On Fri, 24 Aug 2012 15:54:59 -0300
Marcelo Tosatti <[email protected]> wrote:

> Other arches do not need this.
> 
> Signed-off-by: Marcelo Tosatti <[email protected]>
> 
> Index: kvm/arch/x86/kvm/x86.c
> ===================================================================
> --- kvm.orig/arch/x86/kvm/x86.c
> +++ kvm/arch/x86/kvm/x86.c
> @@ -6455,6 +6455,14 @@ void kvm_arch_commit_memory_region(struc
>               kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
>       kvm_mmu_slot_remove_write_access(kvm, mem->slot);
>       spin_unlock(&kvm->mmu_lock);
> +     /*
> +      * If the new memory slot is created, we need to clear all
> +      * mmio sptes.
> +      */
> +     if (old.npages == 0 && npages) {
> +             kvm_mmu_zap_all(kvm);
> +             kvm_reload_remote_mmus(kvm);
> +     }
>  }

Any explanation why (old.base_gfn != new.base_gfn) case can be
omitted?

Takuya

>  
>  void kvm_arch_flush_shadow_all(struct kvm *kvm)
> Index: kvm/virt/kvm/kvm_main.c
> ===================================================================
> --- kvm.orig/virt/kvm/kvm_main.c
> +++ kvm/virt/kvm/kvm_main.c
> @@ -849,13 +849,6 @@ int __kvm_set_memory_region(struct kvm *
>  
>       kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
>  
> -     /*
> -      * If the new memory slot is created, we need to clear all
> -      * mmio sptes.
> -      */
> -     if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
> -             kvm_arch_flush_shadow_all(kvm);
> -
>       kvm_free_physmem_slot(&old, &new);
>       kfree(old_memslots);
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