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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id p11sm3043022edt.22.2021.05.24.09.18.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 May 2021 09:18:59 -0700 (PDT) To: Sean Christopherson , Vitaly Kuznetsov Cc: kvm@vger.kernel.org, Wanpeng Li , Jim Mattson , Maxim Levitsky , Kechen Lu , linux-kernel@vger.kernel.org References: <20210518144339.1987982-1-vkuznets@redhat.com> <20210518144339.1987982-4-vkuznets@redhat.com> From: Paolo Bonzini Subject: Re: [PATCH v2 3/5] KVM: x86: Use common 'enable_apicv' variable for both APICv and AVIC Message-ID: <12eadbce-f688-77a1-27bf-c33fee2e7543@redhat.com> Date: Mon, 24 May 2021 18:18:58 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18/05/21 22:39, Sean Christopherson wrote: >> +/* enable / disable AVIC */ >> +static int avic; >> +module_param(avic, int, 0444); > We should opportunistically make avic a "bool". > And also: diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 11714c22c9f1..48cb498ff070 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -185,9 +185,12 @@ module_param(vls, int, 0444); static int vgif = true; module_param(vgif, int, 0444); -/* enable / disable AVIC */ -static int avic; -module_param(avic, int, 0444); +/* + * enable / disable AVIC. Because the defaults differ for APICv + * support between VMX and SVM we cannot use module_param_named. + */ +static bool avic; +module_param(avic, bool, 0444); bool __read_mostly dump_invalid_vmcb; module_param(dump_invalid_vmcb, bool, 0644); @@ -1013,11 +1016,7 @@ static __init int svm_hardware_setup(void) nrips = false; } - if (!npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC)) - avic = false; - - /* 'enable_apicv' is common between VMX/SVM but the defaults differ */ - enable_apicv = avic; + enable_apicv = avic && npt_enabled && boot_cpu_has(X86_FEATURE_AVIC); if (enable_apicv) { pr_info("AVIC enabled\n"); The "if" can come back when AVIC is enabled by default. Paolo