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Hallyn" , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Chao Peng , Fuad Tabba , Jarkko Sakkinen , Yu Zhang , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , Vlastimil Babka , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230719_071514_355506_6FA7C61C X-CRM114-Status: GOOD ( 13.42 ) 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 Wed, Jul 19, 2023, Yuan Yao wrote: > On Tue, Jul 18, 2023 at 04:44:48PM -0700, Sean Christopherson wrote: > > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > > index 90a0be261a5c..d2d3e083ec7f 100644 > > --- a/include/linux/kvm_host.h > > +++ b/include/linux/kvm_host.h > > @@ -255,7 +255,9 @@ bool kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, > > int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu); > > #endif > > > > -#ifdef KVM_ARCH_WANT_MMU_NOTIFIER > > +struct kvm_gfn_range; > > Not sure why a declaration here, it's defined for ARCHs which defined > KVM_ARCH_WANT_MMU_NOTIFIER before. The forward declaration exists to handle cases where CONFIG_KVM=n, specifically arch/powerpc/include/asm/kvm_ppc.h's declaration of hooks to forward calls to uarch modules: 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); Prior to using a Kconfig, a forward declaration wasn't necessary because arch/powerpc/include/asm/kvm_host.h would #define KVM_ARCH_WANT_MMU_NOTIFIER even if CONFIG_KVM=n. Alternatively, kvm_ppc.h could declare the struct. I went this route mainly to avoid the possibility of someone encountering the same problem on a different architecture. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel