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([2001:b07:6468:f312:9af8:e5f5:7516:fa89]) by smtp.googlemail.com with ESMTPSA id f9-20020a056402068900b0051495ce23absm1517006edy.10.2023.06.09.02.06.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 09 Jun 2023 02:06:04 -0700 (PDT) Message-ID: Date: Fri, 9 Jun 2023 11:06:02 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH mm-unstable v2 09/10] kvm/x86: add kvm_arch_test_clear_young() Content-Language: en-US To: Yu Zhao , Andrew Morton Cc: Alistair Popple , Anup Patel , Ben Gardon , Borislav Petkov , Catalin Marinas , Chao Peng , Christophe Leroy , Dave Hansen , Fabiano Rosas , Gaosheng Cui , Gavin Shan , "H. Peter Anvin" , Ingo Molnar , James Morse , "Jason A. Donenfeld" , Jason Gunthorpe , Jonathan Corbet , Marc Zyngier , Masami Hiramatsu , Michael Ellerman , Michael Larabel , Mike Rapoport , Nicholas Piggin , Oliver Upton , Paul Mackerras , Peter Xu , Sean Christopherson , Steven Rostedt , Suzuki K Poulose , Thomas Gleixner , Thomas Huth , Will Deacon , Zenghui Yu , kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, linux-mm@google.com References: <20230526234435.662652-1-yuzhao@google.com> <20230526234435.662652-10-yuzhao@google.com> From: Paolo Bonzini In-Reply-To: <20230526234435.662652-10-yuzhao@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/27/23 01:44, Yu Zhao wrote: > +#define kvm_arch_has_test_clear_young kvm_arch_has_test_clear_young > +static inline bool kvm_arch_has_test_clear_young(void) > +{ > + return IS_ENABLED(CONFIG_X86_64) && > + (!IS_REACHABLE(CONFIG_KVM) || (tdp_mmu_enabled && shadow_accessed_mask)); > +} I don't think you need IS_REACHABLE(CONFIG_KVM) here, it would be a bug if this is called from outside KVM code. Maybe make it a BUILD_BUG_ON? Paolo