Messages in this thread | | | Subject | Re: 4.19-rc3: IOMMU PT warnings: WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:4065 __alloc_pages_slowpath+0xb7b/0xcd0 | From | Robin Murphy <> | Date | Mon, 10 Sep 2018 14:26:30 +0100 |
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On 10/09/18 14:23, Christoph Hellwig wrote: > On Mon, Sep 10, 2018 at 11:16:12AM +0300, Meelis Roos wrote: >> In 4.19-rc1, I found that to keep Intel integrated graphics working when >> VT-d is on, I need to have IOMMU passthough on or GPU init would fail >> with DMAR error and the screen would display static gibberish. So I >> turned IOMMU PT on by default in kernel config. It worked, also in rc2. >> >> Now with rc3, it still works but I get some warning splats in dmesg >> about IOMMU passthrough: > > Any chance you could bisect this down to a specific commit? For > a start it might be worth if it is reproducable with: > > git://git.infradead.org/users/hch/dma-mapping.git dma-mapping-4.19-2 > > which were the only dma-mapping changes post -rc2.
Given the __alloc_pages_slowpath() warning, this looks like it's probably stemming from the oversized PASID table issue which a few other folks have hit too. I think this patch is the most up-to-date fix:
https://www.mail-archive.com/iommu@lists.linux-foundation.org/msg25639.html
Robin.
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