Re: [PATCH v3 17/19] iommu/amd: Access/Dirty bit support in IOPTEs

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Hi Joao,

On 10/18/2023 5:04 AM, Joao Martins wrote:
On 17/10/2023 20:03, Joao Martins wrote:
On 17/10/2023 19:49, Jason Gunthorpe wrote:
On Tue, Oct 17, 2023 at 07:32:31PM +0100, Joao Martins wrote:

Jason, how do we usually handle this cross trees? check_feature() doesn't exist
in your tree, but it does in Joerg's tree; meanwhile
check_feature_on_all_iommus() gets renamed to check_feature(). Should I need to
go with it, do I rebase against linux-next? I have been assuming that your tree
must compile; or worst-case different maintainer pull each other's trees.

We didn't make any special preparation to speed this, so I would wait
till next cycle to take the AMD patches

Thus we should look at the vt-d patches if this is to go in this
cycle.

Alternatively: I can check the counter directly to replicate the amd_iommu_efr
check under the current helper I made (amd_iommu_hd_support) and then change it
after the fact... That should lead to less dependencies?

Or this

I think I'll go with this (once Suravee responds)


Or just keep current code -- which is valid -- at this point and doesn't involve
replicating anything


We could keep the code for now. It should not break anything functionally. Then, once the check_feature() stuff is in place, we can propose a follow up change to keep things consistent :)

Thanks,
Suravee



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