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[91.219.240.2]) by smtp.gmail.com with ESMTPSA id t1sm1367352wma.43.2020.02.24.15.12.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Feb 2020 15:12:23 -0800 (PST) From: Vitaly Kuznetsov To: Sean Christopherson Cc: Paolo Bonzini , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 16/61] KVM: x86: Encapsulate CPUID entries and metadata in struct In-Reply-To: <20200224215551.GL29865@linux.intel.com> References: <20200201185218.24473-1-sean.j.christopherson@intel.com> <20200201185218.24473-17-sean.j.christopherson@intel.com> <87y2swq95k.fsf@vitty.brq.redhat.com> <20200224215551.GL29865@linux.intel.com> Date: Tue, 25 Feb 2020 00:12:22 +0100 Message-ID: <87imjvmvft.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sean Christopherson writes: > On Fri, Feb 21, 2020 at 03:58:47PM +0100, Vitaly Kuznetsov wrote: >> Sean Christopherson writes: >> > >> > + if (!entry) >> > goto out; >> > } >> > break; >> > @@ -802,22 +814,22 @@ static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function, >> > return r; >> > } >> > >> > -static int do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 func, >> > - int *nent, int maxnent, unsigned int type) >> > +static int do_cpuid_func(struct kvm_cpuid_array *array, u32 func, >> > + unsigned int type) >> > { >> > - if (*nent >= maxnent) >> > + if (array->nent >= array->maxnent) >> > return -E2BIG; >> > >> > if (type == KVM_GET_EMULATED_CPUID) >> > - return __do_cpuid_func_emulated(entry, func, nent, maxnent); >> > + return __do_cpuid_func_emulated(array, func); >> >> Would it make sense to move 'if (array->nent >= array->maxnent)' check >> to __do_cpuid_func_emulated() to match do_host_cpuid()? > > I considered doing exactly that. IIRC, I opted not to because at this > point in the series, the initial call to do_host_cpuid() is something like > halfway down the massive __do_cpuid_func(), and eliminating the early check > didn't feel quite right, e.g. there is a fair amount of unnecessary code > that runs before hitting the first do_host_cpuid(). > > What if I add a patch towards the end of the series to move this check into > __do_cpuid_func_emulated(), i.e. after __do_cpuid_func() has been trimmed > down to size and the early check really is superfluous. > Works for me, thanks! -- Vitaly