[PATCH v6 09/11] KVM: arm64: Flush only the memslot after write-protect

[Shaoqin Huang]

On 7/15/23 08:54, Raghavendra Rao Ananta wrote:
> After write-protecting the region, currently KVM invalidates
> the entire TLB entries using kvm_flush_remote_tlbs(). Instead,
> scope the invalidation only to the targeted memslot. If
> supported, the architecture would use the range-based TLBI
> instructions to flush the memslot or else fallback to flushing
> all of the TLBs.
> 
> Signed-off-by: Raghavendra Rao Ananta <rananta at google.com>
> Reviewed-by: Gavin Shan <gshan at redhat.com>
Reviewed-by: Shaoqin Huang <shahuang at redhat.com>
> ---
>   arch/arm64/kvm/mmu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
> index 387f2215fde7..985f605e2abc 100644
> --- a/arch/arm64/kvm/mmu.c
> +++ b/arch/arm64/kvm/mmu.c
> @@ -1082,7 +1082,7 @@ static void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot)
>   	write_lock(&kvm->mmu_lock);
>   	stage2_wp_range(&kvm->arch.mmu, start, end);
>   	write_unlock(&kvm->mmu_lock);
> -	kvm_flush_remote_tlbs(kvm);
> +	kvm_flush_remote_tlbs_memslot(kvm, memslot);
>   }
>   
>   /**

-- 
Shaoqin