From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sean Christopherson Date: Wed, 16 Nov 2022 01:56:12 +0000 Subject: [PATCH 33/44] KVM: x86: Do VMX/SVM support checks directly in vendor code In-Reply-To: <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-34-seanjc@google.com> <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> Message-ID: List-Id: To: kvm-riscv@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Tue, Nov 15, 2022, Huang, Kai wrote: > On Wed, 2022-11-02 at 23:19 +0000, Sean Christopherson wrote: > > +static bool __init kvm_is_vmx_supported(void) > > +{ > > + if (!cpu_has_vmx()) { > > + pr_err("CPU doesn't support VMX\n"); > > + return false; > > + } > > + > > + if (!boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > + ??? !boot_cpu_has(X86_FEATURE_VMX)) { > > + pr_err("VMX not enabled in MSR_IA32_FEAT_CTL\n"); > > + return false; > > + } > > + > > + return true; > > +} > > + > > ?static int __init vmx_check_processor_compat(void) > > ?{ > > ? struct vmcs_config vmcs_conf; > > ? struct vmx_capability vmx_cap; > > ? > > - if (!this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > - ??? !this_cpu_has(X86_FEATURE_VMX)) { > > - pr_err("VMX is disabled on CPU %d\n", smp_processor_id()); > > + if (!kvm_is_vmx_supported()) > > ? return -EIO; > > - } > > ? > > Looks there's a functional change here -- the old code checks local cpu's > feature bits but the new code always checks bsp's feature bits. Should have no > problem I think, though. Ouch. The bad check will defeat the purpose of doing compat checks. Nice catch! From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36305C43219 for ; Wed, 16 Nov 2022 01:56:23 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id AD8E54B8DE; Tue, 15 Nov 2022 20:56:22 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i8201JaUED91; Tue, 15 Nov 2022 20:56:20 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id CB4F34B8BA; Tue, 15 Nov 2022 20:56:20 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 3278A4B86B for ; Tue, 15 Nov 2022 20:56:20 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id scqiNk2TnEVN for ; Tue, 15 Nov 2022 20:56:18 -0500 (EST) Received: from mail-pl1-f169.google.com (mail-pl1-f169.google.com [209.85.214.169]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 0DBC64B84E for ; Tue, 15 Nov 2022 20:56:17 -0500 (EST) Received: by mail-pl1-f169.google.com with SMTP id io19so15083906plb.8 for ; Tue, 15 Nov 2022 17:56:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=KVMI/nFFiiWGPsODZP4uTO9+eDXKExXBhUQy4MPYB78=; b=ZkhmtpyvuQjtpiKcSTwV4FQaNI1BndPmVfYwRbI4kyGyIBWLGYAK9adsViZh/yHJ7x GuxgtogV7PtxaPytplYxo+Klt0B/2ry2vtbUojn3VI5CZqcW98TXvlxs8G1FSU2NCLPG osV9xc1d2y7cg0+wNaz5Nf0N26qzO6pIP5sDWfotE89nSnvse7sYp7t8PQ00S927CjrN Mt9iItQr7ceVWaHS8qhCiI1BYymChnkKt5hyJqGOY0FEweE8dtCPm+eSBErPLu7yhTm8 o9dFADTr9ZdWsubEfckpwD5DI+8OZmAD6JfaYPF77XPfSWF6ATOhEkaqdt7s4F4xOEiQ xj8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=KVMI/nFFiiWGPsODZP4uTO9+eDXKExXBhUQy4MPYB78=; b=o5QS7/zT28xkIfLvCTglW3SUfNwXXWdbwT65AF+bu+/8ySapWqPucBTpT6VpBDKLZa i+oVsTCNA+Kj96otgjuF+ib+OwR0iItOLK4NTep0vTABtStmfI0AmSpiLvIUDbRsTT39 VGamnr+wl0lXcEMUxKQ+Bs8NL6b92tMn8Z02YzAbyp/7aEbc/OI0wOsQO2ntOWTU33dy Gm1a21zfrTf3OI1KkQEgsIFcsvISAYT7996FUF1KuZPnjdRElOHc3yCoPdkcogZn6ZDG +8I1lwvtiv7AZERzy9pQsTuF56epshrUPg8Gmf9ZkUeBwWCpFV79nvqtWfPDBUe1ijcQ Mhng== X-Gm-Message-State: ANoB5pmbt/+g0VcHRfzcpQGSgBjtL1P7lDgpTEOcfxAXk8fc4lsbhmXf wBayWBMREJfft7MHxSPCGzS0Ig== X-Google-Smtp-Source: AA0mqf6H0QJ9u7lmf5OzgdM3vacJIFtJ+zbl369j6MJCYNSFKT6kmzTaZY88ji+zMgthkUAHrSJWdg== X-Received: by 2002:a17:90a:5883:b0:218:f84:3f98 with SMTP id j3-20020a17090a588300b002180f843f98mr1206419pji.238.1668563776878; Tue, 15 Nov 2022 17:56:16 -0800 (PST) Received: from google.com (7.104.168.34.bc.googleusercontent.com. [34.168.104.7]) by smtp.gmail.com with ESMTPSA id z25-20020aa79499000000b0056ca3569a66sm9483483pfk.129.2022.11.15.17.56.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Nov 2022 17:56:16 -0800 (PST) Date: Wed, 16 Nov 2022 01:56:12 +0000 From: Sean Christopherson To: "Huang, Kai" Subject: Re: [PATCH 33/44] KVM: x86: Do VMX/SVM support checks directly in vendor code Message-ID: References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-34-seanjc@google.com> <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> Cc: "mjrosato@linux.ibm.com" , "david@redhat.com" , "Yao, Yuan" , "linux-mips@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "imbrenda@linux.ibm.com" , "kvmarm@lists.cs.columbia.edu" , "linux-s390@vger.kernel.org" , "frankja@linux.ibm.com" , "mpe@ellerman.id.au" , "chenhuacai@kernel.org" , "aleksandar.qemu.devel@gmail.com" , "borntraeger@linux.ibm.com" , "Gao, Chao" , "farman@linux.ibm.com" , "aou@eecs.berkeley.edu" , "kvm@vger.kernel.org" , "paul.walmsley@sifive.com" , "kvmarm@lists.linux.dev" , "tglx@linutronix.de" , "linux-arm-kernel@lists.infradead.org" , "Yamahata, Isaku" , "atishp@atishpatra.org" , "farosas@linux.ibm.com" , "linux-kernel@vger.kernel.org" , "palmer@dabbelt.com" , "kvm-riscv@lists.infradead.org" , "maz@kernel.org" , "pbonzini@redhat.com" , "vkuznets@redhat.com" , "linuxppc-dev@lists.ozlabs.org" X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Tue, Nov 15, 2022, Huang, Kai wrote: > On Wed, 2022-11-02 at 23:19 +0000, Sean Christopherson wrote: > > +static bool __init kvm_is_vmx_supported(void) > > +{ > > + if (!cpu_has_vmx()) { > > + pr_err("CPU doesn't support VMX\n"); > > + return false; > > + } > > + > > + if (!boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > + =A0=A0=A0 !boot_cpu_has(X86_FEATURE_VMX)) { > > + pr_err("VMX not enabled in MSR_IA32_FEAT_CTL\n"); > > + return false; > > + } > > + > > + return true; > > +} > > + > > =A0static int __init vmx_check_processor_compat(void) > > =A0{ > > =A0 struct vmcs_config vmcs_conf; > > =A0 struct vmx_capability vmx_cap; > > =A0 > > - if (!this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > - =A0=A0=A0 !this_cpu_has(X86_FEATURE_VMX)) { > > - pr_err("VMX is disabled on CPU %d\n", smp_processor_id()); > > + if (!kvm_is_vmx_supported()) > > =A0 return -EIO; > > - } > > =A0 > = > Looks there's a functional change here -- the old code checks local cpu's > feature bits but the new code always checks bsp's feature bits. Should h= ave no > problem I think, though. Ouch. The bad check will defeat the purpose of doing compat checks. Nice = catch! _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 91C737C for ; Wed, 16 Nov 2022 01:56:17 +0000 (UTC) Received: by mail-pl1-f174.google.com with SMTP id 4so15139391pli.0 for ; Tue, 15 Nov 2022 17:56:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=KVMI/nFFiiWGPsODZP4uTO9+eDXKExXBhUQy4MPYB78=; b=ZkhmtpyvuQjtpiKcSTwV4FQaNI1BndPmVfYwRbI4kyGyIBWLGYAK9adsViZh/yHJ7x GuxgtogV7PtxaPytplYxo+Klt0B/2ry2vtbUojn3VI5CZqcW98TXvlxs8G1FSU2NCLPG osV9xc1d2y7cg0+wNaz5Nf0N26qzO6pIP5sDWfotE89nSnvse7sYp7t8PQ00S927CjrN Mt9iItQr7ceVWaHS8qhCiI1BYymChnkKt5hyJqGOY0FEweE8dtCPm+eSBErPLu7yhTm8 o9dFADTr9ZdWsubEfckpwD5DI+8OZmAD6JfaYPF77XPfSWF6ATOhEkaqdt7s4F4xOEiQ xj8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=KVMI/nFFiiWGPsODZP4uTO9+eDXKExXBhUQy4MPYB78=; b=gUCdrnHateWe+L+lEZqHAVRlZU+OJyHwQEhbIPp8v3XY7XwB8sAASopVX0/zqcZRe4 ryB3dlo2+RspDtLjdqtccoa3ME2l4vp7603BROnKNqiYpqaSGbgj9ap1ZFy7ySCVgTke iB6/Lm4o93Zom+5ESQ4zPKHVYUDIOZ5m0nzJn/6XiBg1VxqZmGLW1iyFjno4k/6BBPtI 8m6fGOjMZBtfk0egVIctxMoNsPosfq/56a/QuZC1RnHK6k4wQ7F6LAhI71pcGkysWe6L GLbRydwK8faXFz9jEuA8d2u5kZ6a4KC6Y1mBVjr7tUaayYQEiBTR9idZxWFG1T+9+60q QOeQ== X-Gm-Message-State: ANoB5plceOVOZkHpLd5okAQCrxMVQ4wCrshxO6KdqNa7Ac+YMivEEqHz k3ncRgdsUIiEotifcYPfKlzf2A== X-Google-Smtp-Source: AA0mqf6H0QJ9u7lmf5OzgdM3vacJIFtJ+zbl369j6MJCYNSFKT6kmzTaZY88ji+zMgthkUAHrSJWdg== X-Received: by 2002:a17:90a:5883:b0:218:f84:3f98 with SMTP id j3-20020a17090a588300b002180f843f98mr1206419pji.238.1668563776878; Tue, 15 Nov 2022 17:56:16 -0800 (PST) Received: from google.com (7.104.168.34.bc.googleusercontent.com. [34.168.104.7]) by smtp.gmail.com with ESMTPSA id z25-20020aa79499000000b0056ca3569a66sm9483483pfk.129.2022.11.15.17.56.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Nov 2022 17:56:16 -0800 (PST) Date: Wed, 16 Nov 2022 01:56:12 +0000 From: Sean Christopherson To: "Huang, Kai" Cc: "imbrenda@linux.ibm.com" , "aou@eecs.berkeley.edu" , "mjrosato@linux.ibm.com" , "vkuznets@redhat.com" , "farman@linux.ibm.com" , "chenhuacai@kernel.org" , "paul.walmsley@sifive.com" , "palmer@dabbelt.com" , "maz@kernel.org" , "anup@brainfault.org" , "pbonzini@redhat.com" , "borntraeger@linux.ibm.com" , "aleksandar.qemu.devel@gmail.com" , "frankja@linux.ibm.com" , "oliver.upton@linux.dev" , "kvm@vger.kernel.org" , "Yao, Yuan" , "farosas@linux.ibm.com" , "david@redhat.com" , "james.morse@arm.com" , "mpe@ellerman.id.au" , "alexandru.elisei@arm.com" , "linux-s390@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "Yamahata, Isaku" , "kvmarm@lists.linux.dev" , "suzuki.poulose@arm.com" , "kvm-riscv@lists.infradead.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mips@vger.kernel.org" , "kvmarm@lists.cs.columbia.edu" , "Gao, Chao" , "atishp@atishpatra.org" , "linux-riscv@lists.infradead.org" Subject: Re: [PATCH 33/44] KVM: x86: Do VMX/SVM support checks directly in vendor code Message-ID: References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-34-seanjc@google.com> <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> Message-ID: <20221116015612.6jcKaflJ8U4f6jF7OfNxTwDTcv_JdqdWV4_FLob6yoA@z> On Tue, Nov 15, 2022, Huang, Kai wrote: > On Wed, 2022-11-02 at 23:19 +0000, Sean Christopherson wrote: > > +static bool __init kvm_is_vmx_supported(void) > > +{ > > + if (!cpu_has_vmx()) { > > + pr_err("CPU doesn't support VMX\n"); > > + return false; > > + } > > + > > + if (!boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > +     !boot_cpu_has(X86_FEATURE_VMX)) { > > + pr_err("VMX not enabled in MSR_IA32_FEAT_CTL\n"); > > + return false; > > + } > > + > > + return true; > > +} > > + > >  static int __init vmx_check_processor_compat(void) > >  { > >   struct vmcs_config vmcs_conf; > >   struct vmx_capability vmx_cap; > >   > > - if (!this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > -     !this_cpu_has(X86_FEATURE_VMX)) { > > - pr_err("VMX is disabled on CPU %d\n", smp_processor_id()); > > + if (!kvm_is_vmx_supported()) > >   return -EIO; > > - } > >   > > Looks there's a functional change here -- the old code checks local cpu's > feature bits but the new code always checks bsp's feature bits. Should have no > problem I think, though. Ouch. The bad check will defeat the purpose of doing compat checks. Nice catch! From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 93B37C4332F for ; Wed, 16 Nov 2022 01:56:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=JEJgA/Oyw1P04/bBS2+F2dL+zhN5GXQORfBC9unE/I0=; b=cD00my4aKbtIAO ytBkn+rIfA2M9BR8XljDamIhaxLVLncDu6rX5SB72doaLJklf0Ja3anUbM4K/Z+6s/4Fsb1jtepUH vQ/iDFfDqwy1rQOZMctwtMPrReXiGeViwnQuKIWAeJ7/F0bXizCKS1bM+tkmTn+diUri9+mlm3Es1 eIrW+lLNMpv2/2sP5DU2B62XtRDzFTSHQaHxmLUsi34EN4OxOeyda05MUUcNisICImOykoYdyGiga gnAWG0b2+xX3Pvra9jIvmtWeu0b+J+fvr5JL+P7rTmz1mtdGMvj6z2xHx/+B/GwZLbaIH4nsgu5Ex iUVFIR1RkwMQzLPbEDdQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ov7fE-00GMSY-OX; Wed, 16 Nov 2022 01:56:32 +0000 Received: from mail-pl1-x62b.google.com ([2607:f8b0:4864:20::62b]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ov7f2-00GMDb-Jv for linux-riscv@lists.infradead.org; Wed, 16 Nov 2022 01:56:21 +0000 Received: by mail-pl1-x62b.google.com with SMTP id b21so15082507plc.9 for ; Tue, 15 Nov 2022 17:56:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=KVMI/nFFiiWGPsODZP4uTO9+eDXKExXBhUQy4MPYB78=; b=ZkhmtpyvuQjtpiKcSTwV4FQaNI1BndPmVfYwRbI4kyGyIBWLGYAK9adsViZh/yHJ7x