Re: [RESEND PATCH v5 09/11] KVM: arm64: Flush only the memslot after write-protect

[Gavin Shan]

On 6/22/23 03:50, 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@xxxxxxxxxx>
> ---
>   arch/arm64/kvm/mmu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>

> diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
> index c3ec2141c3284..94f10e670c100 100644
> --- a/arch/arm64/kvm/mmu.c
> +++ b/arch/arm64/kvm/mmu.c
> @@ -992,7 +992,7 @@ 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);
>   }
>   
>   /**