Re: [PATCH v3 1/5] arm64/smmu: Use TLBI ASID when invalidating entire range

[Jason Gunthorpe]

On Thu, Jul 20, 2023 at 06:39:23PM +1000, Alistair Popple wrote:
> The ARM SMMU has a specific command for invalidating the TLB for an
> entire ASID. Currently this is used for the IO_PGTABLE API but not for
> ATS when called from the MMU notifier.
> 
> The current implementation of notifiers does not attempt to invalidate
> such a large address range, instead walking each VMA and invalidating
> each range individually during mmap removal. However in future SMMU
> TLB invalidations are going to be sent as part of the normal
> flush_tlb_*() kernel calls. To better deal with that add handling to
> use TLBI ASID when invalidating the entire address space.
> 
> Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason