On Wed, May 07, 2025 at 02:23:02PM +0200, Michal Suchánek wrote:
> Hello,
>
> On Wed, May 07, 2025 at 02:36:57PM +0530, Amit Machhiwal wrote:
> > Hi Michal,
> >
> > I can recreate this issue on sles16 distro kernel but I don't observe this
> > issue
> > with upstream Linux 6.15-rc5 on the **same** sles16 guest.
> >
> > Note: the commit 6aa989ab2bd0 ("powerpc/pseries/iommu: memory notifier
> > incorrectly adds TCEs for pmemory") was included since Linux 6.15-rc1.
>
> Indeed, it's not reproducible with 6.15-rc5.
>
> It's not clear what changed in TCE handling between 6.12 and 6.15 that
> avoids this problem.
Seems backporting commit 67dfc11982f7 ("powerpc/pseries/iommu: create
DDW for devices with DMA mask less than 64-bits") avoids the problem but
it's not clear why.
Thanks
Michal
