=1773725002;\n bh=GLbIgTGdGVhANWp4nd6TkdA9/AvSuGt0b680ukLmQR4=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=dUq7asuwUjHsZI/S+ujKW4nOEl3DRq7oqXpzxBPICqQ1x7bvyCijjb1lAyQdJ/30NVTKXM9Y7bISYozZLZJL5IcbKdLcjn16XWm6mkstz/7Lwe55lKunaC9UtcMT1ByLEur8eACufCB5UxmnS7duFEXpmpfQhj4cLnibGIagrs2GGfl7uESQ2Ac+ViwhiXHN2HmFCFZisbnHL41EZTKbEoct00sYiOt1H/uWgKmz/0alRWQcSPT373xmAj1M+3KT+KwzxsfglL+wiFNZsWeOO7TpADJNcN1IqThZeWOqXFpUPfAASz09GoHBtrIbCSetcsDX191uhJYacQ+g0A7f5A==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Phil Dennis-Jordan <phil@philjordan.eu>,\n Bernhard Beschow <shentey@gmail.com>, Cameron Esfahani <dirty@apple.com>,\n Magnus Kulke <magnuskulke@linux.microsoft.com>, qemu-arm@nongnu.org,\n Peter Maydell <peter.maydell@linaro.org>,\n Roman Bolshakov <rbolshakov@ddn.com>, Paolo Bonzini <pbonzini@redhat.com>,\n Mohamed Mediouni <mohamed@unpredictable.fr>,\n Pedro Barbuda <pbarbuda@microsoft.com>,\n =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= <berrange@redhat.com>, =?utf-8?q?Marc?=\n\t=?utf-8?q?-Andr=C3=A9_Lureau?= <marcandre.lureau@redhat.com>,\n Magnus Kulke <magnus.kulke@linux.microsoft.com>, =?utf-8?q?Philippe_Mathieu?=\n\t=?utf-8?q?-Daud=C3=A9?= <philmd@linaro.org>, Wei Liu <wei.liu@kernel.org>,\n Zhao Liu <zhao1.liu@intel.com>", "Subject": "[PATCH v3 14/14] whpx: i386: saving/restoring less state for\n WHPX_LEVEL_FAST_RUNTIME_STATE", "Date": "Sun, 15 Feb 2026 06:22:25 +0100", "Message-ID": "<20260215052225.22513-15-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260215052225.22513-1-mohamed@unpredictable.fr>", "References": "<20260215052225.22513-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Proofpoint-GUID": "hHsj441UFPPPPUy3O2prKuJBgtS4GHxk", "X-Proofpoint-ORIG-GUID": "hHsj441UFPPPPUy3O2prKuJBgtS4GHxk", "X-Authority-Info-Out": "v=2.4 cv=bIEb4f+Z c=1 sm=1 tr=0 ts=6991584a\n cx=c_apl:c_apl_out:c_pps a=9OgfyREA4BUYbbCgc0Y0oA==:117\n a=9OgfyREA4BUYbbCgc0Y0oA==:17 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22\n a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=4wYEPAPKIlw1fLqtQJoA:9", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMjE1MDAzNiBTYWx0ZWRfX6HNdg0DEwtCs\n 4XcFJ93kCeyBKKNVVszGA3fWVKitkyTBtnyL/osRae5OwiXMzEi/sFHMVv80f8AohX1+HeYpCKg\n XQC4b8QkdH/kpUzt2i3+sMex7ZFqwnw4qtKh53W/d1CCf/dfN93aue4Cy5D0qnilBxmepA07ngc\n 5k518+6cl0of+b48IrW/GIP8alkzJRFxYrz86y8SNuYcLgSqyfdK5jVwbvv7j4qkflycFkfOihU\n TWwjhEmZ4MoM9/KAS5ADsR05By0B8gCfBUHvWBwJBNb3kDC4Gc5m5dXHj3Kamp+A3KPW4aWTKpg\n 1rQOaAg+gDBununtrHS4cwGAO7jun58jKOkn4N9t+Rnp/g0bBowqpEndtks94Q=", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-02-15_02,2026-02-13_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0 mlxscore=0\n spamscore=0 clxscore=1030 adultscore=0 mlxlogscore=967 lowpriorityscore=0\n malwarescore=0 bulkscore=0 suspectscore=0 phishscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2602150036", "X-JNJ": "\n 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", "Received-SPF": "pass client-ip=57.103.68.53;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.mr.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_MSPIKE_H4=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": "Optimise vmexits by save/restoring less state in those cases instead of the full state.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\n---\n target/i386/whpx/whpx-all.c | 16 ++++++++++++----\n 1 file changed, 12 insertions(+), 4 deletions(-)", "diff": "diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 7bbe63e794..9d1febce52 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -420,6 +420,13 @@ void whpx_set_registers(CPUState *cpu, WHPXStateLevel level)\n vcxt.values[idx].Segment = whpx_seg_q2h(&env->segs[i], v86, r86);\n }\n \n+ /*\n+ * This is a hot path called on every MMIO access.\n+ */\n+ if (level <= WHPX_LEVEL_FAST_RUNTIME_STATE) {\n+ goto skip_to_set_registers;\n+ }\n+\n assert(idx == WHvX64RegisterLdtr);\n vcxt.values[idx++].Segment = whpx_seg_q2h(&env->ldt, 0, 0);\n \n@@ -529,10 +536,11 @@ void whpx_set_registers(CPUState *cpu, WHPXStateLevel level)\n \n assert(idx == RTL_NUMBER_OF(whpx_register_names));\n \n+ skip_to_set_registers:\n hr = whp_dispatch.WHvSetVirtualProcessorRegisters(\n whpx->partition, cpu->cpu_index,\n whpx_register_names,\n- RTL_NUMBER_OF(whpx_register_names),\n+ idx,\n &vcxt.values[0]);\n \n if (FAILED(hr)) {\n@@ -612,7 +620,7 @@ void whpx_get_registers(CPUState *cpu, WHPXStateLevel level)\n hr);\n }\n \n- if (whpx_irqchip_in_kernel()) {\n+ if (level > WHPX_LEVEL_FAST_RUNTIME_STATE && whpx_irqchip_in_kernel()) {\n /*\n * Fetch the TPR value from the emulated APIC. It may get overwritten\n * below with the value from CR8 returned by\n@@ -668,7 +676,7 @@ void whpx_get_registers(CPUState *cpu, WHPXStateLevel level)\n env->cr[4] = vcxt.values[idx++].Reg64;\n assert(whpx_register_names[idx] == WHvX64RegisterCr8);\n tpr = vcxt.values[idx++].Reg64;\n- if (tpr != vcpu->tpr) {\n+ if (level > WHPX_LEVEL_FAST_RUNTIME_STATE && tpr != vcpu->tpr) {\n vcpu->tpr = tpr;\n cpu_set_apic_tpr(x86_cpu->apic_state, whpx_cr8_to_apic_tpr(tpr));\n }\n@@ -754,7 +762,7 @@ void whpx_get_registers(CPUState *cpu, WHPXStateLevel level)\n \n assert(idx == RTL_NUMBER_OF(whpx_register_names));\n \n- if (whpx_irqchip_in_kernel()) {\n+ if (level > WHPX_LEVEL_FAST_RUNTIME_STATE && whpx_irqchip_in_kernel()) {\n whpx_apic_get(x86_cpu->apic_state);\n }\n \n", "prefixes": [ "v3", "14/14" ] }