On Thu, 22 Sep 2022 01:32:10 +0100,
Gavin Shan <gshan@xxxxxxxxxx> wrote:
>
> Not all architectures like ARM64 need to override the function. Move
> its declaration to kvm_dirty_ring.h to avoid the following compiling
> warning on ARM64 when the feature is enabled.
>
> arch/arm64/kvm/../../../virt/kvm/dirty_ring.c:14:12: \
> warning: no previous prototype for 'kvm_cpu_dirty_log_size' \
> [-Wmissing-prototypes] \
> int __weak kvm_cpu_dirty_log_size(void)
>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
> ---
> arch/x86/include/asm/kvm_host.h | 2 --
> arch/x86/kvm/mmu/mmu.c | 2 ++
> include/linux/kvm_dirty_ring.h | 1 +
> 3 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 2c96c43c313a..4c0fd517282b 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -2082,8 +2082,6 @@ static inline int kvm_cpu_get_apicid(int mps_cpu)
> #define GET_SMSTATE(type, buf, offset) \
> (*(type *)((buf) + (offset) - 0x7e00))
>
> -int kvm_cpu_dirty_log_size(void);
> -
> int memslot_rmap_alloc(struct kvm_memory_slot *slot, unsigned long npages);
>
> #define KVM_CLOCK_VALID_FLAGS \
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index e418ef3ecfcb..b3eb6a3627ec 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -1349,10 +1349,12 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
> kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask);
> }
>
> +#ifdef CONFIG_HAVE_KVM_DIRTY_RING
I think you can drop the ifdeffery, as HAVE_KVM_DIRTY_RING is
unconditionally selected by the arch Kconfig.
> int kvm_cpu_dirty_log_size(void)
> {
> return kvm_x86_ops.cpu_dirty_log_size;
> }
> +#endif
>
> bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
> struct kvm_memory_slot *slot, u64 gfn,
> diff --git a/include/linux/kvm_dirty_ring.h b/include/linux/kvm_dirty_ring.h
> index 906f899813dc..8c6755981c9b 100644
> --- a/include/linux/kvm_dirty_ring.h
> +++ b/include/linux/kvm_dirty_ring.h
> @@ -71,6 +71,7 @@ static inline bool kvm_dirty_ring_soft_full(struct kvm_dirty_ring *ring)
>
> #else /* CONFIG_HAVE_KVM_DIRTY_RING */
>
> +int kvm_cpu_dirty_log_size(void);
> u32 kvm_dirty_ring_get_rsvd_entries(void);
> int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size);
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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