From nobody Mon Nov 25 05:40:17 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass header.i=@intel.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=intel.com ARC-Seal: i=1; a=rsa-sha256; t=1717459456; cv=none; d=zohomail.com; s=zohoarc; b=RxtRmJDCFnYfguJP0YOEoEAoRh4b7b67M6k5wx6r7CVgK78CZvrxGyyEtw53Khm7w8/lQXA86tdUq6IgWjy8uIkBIujFJMsE1hpHOPox+MPccTSpRq8zDhQGbLndovaB/ZB7yXPvZiaxEcX90zTPMgNfZL6br17iK91fKjr9LB4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1717459456; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=ykqU3TwOJ8C1SIdHQNx3ymEFq7Jtp9UpZcFevMN7viY=; b=gXgfdTxjzS4rZgsLrK78vIMztOZtCS5UgXc8beNaxvCMWRBa3IaIxj3OudsUePEOSZ+nvQzCHJoMmhAu/1pCvutBaj9tS4nN5KzY0kfCoV7Zya4w+o0PBig2q9gqDHfysjGtj+vtWaTLduo/NA75PrWH/8OLoMsNEQKyvAY8NSY= ARC-Authentication-Results: i=1; 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03 Jun 2024 17:03:00 -0700 Received: from 9cc2c43eec6b.jf.intel.com ([10.54.77.100]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Jun 2024 17:03:00 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1717459383; x=1748995383; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=f1jzBUhjmtxORL0/5csTC9hvCz2+IuauIfMm+uVCwmQ=; b=VBXkCWXA+Sp2GnHYFv9llRUoeeCUnmx/jW6O7v04Cmx9azAnygTfDKx3 Iog48GNfQvt5cgnhf97+z90611XBS1sRuYUHm6KGD/eG+CN8tEqGMj/AN 48XPmECXU354llYPgZ9L13NDNDeCYlGdJAaZJtDU0AhvxaFxye7PHx3yU rSMSMw2+VSJbmcQjs94m+ozmAHedcd3HO9NhoNtsgNU7cSvwhFerzrpET JESw5XoZl9SesHOrA+Y3OMjejkrk14ASf9C5yr4Wbh7NbmFEuHvl95ty7 y8dnvIlGBpc7/xSHws0mdyjLrx6Yz/p1/v34TBSFAsTCOm9E9dI3/KgjB A==; X-CSE-ConnectionGUID: WRrNDh04TU6ONB9stY8Xog== X-CSE-MsgGUID: OqtLMxmZRPyhXVSi/XNRPA== X-IronPort-AV: E=McAfee;i="6600,9927,11092"; a="13924788" X-IronPort-AV: E=Sophos;i="6.08,212,1712646000"; d="scan'208";a="13924788" X-CSE-ConnectionGUID: vSXFwT4rSsq8SaV6IYdZsQ== X-CSE-MsgGUID: C93EsmjETrGdZ39X0xdrdg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,212,1712646000"; d="scan'208";a="74529678" From: Zide Chen To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, mst@redhat.com, thuth@redhat.com, cfontana@suse.de, xiaoyao.li@intel.com, qemu-trivial@nongnu.org, seanjc@google.com, zhao1.liu@intel.com, Zide Chen Subject: [PATCH V3 1/2] vl: Allow multiple -overcommit commands Date: Mon, 3 Jun 2024 17:02:21 -0700 Message-Id: <20240604000222.75065-2-zide.chen@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240604000222.75065-1-zide.chen@intel.com> References: <20240604000222.75065-1-zide.chen@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=198.175.65.21; envelope-from=zide.chen@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1717459456869100001 Content-Type: text/plain; charset="utf-8" Both cpu-pm and mem-lock are related to system resource overcommit, but they are separate from each other, in terms of how they are realized, and of course, they are applied to different system resources. It's tempting to use separate command lines to specify their behavior. e.g., in the following example, the cpu-pm command is quietly overwritten, and it's not easy to notice it without careful inspection. --overcommit mem-lock=3Don --overcommit cpu-pm=3Don Fixes: c8c9dc42b7ca ("Remove the deprecated -realtime option") Suggested-by: Thomas Huth Signed-off-by: Zide Chen Reviewed-by: Thomas Huth Reviewed-by: Zhao Liu Reviewed-by: Igor Mammedov --- V3: added Reviewed-by v2: Thanks to Thomas' suggestion, changed to this better approach, which is more generic and can handle situations like: "enabled the option in the config file, and now you'd like to disable it on the command line again". system/vl.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/system/vl.c b/system/vl.c index a3eede5fa5b8..dfa6cdd9283b 100644 --- a/system/vl.c +++ b/system/vl.c @@ -3545,8 +3545,8 @@ void qemu_init(int argc, char **argv) if (!opts) { exit(1); } - enable_mlock =3D qemu_opt_get_bool(opts, "mem-lock", false= ); - enable_cpu_pm =3D qemu_opt_get_bool(opts, "cpu-pm", false); + enable_mlock =3D qemu_opt_get_bool(opts, "mem-lock", enabl= e_mlock); + enable_cpu_pm =3D qemu_opt_get_bool(opts, "cpu-pm", enable= _cpu_pm); break; case QEMU_OPTION_compat: { --=20 2.34.1 From nobody Mon Nov 25 05:40:17 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass header.i=@intel.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=intel.com ARC-Seal: i=1; a=rsa-sha256; t=1717459460; cv=none; d=zohomail.com; s=zohoarc; b=naq76EwuvyuDYV/j6NDLkCyvNhFf0I4FSrXKykAy6iw42aftyU5mnKYDnqjkvec3Zyn8nrC1K2ktw8ZBxnjqEweR8ps9Wdg81vsBfmG/VchDy/WZ5Z4tbV7lnOgVqdsgcj1DkkNuOZTM60/Z/1ujG7Grvhbb6BbPgnZEWf+c/b0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1717459460; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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X-CSE-ConnectionGUID: bFKmixXsR5aEajhgd/BC5w== X-CSE-MsgGUID: 7He7SkpuQGKYHxHFtgGKBw== X-IronPort-AV: E=McAfee;i="6600,9927,11092"; a="13924793" X-IronPort-AV: E=Sophos;i="6.08,212,1712646000"; d="scan'208";a="13924793" X-CSE-ConnectionGUID: XKeE7sPtRdee3vPKeCYNOg== X-CSE-MsgGUID: zTGuPn8VR8WoUZ4ePjdfEw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,212,1712646000"; d="scan'208";a="74529690" From: Zide Chen To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, mst@redhat.com, thuth@redhat.com, cfontana@suse.de, xiaoyao.li@intel.com, qemu-trivial@nongnu.org, seanjc@google.com, zhao1.liu@intel.com, Zide Chen Subject: [PATCH V3 2/2] target/i386: Advertise MWAIT iff host supports Date: Mon, 3 Jun 2024 17:02:22 -0700 Message-Id: <20240604000222.75065-3-zide.chen@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240604000222.75065-1-zide.chen@intel.com> References: <20240604000222.75065-1-zide.chen@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=198.175.65.21; envelope-from=zide.chen@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1717459462827100003 Content-Type: text/plain; charset="utf-8" host_cpu_realizefn() sets CPUID_EXT_MONITOR without consulting host/KVM capabilities. This may cause problems: - If MWAIT/MONITOR is not available on the host, advertising this feature to the guest and executing MWAIT/MONITOR from the guest triggers #UD and the guest doesn't boot. This is because typically #UD takes priority over VM-Exit interception checks and KVM doesn't emulate MONITOR/MWAIT on #UD. - If KVM doesn't support KVM_X86_DISABLE_EXITS_MWAIT, MWAIT/MONITOR from the guest are intercepted by KVM, which is not what cpu-pm=3Don intends to do. In these cases, MWAIT/MONITOR should not be exposed to the guest. The logic in kvm_arch_get_supported_cpuid() to handle CPUID_EXT_MONITOR is correct and sufficient, and we can't set CPUID_EXT_MONITOR after x86_cpu_filter_features(). This was not an issue before commit 662175b91ff ("i386: reorder call to cpu_exec_realizefn") because the feature added in the accel-specific realizefn could be checked against host availability and filtered out. Additionally, it seems not a good idea to handle guest CPUID leaves in host_cpu_realizefn(), and this patch merges host_cpu_enable_cpu_pm() into kvm_cpu_realizefn(). Fixes: f5cc5a5c1686 ("i386: split cpu accelerators from cpu.c, using AccelC= PUClass") Fixes: 662175b91ff2 ("i386: reorder call to cpu_exec_realizefn") Signed-off-by: Zide Chen Reviewed-by: Igor Mammedov Reviewed-by: Xiaoyao Li Reviewed-by: Zhao Liu --- V3: - don't set CPUID_EXT_MONITOR in kvm_cpu_realizefn(). - Change title to reflect the main purpose of this patch. target/i386/host-cpu.c | 12 ------------ target/i386/kvm/kvm-cpu.c | 11 +++++++++-- 2 files changed, 9 insertions(+), 14 deletions(-) diff --git a/target/i386/host-cpu.c b/target/i386/host-cpu.c index 280e427c017c..8b8bf5afeccf 100644 --- a/target/i386/host-cpu.c +++ b/target/i386/host-cpu.c @@ -42,15 +42,6 @@ static uint32_t host_cpu_phys_bits(void) return host_phys_bits; } =20 -static void host_cpu_enable_cpu_pm(X86CPU *cpu) -{ - CPUX86State *env =3D &cpu->env; - - host_cpuid(5, 0, &cpu->mwait.eax, &cpu->mwait.ebx, - &cpu->mwait.ecx, &cpu->mwait.edx); - env->features[FEAT_1_ECX] |=3D CPUID_EXT_MONITOR; -} - static uint32_t host_cpu_adjust_phys_bits(X86CPU *cpu) { uint32_t host_phys_bits =3D host_cpu_phys_bits(); @@ -83,9 +74,6 @@ bool host_cpu_realizefn(CPUState *cs, Error **errp) X86CPU *cpu =3D X86_CPU(cs); CPUX86State *env =3D &cpu->env; =20 - if (cpu->max_features && enable_cpu_pm) { - host_cpu_enable_cpu_pm(cpu); - } if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) { uint32_t phys_bits =3D host_cpu_adjust_phys_bits(cpu); =20 diff --git a/target/i386/kvm/kvm-cpu.c b/target/i386/kvm/kvm-cpu.c index f76972e47e61..148d10ce3711 100644 --- a/target/i386/kvm/kvm-cpu.c +++ b/target/i386/kvm/kvm-cpu.c @@ -65,8 +65,15 @@ static bool kvm_cpu_realizefn(CPUState *cs, Error **errp) * cpu_common_realizefn() (via xcc->parent_realize) */ if (cpu->max_features) { - if (enable_cpu_pm && kvm_has_waitpkg()) { - env->features[FEAT_7_0_ECX] |=3D CPUID_7_0_ECX_WAITPKG; + if (enable_cpu_pm) { + if (kvm_has_waitpkg()) { + env->features[FEAT_7_0_ECX] |=3D CPUID_7_0_ECX_WAITPKG; + } + + if (env->features[FEAT_1_ECX] & CPUID_EXT_MONITOR) { + host_cpuid(5, 0, &cpu->mwait.eax, &cpu->mwait.ebx, + &cpu->mwait.ecx, &cpu->mwait.edx); + } } if (cpu->ucode_rev =3D=3D 0) { cpu->ucode_rev =3D --=20 2.34.1