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Re: [PATCH v2 2/2] s390x/pci: only limit DMA aperture if vfio DMA limit
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From: |
Matthew Rosato |
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Subject: |
Re: [PATCH v2 2/2] s390x/pci: only limit DMA aperture if vfio DMA limit reported |
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Date: |
Mon, 13 Nov 2023 16:49:34 -0500 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 |
On 11/13/23 4:24 PM, Michael Tokarev wrote:
> 10.11.2023 20:51, Matthew Rosato wrote:
>> If the host kernel lacks vfio DMA limit reporting, do not attempt
>> to shrink the guest DMA aperture.
>>
>> Fixes: df202e3ff3 ("s390x/pci: shrink DMA aperture to be bound by vfio DMA
>> limit")
>> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
>
> Is this stable-8.1 material?
>
> Thanks,
>
> /mjt
>
Yes, I believe it is (sorry, should have added CC stable)
If you have a host kernel that doesn't report the vfio DMA limit the resulting
PCI device will be rendered unusable in the s390x guest due this bug.
Thanks,
Matt