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[34.168.104.7]) by smtp.gmail.com with ESMTPSA id nn6-20020a17090b38c600b00219f8eb271fsm131413pjb.5.2022.12.05.13.12.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Dec 2022 13:12:43 -0800 (PST) Date: Mon, 5 Dec 2022 21:12:39 +0000 From: Sean Christopherson To: Isaku Yamahata Cc: Paolo Bonzini , Marc Zyngier , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Matthew Rosato , Eric Farman , Vitaly Kuznetsov , David Woodhouse , Paul Durrant , James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Atish Patra , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Yuan Yao , Cornelia Huck , Isaku Yamahata , Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= , Fabiano Rosas , Michael Ellerman , Kai Huang , Chao Gao , Thomas Gleixner Subject: Re: [PATCH v2 31/50] KVM: x86: Do CPU compatibility checks in x86 code Message-ID: References: <20221130230934.1014142-1-seanjc@google.com> <20221130230934.1014142-32-seanjc@google.com> <20221205205246.GA3630770@ls.amr.corp.intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20221205205246.GA3630770@ls.amr.corp.intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221205_131248_189151_57C4E66C X-CRM114-Status: GOOD ( 18.16 ) 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="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Dec 05, 2022, Isaku Yamahata wrote: > On Wed, Nov 30, 2022 at 11:09:15PM +0000, > > index 66f16458aa97..3571bc968cf8 100644 > > --- a/arch/x86/kvm/x86.c > > +++ b/arch/x86/kvm/x86.c > > @@ -9277,10 +9277,36 @@ static inline void kvm_ops_update(struct kvm_x86_init_ops *ops) > > kvm_pmu_ops_update(ops->pmu_ops); > > } > > > > +struct kvm_cpu_compat_check { > > + struct kvm_x86_init_ops *ops; > > + int *ret; > > minor nitpick: just int ret. I don't see the necessity of the pointer. > Anyway overall it looks good to me. ... > > @@ -9360,6 +9386,14 @@ static int __kvm_x86_vendor_init(struct kvm_x86_init_ops *ops) > > if (r != 0) > > goto out_mmu_exit; > > > > + c.ret = &r; > > + c.ops = ops; > > + for_each_online_cpu(cpu) { > > + smp_call_function_single(cpu, kvm_x86_check_cpu_compat, &c, 1); > > + if (r < 0) > > Here it can be "c.ret < 0". No, because the below goto leads to "return r", i.e. "c.ret" needs to be propagated to "r". That's why the code does the admittedly funky "int *ret" thing. FWIW, this gets cleanup in the end. "struct kvm_cpu_compat_check" goes away and "&r" is passed directly to kvm_x86_check_cpu_compat. > > + goto out_hardware_unsetup; _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel