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From: Christoph Hellwig <hch@lst.de>
To: Meelis Roos <mroos@linux.ee>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
	Christoph Hellwig <hch@lst.de>,
	iommu@lists.linux-foundation.org
Subject: Re: 4.19-rc3: IOMMU PT warnings: WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:4065 __alloc_pages_slowpath+0xb7b/0xcd0
Date: Mon, 10 Sep 2018 15:23:04 +0200	[thread overview]
Message-ID: <20180910132304.GA20244@lst.de> (raw)
In-Reply-To: <alpine.LRH.2.21.1809101111040.31938@math.ut.ee>

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.

  reply	other threads:[~2018-09-10 13:18 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-10  8:16 Meelis Roos
2018-09-10 13:23 ` Christoph Hellwig [this message]
2018-09-10 13:26   ` Robin Murphy
2018-09-10 14:07     ` Meelis Roos
2018-09-10 14:36       ` Robin Murphy

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