Re: [PATCH 0/6] Replace private domain with per-group default

[Lu Baolu]

Hi Joerg,

On 2020/3/10 19:15, Joerg Roedel wrote:
> Hi Baolu,
>
> On Sat, Mar 07, 2020 at 02:20:08PM +0800, Lu Baolu wrote:
> > Lu Baolu (5):
> >    iommu: Configure default domain with dev_def_domain_type
> >    iommu/vt-d: Don't force 32bit devices to uses DMA domain
> >    iommu/vt-d: Don't force PCI sub-hierarchy to use DMA domain
> >    iommu/vt-d: Add dev_def_domain_type callback
> >    iommu/vt-d: Apply per-device dma_ops
> >
> > Sai Praneeth Prakhya (1):
> >    iommu: Add dev_def_domain_type() callback in iommu_ops
>
> I like this patch-set, but I fear some regressions from patch
> "iommu/vt-d: Don't force 32bit devices to uses DMA domain". Have you
> tested this series on a couple of machines, ideally even older ones from
> the first generation of VT-d hardware?

The oldest hardware I have is Ivy Bridge. :-) Actually, The effect of
using identity domain for 32-bit devices is the same as that of adding
intel_iommu=off in the kernel parameter. Hence, if there is any
regression, people should also find it with intel_iommu=off.
intel_iommu=off support is added at the very beginning of VT-d driver.

Best regards,
baolu