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Re: [Xen-devel] [BUG] After upgrade to Xen 4.12.0 iommu=no-igfx
- To: Roman Shaposhnik <roman@xxxxxxxxxx>
- From: Jan Beulich <JBeulich@xxxxxxxx>
- Date: Wed, 31 Jul 2019 08:34:18 +0000
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- Cc: Juergen Gross <JGross@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "boris.ostrovsky@xxxxxxxxxx" <boris.ostrovsky@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 31 Jul 2019 08:51:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [Xen-devel] [BUG] After upgrade to Xen 4.12.0 iommu=no-igfx
On 30.07.2019 19:56, Roman Shaposhnik wrote:
> On Fri, Jul 26, 2019 at 1:06 AM Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>
>> On 23.07.2019 20:25, Roman Shaposhnik wrote:
>>> Interestingly enough, adding iommu_inclusive_mapping=1 AND iommu=debug
>>> booted the system just fine.
>>
>> Btw (I've noticed this only now) - are you saying without "iommu=debug"
>> the box does _not_ boot fine, despite the other option?
>
> Yes. But it made sense to me since iommu=debug (as per your
> explanation) overwhelms the CPU and I guess adding
> iommu_inclusive_mapping=1 avoids the code path that does it?
I'm afraid I don't follow: My question was whether
"iommu_inclusive_mapping=1" alone would not allow the box to boot.
Without "iommu=debug" there's no excessive logging afaict, no
matter what other IOMMU options you use.
Jan
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