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Mon, 30 Oct 2023 09:38:12 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGZEMK/0a4y6GRranfUYFosow/+q05YMqexgnrNudyg+ulCeoJJOVHXdjy3BiTQsTruKVMBhA== X-Received: by 2002:a05:600c:4f53:b0:3fa:934c:8356 with SMTP id m19-20020a05600c4f5300b003fa934c8356mr8459576wmq.10.1698683892541; Mon, 30 Oct 2023 09:38:12 -0700 (PDT) Received: from [192.168.1.174] ([151.81.68.207]) by smtp.googlemail.com with ESMTPSA id m1-20020a05600c4f4100b004063d8b43e7sm13252825wmq.48.2023.10.30.09.37.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Oct 2023 09:38:11 -0700 (PDT) Message-ID: <09966596-397a-47c6-8f43-610a1013d34a@redhat.com> Date: Mon, 30 Oct 2023 17:37:42 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 07/35] KVM: Convert KVM_ARCH_WANT_MMU_NOTIFIER to CONFIG_KVM_GENERIC_MMU_NOTIFIER To: Sean Christopherson , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Viro , Christian Brauner , "Matthew Wilcox (Oracle)" , Andrew Morton References: <20231027182217.3615211-1-seanjc@google.com> <20231027182217.3615211-8-seanjc@google.com> From: Paolo Bonzini Autocrypt: addr=pbonzini@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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: kvm@vger.kernel.org, David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Chao Peng , linux-riscv@lists.infradead.org, Isaku Yamahata , Xiaoyao Li , Wang , Fuad Tabba , linux-arm-kernel@lists.infradead.org, Maciej Szmigiero , Michael Roth , Ackerley Tng , David Matlack , Vlastimil Babka , =?UTF-8?B?TWlja2HDq2wgU2FsYcO8?= =?UTF-8?Q?n?= , Isaku Yamahata , Quentin Perret , kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, Jarkko Sakkinen , Yu Zhang , "Kirill A . Shutemov" , kvm-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, Liam Merwick , Vishal A nnapurve , linuxppc-dev@lists.ozlabs.org, Xu Yilun , Anish Moorthy Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 10/27/23 20:21, Sean Christopherson wrote: > Convert KVM_ARCH_WANT_MMU_NOTIFIER into a Kconfig and select it where > appropriate to effectively maintain existing behavior. Using a proper > Kconfig will simplify building more functionality on top of KVM's > mmu_notifier infrastructure. > > Add a forward declaration of kvm_gfn_range to kvm_types.h so that > including arch/powerpc/include/asm/kvm_ppc.h's with CONFIG_KVM=n doesn't > generate warnings due to kvm_gfn_range being undeclared. PPC defines > hooks for PR vs. HV without guarding them via #ifdeffery, e.g. > > bool (*unmap_gfn_range)(struct kvm *kvm, struct kvm_gfn_range *range); > bool (*age_gfn)(struct kvm *kvm, struct kvm_gfn_range *range); > bool (*test_age_gfn)(struct kvm *kvm, struct kvm_gfn_range *range); > bool (*set_spte_gfn)(struct kvm *kvm, struct kvm_gfn_range *range); > > Alternatively, PPC could forward declare kvm_gfn_range, but there's no > good reason not to define it in common KVM. The new #define should also imply KVM_CAP_SYNC_MMU, or even: KVM_CAP_SYNC_MMU should just be enabled by all architectures at this point. You don't need to care about it, I have a larger series for caps that are enabled by all architectures and I'll post it for 6.8. Reviewed-by: Paolo Bonzini Paolo