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SubjectRe: [PATCH] Revert "KVM: Eliminate extra function calls in kvm_get_dirty_log_protect()"
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On 02/02/19 10:20, lantianyu1986@gmail.com wrote:
> From: Lan Tianyu <Tianyu.Lan@microsoft.com>
>
> The value of "dirty_bitmap[i]" is already check before setting its value
> to mask. The following check of "mask" is redundant. The check of "mask" was
> introduced by commit 58d2930f4ee3(("KVM: Eliminate extra function calls in
> kvm_get_dirty_log_protect()"). This patch is to revert the patch.
>
> Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
> ---
> virt/kvm/kvm_main.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 2bdc827b9ee9..ef06cfb9b52b 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -1200,11 +1200,9 @@ int kvm_get_dirty_log_protect(struct kvm *kvm,
> mask = xchg(&dirty_bitmap[i], 0);
> dirty_bitmap_buffer[i] = mask;
>
> - if (mask) {
> - offset = i * BITS_PER_LONG;
> - kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
> - offset, mask);
> - }
> + offset = i * BITS_PER_LONG;
> + kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
> + offset, mask);
> }
> spin_unlock(&kvm->mmu_lock);
> }
>

Queued, thanks.

Paolo

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