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GET /api/1.0/patches/2219424/?format=api
{ "id": 2219424, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2219424/?format=api", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.0/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": "" }, "msgid": "<20260402234724.88276-4-mohamed@unpredictable.fr>", "date": "2026-04-02T23:47:20", "name": "[v3,3/7] whpx: i386: wire up feature probing", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "fb2c77030df58b8b4ee47115730e24ee76fc8c1e", "submitter": { "id": 91318, "url": "http://patchwork.ozlabs.org/api/1.0/people/91318/?format=api", "name": "Mohamed Mediouni", "email": "mohamed@unpredictable.fr" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260402234724.88276-4-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 498566, "url": "http://patchwork.ozlabs.org/api/1.0/series/498566/?format=api", "date": "2026-04-02T23:47:19", "name": "whpx: i386: x2apic emulation for kernel-irqchip=off, feature probing", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/498566/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219424/checks/", "tags": {}, "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=djQikc33;\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 4fmz8S6YNRz1yFT\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 03 Apr 2026 10:48:55 +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 1w8RlF-0004HD-V1; Thu, 02 Apr 2026 19:47:41 -0400", "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 1w8RlD-0004G4-Iz\n for qemu-devel@nongnu.org; Thu, 02 Apr 2026 19:47:39 -0400", "from p-west2-cluster6-host11-snip4-10.eps.apple.com ([57.103.70.113]\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 1w8RlB-00043B-M6\n for qemu-devel@nongnu.org; Thu, 02 Apr 2026 19:47:39 -0400", "from outbound.mr.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-west-2a-60-percent-6 (Postfix) with ESMTPS id\n E1EE4180011E; Thu, 02 Apr 2026 23:47:34 +0000 (UTC)", "from localhost.localdomain (unknown [17.57.152.38])\n by p00-icloudmta-asmtp-us-west-2a-60-percent-6 (Postfix) with ESMTPSA id\n 01F33180015B; Thu, 02 Apr 2026 23:47:32 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1775173656; x=1777765656;\n bh=YwZcVXBfJVLo1em3oKIVnDZebicfg5+sjVYMpC3NgCY=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=djQikc33vMUjPf4iNWxUryklUWCDGRvDnD0t5zD08ytVfDZpzTW93YFJ2lq9PmT86jkL3ebQSTgvJgBIuHSBRl6FG4mbARMoxJBpgrdUH5Na7lUb/j5DYBHFLBPtYklFdvbgV6FF2qitiQTnNrsY8Bsyta5xs4mqnn/8AeCCryBLj3CpGsWQLIxPgxHiUq0AQJ0HdvcMucIGiOMWWDA7L+EKylk3vaHHBtUi4mnSNXSGo9lPp/PYCfWi4o7lohBMJ7VxRs1gjkOpzg/WoXU6+GA+49zOpUwrjqVr0juADyApqMYEd8o1Fb5MUMlQgyRlz+updycvb2+SR/7wuI7TEA==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Mohamed Mediouni <mohamed@unpredictable.fr>,\n Phil Dennis-Jordan <phil@philjordan.eu>,\n Roman Bolshakov <rbolshakov@ddn.com>, Zhao Liu <zhao1.liu@intel.com>,\n Paolo Bonzini <pbonzini@redhat.com>,\n Pedro Barbuda <pbarbuda@microsoft.com>, Wei Liu <wei.liu@kernel.org>", "Subject": "[PATCH v3 3/7] whpx: i386: wire up feature probing", "Date": "Fri, 3 Apr 2026 01:47:20 +0200", "Message-ID": "<20260402234724.88276-4-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260402234724.88276-1-mohamed@unpredictable.fr>", "References": "<20260402234724.88276-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDAyMDIxMiBTYWx0ZWRfX4jFM0ZPXll2G\n M/TrzzdcIE52FwB21rl3tMaKIQIB69slOZyJY7YRwtQhD5Xk9VerB3C+8Dqj1aX5bJPxBZQQGeI\n doJcwqkqWF7NPzdeN0rtvj1zCX2+jKwb2pD+znEWeuHmbnBDUz+iAid1OVbwB3nIKRXqrllmk7O\n Q8tcVNntiElVzcl5wCob1WTtzUNllRTsliiiE2gkB8lVs2Ymzk7+16J75zJ10JZddY1zp4jhPGS\n AO0G50YBrnLwkRHQD/rpRkvpxpJALqhey4NZmYy45FX9T0Ip4/VZ1R1TXz/oYFXTahWS0mV95Mn\n PkzIcAai2wkWWNIub2zG9UvEDX1eMpGkC5mK0z7412g5mmc8LSKivFwKgB12o4=", "X-Proofpoint-GUID": "kbZsAH93IBsPMd7IBPC-JR_C2QYp1vtn", "X-Proofpoint-ORIG-GUID": "kbZsAH93IBsPMd7IBPC-JR_C2QYp1vtn", "X-Authority-Info-Out": "v=2.4 cv=I4lohdgg c=1 sm=1 tr=0 ts=69cf0017\n cx=c_apl:c_pps:t_out a=9OgfyREA4BUYbbCgc0Y0oA==:117\n a=9OgfyREA4BUYbbCgc0Y0oA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=chH-Irj3ACVSo6TJNi4A:9", "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=2026-04-02_04,2026-04-02_05,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0 phishscore=0\n adultscore=0 mlxscore=0 lowpriorityscore=0 spamscore=0 clxscore=1030\n suspectscore=0 mlxlogscore=994 bulkscore=0 malwarescore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604020212", "Received-SPF": "pass client-ip=57.103.70.113;\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_H2=0.001,\n RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001,\n RCVD_IN_VALIDITY_RPBL_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": "Windows 10 doesn't have the API for this, so using this\nonly for Windows 11.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\n---\n include/system/whpx-internal.h | 3 ++\n target/i386/cpu.c | 25 ++++++++++++\n target/i386/whpx/whpx-all.c | 69 +++++++++++++++++++++++++++++++++-\n target/i386/whpx/whpx-i386.h | 4 ++\n 4 files changed, 100 insertions(+), 1 deletion(-)\n create mode 100644 target/i386/whpx/whpx-i386.h", "diff": "diff --git a/include/system/whpx-internal.h b/include/system/whpx-internal.h\nindex 8482901f71..18fa792ac7 100644\n--- a/include/system/whpx-internal.h\n+++ b/include/system/whpx-internal.h\n@@ -89,6 +89,9 @@ void whpx_apic_get(APICCommonState *s);\n UINT32 StateSize)) \\\n X(HRESULT, WHvResetPartition, \\\n (WHV_PARTITION_HANDLE Partition)) \\\n+ X(HRESULT, WHvGetVirtualProcessorCpuidOutput, \\\n+ (WHV_PARTITION_HANDLE Partition, UINT32 VpIndex, UINT32 Eax, \\\n+ UINT32 Ecx, WHV_CPUID_OUTPUT *CpuidOutput))\n \n #define WHP_DEFINE_TYPE(return_type, function_name, signature) \\\n typedef return_type (WINAPI *function_name ## _t) signature;\ndiff --git a/target/i386/cpu.c b/target/i386/cpu.c\nindex c6fd1dc00e..0000093fa3 100644\n--- a/target/i386/cpu.c\n+++ b/target/i386/cpu.c\n@@ -26,6 +26,8 @@\n #include \"tcg/helper-tcg.h\"\n #include \"exec/translation-block.h\"\n #include \"system/hvf.h\"\n+#include \"system/whpx.h\"\n+#include \"whpx/whpx-i386.h\"\n #include \"hvf/hvf-i386.h\"\n #include \"kvm/kvm_i386.h\"\n #include \"kvm/tdx.h\"\n@@ -8087,6 +8089,17 @@ uint64_t x86_cpu_get_supported_feature_word(X86CPU *cpu, FeatureWord w)\n r = hvf_get_supported_cpuid(wi->cpuid.eax,\n wi->cpuid.ecx,\n wi->cpuid.reg);\n+ } else if (whpx_enabled()) {\n+ if (wi->type != CPUID_FEATURE_WORD) {\n+ return 0;\n+ }\n+ if (whpx_is_legacy_os()) {\n+ r = wi->tcg_features;\n+ } else {\n+ r = whpx_get_supported_cpuid(wi->cpuid.eax,\n+ wi->cpuid.ecx,\n+ wi->cpuid.reg);\n+ }\n } else if (tcg_enabled() || qtest_enabled()) {\n r = wi->tcg_features;\n } else {\n@@ -8168,6 +8181,18 @@ static void x86_cpu_get_supported_cpuid(uint32_t func, uint32_t index,\n *ebx = hvf_get_supported_cpuid(func, index, R_EBX);\n *ecx = hvf_get_supported_cpuid(func, index, R_ECX);\n *edx = hvf_get_supported_cpuid(func, index, R_EDX);\n+ } else if (whpx_enabled()) {\n+ if (whpx_is_legacy_os()) {\n+ *eax = 0;\n+ *ebx = 0;\n+ *ecx = 0;\n+ *edx = 0;\n+ } else {\n+ *eax = whpx_get_supported_cpuid(func, index, R_EAX);\n+ *ebx = whpx_get_supported_cpuid(func, index, R_EBX);\n+ *ecx = whpx_get_supported_cpuid(func, index, R_ECX);\n+ *edx = whpx_get_supported_cpuid(func, index, R_EDX);\n+ }\n } else {\n *eax = 0;\n *ebx = 0;\ndiff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 4127440c0c..ee44e4e060 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -36,6 +36,7 @@\n #include \"system/whpx-accel-ops.h\"\n #include \"system/whpx-all.h\"\n #include \"system/whpx-common.h\"\n+#include \"whpx-i386.h\"\n \n #include \"emulate/x86_decode.h\"\n #include \"emulate/x86_emu.h\"\n@@ -49,6 +50,8 @@\n /* for kernel-irqchip=off */\n #define HV_X64_MSR_APIC_FREQUENCY 0x40000023\n \n+static bool is_legacy_os = false;\n+\n static const WHV_REGISTER_NAME whpx_register_names[] = {\n \n /* X64 General purpose registers */\n@@ -1062,6 +1065,71 @@ static void whpx_init_emu(void)\n init_emu(&whpx_x86_emul_ops);\n }\n \n+bool whpx_is_legacy_os(void)\n+{\n+ return is_legacy_os;\n+}\n+\n+uint32_t whpx_get_supported_cpuid(uint32_t func, uint32_t idx, int reg)\n+{\n+ WHV_CPUID_OUTPUT output;\n+ uint32_t eax, ebx, ecx, edx;\n+ uint32_t cpu_index = 0;\n+ bool temp_cpu = true;\n+ HRESULT hr;\n+\n+ hr = whp_dispatch.WHvCreateVirtualProcessor(\n+ whpx_global.partition, cpu_index, 0);\n+\n+ /* This means that the CPU already exists... */\n+ if (FAILED(hr)) {\n+ temp_cpu = false;\n+ }\n+\n+ hr = whp_dispatch.WHvGetVirtualProcessorCpuidOutput(whpx_global.partition,\n+ cpu_index, func, idx, &output);\n+\n+ if (FAILED(hr)) {\n+ abort();\n+ }\n+\n+ if (temp_cpu) {\n+ hr = whp_dispatch.WHvDeleteVirtualProcessor(whpx_global.partition, cpu_index);\n+ if (FAILED(hr)) {\n+ abort();\n+ }\n+ }\n+\n+ eax = output.Eax;\n+ ebx = output.Ebx;\n+ ecx = output.Ecx;\n+ edx = output.Edx;\n+\n+ /*\n+ * We can emulate X2APIC even for the kernel-irqchip=off case.\n+ * CPUID_EXT_HYPERVISOR and CPUID_HT should be considered present\n+ * always, so report them as unconditionally supported here.\n+ */\n+ if (func == 1) {\n+ ecx |= CPUID_EXT_X2APIC;\n+ ecx |= CPUID_EXT_HYPERVISOR;\n+ edx |= CPUID_HT;\n+ }\n+\n+ switch (reg) {\n+ case R_EAX:\n+ return eax;\n+ case R_EBX:\n+ return ebx;\n+ case R_ECX:\n+ return ecx;\n+ case R_EDX:\n+ return edx;\n+ default:\n+ return 0;\n+ }\n+}\n+\n /*\n * Controls whether we should intercept various exceptions on the guest,\n * namely breakpoint/single-step events.\n@@ -2235,7 +2303,6 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n WHV_CAPABILITY_FEATURES features = {0};\n WHV_PROCESSOR_FEATURES_BANKS processor_features;\n WHV_PROCESSOR_PERFMON_FEATURES perfmon_features;\n- bool is_legacy_os = false;\n UINT32 cpuidExitList[] = {1};\n \n whpx = &whpx_global;\ndiff --git a/target/i386/whpx/whpx-i386.h b/target/i386/whpx/whpx-i386.h\nnew file mode 100644\nindex 0000000000..6db9a75d39\n--- /dev/null\n+++ b/target/i386/whpx/whpx-i386.h\n@@ -0,0 +1,4 @@\n+/* SPDX-License-Identifier: GPL-2.0-or-later */\n+\n+uint32_t whpx_get_supported_cpuid(uint32_t func, uint32_t idx, int reg);\n+bool whpx_is_legacy_os(void);\n", "prefixes": [ "v3", "3/7" ] }