On 18/12/2015 10:54, Takuya Yoshikawa wrote:
> Not just in order to clean up the code, but to make it faster by using
> enhanced instructions: the initialization became 20-30% faster on our
> testing machine.
>
> Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@xxxxxxxxxxxxx>
Applied locally, but I'm not sure when it will appear on kernel.org...
it depends on the amount of testing I can do next week before the
holidays. Anyway, it's not lost. :)
Paolo
> ---
> arch/x86/kvm/mmu.c | 10 +---------
> 1 file changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index a1a3d19..7f5a82b 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -2041,14 +2041,6 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu,
> }
> }
>
> -static void init_shadow_page_table(struct kvm_mmu_page *sp)
> -{
> - int i;
> -
> - for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
> - sp->spt[i] = 0ull;
> -}
> -
> static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp)
> {
> sp->write_flooding_count = 0;
> @@ -2128,7 +2120,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
> account_shadowed(vcpu->kvm, sp);
> }
> sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen;
> - init_shadow_page_table(sp);
> + clear_page(sp->spt);
> trace_kvm_mmu_get_page(sp, true);
> return sp;
> }
>
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