GuxgtogV7PtxaPytplYxo+Klt0B/2ry2vtbUojn3VI5CZqcW98TXvlxs8G1FSU2NCLPG osV9xc1d2y7cg0+wNaz5Nf0N26qzO6pIP5sDWfotE89nSnvse7sYp7t8PQ00S927CjrN Mt9iItQr7ceVWaHS8qhCiI1BYymChnkKt5hyJqGOY0FEweE8dtCPm+eSBErPLu7yhTm8 o9dFADTr9ZdWsubEfckpwD5DI+8OZmAD6JfaYPF77XPfSWF6ATOhEkaqdt7s4F4xOEiQ xj8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=KVMI/nFFiiWGPsODZP4uTO9+eDXKExXBhUQy4MPYB78=; b=rDTRGom7z6o4CXfPkW2CrILw0gO9xjQnoISy1wnOY3oDBPrd01cIFvecglTu2nXYJf UBSJnwUibO7ZXKI6c7nKUrZj4N+7gQMH7ZB41rBMVz7kxH2pzRLdjR12p1wApnlSsnSI YDkOPmk5a3WUDX6qQPQ5JIhO55purRrp/WquOBIvpZ2hJYf20UNl6M0D/svVE/ER6mAr euwYDGoa7fBysgsMIq47CH+i8jakOFhdlhCi5I5M9L4fondwRyHZjeYVLYZtLAAH/0Oa c9eaCvkwFky1Vn3PuKq+gdFV/UVOi0SuqJvU+OsBCZ8ij7V0wZxJGZFGofdVydnbCKwL RM3g== X-Gm-Message-State: ANoB5pn66hzesfTmnV65hQsWdx0wr3jayJGiu8/fhhyhOXpRkEBgejjd B/pzzMqbWf7ZcSf6AfkP2ThTcg== X-Google-Smtp-Source: AA0mqf6H0QJ9u7lmf5OzgdM3vacJIFtJ+zbl369j6MJCYNSFKT6kmzTaZY88ji+zMgthkUAHrSJWdg== X-Received: by 2002:a17:90a:5883:b0:218:f84:3f98 with SMTP id j3-20020a17090a588300b002180f843f98mr1206419pji.238.1668563776878; Tue, 15 Nov 2022 17:56:16 -0800 (PST) Received: from google.com (7.104.168.34.bc.googleusercontent.com. [34.168.104.7]) by smtp.gmail.com with ESMTPSA id z25-20020aa79499000000b0056ca3569a66sm9483483pfk.129.2022.11.15.17.56.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Nov 2022 17:56:16 -0800 (PST) Date: Wed, 16 Nov 2022 01:56:12 +0000 From: Sean Christopherson To: "Huang, Kai" Cc: "imbrenda@linux.ibm.com" , "aou@eecs.berkeley.edu" , "mjrosato@linux.ibm.com" , "vkuznets@redhat.com" , "farman@linux.ibm.com" , "chenhuacai@kernel.org" , "paul.walmsley@sifive.com" , "palmer@dabbelt.com" , "maz@kernel.org" , "anup@brainfault.org" , "pbonzini@redhat.com" , "borntraeger@linux.ibm.com" , "aleksandar.qemu.devel@gmail.com" , "frankja@linux.ibm.com" , "oliver.upton@linux.dev" , "kvm@vger.kernel.org" , "Yao, Yuan" , "farosas@linux.ibm.com" , "david@redhat.com" , "james.morse@arm.com" , "mpe@ellerman.id.au" , "alexandru.elisei@arm.com" , "linux-s390@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "Yamahata, Isaku" , "kvmarm@lists.linux.dev" , "suzuki.poulose@arm.com" , "kvm-riscv@lists.infradead.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mips@vger.kernel.org" , "kvmarm@lists.cs.columbia.edu" , "Gao, Chao" , "atishp@atishpatra.org" , "linux-riscv@lists.infradead.org" Subject: Re: [PATCH 33/44] KVM: x86: Do VMX/SVM support checks directly in vendor code Message-ID: References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-34-seanjc@google.com> <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221115_175620_666134_2211AD03 X-CRM114-Status: GOOD ( 14.58 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Tue, Nov 15, 2022, Huang, Kai wrote: > On Wed, 2022-11-02 at 23:19 +0000, Sean Christopherson wrote: > > +static bool __init kvm_is_vmx_supported(void) > > +{ > > + if (!cpu_has_vmx()) { > > + pr_err("CPU doesn't support VMX\n"); > > + return false; > > + } > > + > > + if (!boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > + =A0=A0=A0 !boot_cpu_has(X86_FEATURE_VMX)) { > > + pr_err("VMX not enabled in MSR_IA32_FEAT_CTL\n"); > > + return false; > > + } > > + > > + return true; > > +} > > + > > =A0static int __init vmx_check_processor_compat(void) > > =A0{ > > =A0 struct vmcs_config vmcs_conf; > > =A0 struct vmx_capability vmx_cap; > > =A0 > > - if (!this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > - =A0=A0=A0 !this_cpu_has(X86_FEATURE_VMX)) { > > - pr_err("VMX is disabled on CPU %d\n", smp_processor_id()); > > + if (!kvm_is_vmx_supported()) > > =A0 return -EIO; > > - } > > =A0 > = > Looks there's a functional change here -- the old code checks local cpu's > feature bits but the new code always checks bsp's feature bits. Should h= ave no > problem I think, though. Ouch. The bad check will defeat the purpose of doing compat checks. Nice = catch! _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 39E93C4332F for ; Wed, 16 Nov 2022 01:57:17 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4NBmQ35Drgz3cMN for ; Wed, 16 Nov 2022 12:57:15 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20210112 header.b=Zkhmtpyv; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=google.com (client-ip=2607:f8b0:4864:20::629; helo=mail-pl1-x629.google.com; envelope-from=seanjc@google.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20210112 header.b=Zkhmtpyv; dkim-atps=neutral Received: from mail-pl1-x629.google.com (mail-pl1-x629.google.com [IPv6:2607:f8b0:4864:20::629]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4NBmP02KJJz2xJN for ; Wed, 16 Nov 2022 12:56:19 +1100 (AEDT) Received: by mail-pl1-x629.google.com with SMTP id 4so15139390pli.0 for ; Tue, 15 Nov 2022 17:56:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=KVMI/nFFiiWGPsODZP4uTO9+eDXKExXBhUQy4MPYB78=; b=ZkhmtpyvuQjtpiKcSTwV4FQaNI1BndPmVfYwRbI4kyGyIBWLGYAK9adsViZh/yHJ7x GuxgtogV7PtxaPytplYxo+Klt0B/2ry2vtbUojn3VI5CZqcW98TXvlxs8G1FSU2NCLPG osV9xc1d2y7cg0+wNaz5Nf0N26qzO6pIP5sDWfotE89nSnvse7sYp7t8PQ00S927CjrN Mt9iItQr7ceVWaHS8qhCiI1BYymChnkKt5hyJqGOY0FEweE8dtCPm+eSBErPLu7yhTm8 o9dFADTr9ZdWsubEfckpwD5DI+8OZmAD6JfaYPF77XPfSWF6ATOhEkaqdt7s4F4xOEiQ xj8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=KVMI/nFFiiWGPsODZP4uTO9+eDXKExXBhUQy4MPYB78=; b=fVwUjVvd7D4NJAHMeYCGc24Tlc6q/MYvYDyqKgqICKJlY8FmGWhctd/Ei2itccGJeS tqdGw8aPbvHiwa0voc7su/g/LTVgDtL7YY41kbd9pRxYi8HRrP7c3fL3LH32Isvmg48X o1QuIEilgrPhnAAfnfX1hVHYMOuFcqtsuxqy6lAJWczQ+zKMBzxsmyNDpE1/5ZMJ3XH3 XJUMv58+/J49mBC9fWERCIcyNgpa6vbRy0+5uv+/eLGzEgFAsuwU1dUNQFSc/Voc7ppK Llo3iSBiNKVeV/Who5akjEwXkKaizYMzFgUfg2kMszT0GCwMJNnQm2QLNlLzjhh+oplO bB5g== X-Gm-Message-State: ANoB5pnRvM7gC80S0nlOEorUqOkArntvKHZvBQGsTVQr7rO2poY4EGfs yKCTKRGcaAj5xgquovTZcm3dHA== X-Google-Smtp-Source: AA0mqf6H0QJ9u7lmf5OzgdM3vacJIFtJ+zbl369j6MJCYNSFKT6kmzTaZY88ji+zMgthkUAHrSJWdg== X-Received: by 2002:a17:90a:5883:b0:218:f84:3f98 with SMTP id j3-20020a17090a588300b002180f843f98mr1206419pji.238.1668563776878; Tue, 15 Nov 2022 17:56:16 -0800 (PST) Received: from google.com (7.104.168.34.bc.googleusercontent.com. [34.168.104.7]) by smtp.gmail.com with ESMTPSA id z25-20020aa79499000000b0056ca3569a66sm9483483pfk.129.2022.11.15.17.56.