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

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Message-ID: <cd0f526c-da68-ef59-580f-665ad08a395f@linux.intel.com>
Date:   Wed, 11 Mar 2020 14:50:39 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     baolu.lu@...ux.intel.com, ashok.raj@...el.com,
        jacob.jun.pan@...ux.intel.com, kevin.tian@...el.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Daniel Drake <drake@...lessm.com>,
        Derrick Jonathan <jonathan.derrick@...el.com>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 0/6] Replace private domain with per-group default

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