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Nov 2022 17:56:16 -0800 (PST) Date: Wed, 16 Nov 2022 01:56:12 +0000 From: Sean Christopherson To: "Huang, Kai" Subject: Re: [PATCH 33/44] KVM: x86: Do VMX/SVM support checks directly in vendor code Message-ID: References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-34-seanjc@google.com> <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "mjrosato@linux.ibm.com" , "david@redhat.com" , "Yao, Yuan" , "linux-mips@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "imbrenda@linux.ibm.com" , "kvmarm@lists.cs.columbia.edu" , "linux-s390@vger.kernel.org" , "frankja@linux.ibm.com" , "chenhuacai@kernel.org" , "aleksandar.qemu.devel@gmail.com" , "james.morse@arm.com" , "borntraeger@linux.ibm.com" , "Gao, Chao" , "farman@linux.ibm.com" , "aou@eecs.berkeley.edu" , "suzuki.poulose@arm.com" , "kvm@vger.kernel.org" , "paul.walmsley@sifive.com" , "kvmarm@lists.linux .dev" , "tglx@linutronix.de" , "alexandru.elisei@arm.com" , "linux-arm-kernel@lists.infradead.org" , "Yamahata, Isaku" , "atishp@atishpatra.org" , "farosas@linux.ibm.com" , "anup@brainfault.org" , "linux-kernel@vger.kernel.org" , "oliver.upton@linux.dev" , "palmer@dabbelt.com" , "kvm-riscv@lists.infradead.org" , "maz@kernel.org" , "pbonzini@redhat.com" , "vkuznets@redhat.com" , "linuxppc-dev@lists.ozlabs.org" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Nov 15, 2022, Huang, Kai wrote: > On Wed, 2022-11-02 at 23:19 +0000, Sean Christopherson wrote: > > +static bool __init kvm_is_vmx_supported(void) > > +{ > > + if (!cpu_has_vmx()) { > > + pr_err("CPU doesn't support VMX\n"); > > + return false; > > + } > > + > > + if (!boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > +     !boot_cpu_has(X86_FEATURE_VMX)) { > > + pr_err("VMX not enabled in MSR_IA32_FEAT_CTL\n"); > > + return false; > > + } > > + > > + return true; > > +} > > + > >  static int __init vmx_check_processor_compat(void) > >  { > >   struct vmcs_config vmcs_conf; > >   struct vmx_capability vmx_cap; > >   > > - if (!this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > -     !this_cpu_has(X86_FEATURE_VMX)) { > > - pr_err("VMX is disabled on CPU %d\n", smp_processor_id()); > > + if (!kvm_is_vmx_supported()) > >   return -EIO; > > - } > >   > > Looks there's a functional change here -- the old code checks local cpu's > feature bits but the new code always checks bsp's feature bits. Should have no > problem I think, though. Ouch. The bad check will defeat the purpose of doing compat checks. Nice catch! 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[34.168.104.7]) by smtp.gmail.com with ESMTPSA id z25-20020aa79499000000b0056ca3569a66sm9483483pfk.129.2022.11.15.17.56.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Nov 2022 17:56:16 -0800 (PST) Date: Wed, 16 Nov 2022 01:56:12 +0000 From: Sean Christopherson To: "Huang, Kai" Cc: "imbrenda@linux.ibm.com" , "aou@eecs.berkeley.edu" , "mjrosato@linux.ibm.com" , "vkuznets@redhat.com" , "farman@linux.ibm.com" , "chenhuacai@kernel.org" , "paul.walmsley@sifive.com" , "palmer@dabbelt.com" , "maz@kernel.org" , "anup@brainfault.org" , "pbonzini@redhat.com" , "borntraeger@linux.ibm.com" , "aleksandar.qemu.devel@gmail.com" , "frankja@linux.ibm.com" , "oliver.upton@linux.dev" , "kvm@vger.kernel.org" , "Yao, Yuan" , "farosas@linux.ibm.com" , "david@redhat.com" , "james.morse@arm.com" , "mpe@ellerman.id.au" , "alexandru.elisei@arm.com" , "linux-s390@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "Yamahata, Isaku" , "kvmarm@lists.linux.dev" , "suzuki.poulose@arm.com" , "kvm-riscv@lists.infradead.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mips@vger.kernel.org" , "kvmarm@lists.cs.columbia.edu" , "Gao, Chao" , "atishp@atishpatra.org" , "linux-riscv@lists.infradead.org" Subject: Re: [PATCH 33/44] KVM: x86: Do VMX/SVM support checks directly in vendor code Message-ID: References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-34-seanjc@google.com> <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <95c3cce88560024566f3b4b0061ca7e62a8a4286.camel@intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221115_175617_876284_DBDC4BC5 X-CRM114-Status: GOOD ( 16.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Nov 15, 2022, Huang, Kai wrote: > On Wed, 2022-11-02 at 23:19 +0000, Sean Christopherson wrote: > > +static bool __init kvm_is_vmx_supported(void) > > +{ > > + if (!cpu_has_vmx()) { > > + pr_err("CPU doesn't support VMX\n"); > > + return false; > > + } > > + > > + if (!boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > + =A0=A0=A0 !boot_cpu_has(X86_FEATURE_VMX)) { > > + pr_err("VMX not enabled in MSR_IA32_FEAT_CTL\n"); > > + return false; > > + } > > + > > + return true; > > +} > > + > > =A0static int __init vmx_check_processor_compat(void) > > =A0{ > > =A0 struct vmcs_config vmcs_conf; > > =A0 struct vmx_capability vmx_cap; > > =A0 > > - if (!this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > > - =A0=A0=A0 !this_cpu_has(X86_FEATURE_VMX)) { > > - pr_err("VMX is disabled on CPU %d\n", smp_processor_id()); > > + if (!kvm_is_vmx_supported()) > > =A0 return -EIO; > > - } > > =A0 > = > Looks there's a functional change here -- the old code checks local cpu's > feature bits but the new code always checks bsp's feature bits. Should h= ave no > problem I think, though. Ouch. The bad check will defeat the purpose of doing compat checks. Nice = catch! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel