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From: "hch@lst.de" <hch@lst.de>
To: Thomas Hellstrom <thellstrom@vmware.com>
Cc: "thomas.lendacky@amd.com" <thomas.lendacky@amd.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"hch@lst.de" <hch@lst.de>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"christian.koenig@amd.com" <christian.koenig@amd.com>
Subject: Re: [PATCH 2/2] dma-mapping: force unencryped devices are always addressing limited
Date: Thu, 28 Nov 2019 08:51:53 +0100
Message-ID: <20191128075153.GD20659@lst.de> (raw)
In-Reply-To: <a95d9115fc2a80de2f97f001bbcd9aba6636e685.camel@vmware.com>

On Wed, Nov 27, 2019 at 06:22:57PM +0000, Thomas Hellstrom wrote:
> >  bool dma_addressing_limited(struct device *dev)
> >  {
> > +	if (force_dma_unencrypted(dev))
> > +		return true;
> >  	return min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) <
> >  			    dma_get_required_mask(dev);
> >  }
> 
> Any chance to have the case
> 
> (swiotlb_force == SWIOTLB_FORCE)
> 
> also included?

We have a hard time handling that in generic code.  Do we have any
good use case for SWIOTLB_FORCE not that we have force_dma_unencrypted?
I'd love to be able to get rid of it..
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Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27 14:40 make dma_addressing_limited work for memory encryption setups Christoph Hellwig
2019-11-27 14:40 ` [PATCH 1/2] dma-mapping: move dma_addressing_limited out of line Christoph Hellwig
2019-11-27 17:13   ` Matthew Wilcox
2019-11-27 14:40 ` [PATCH 2/2] dma-mapping: force unencryped devices are always addressing limited Christoph Hellwig
2019-11-27 18:22   ` Thomas Hellstrom via iommu
2019-11-28  7:51     ` hch [this message]
2019-11-28  8:02       ` Thomas Hellstrom via iommu
2019-11-28 15:36         ` hch
2019-12-04 13:03 make dma_addressing_limited work for memory encryption setups v2 Christoph Hellwig
2019-12-04 13:03 ` [PATCH 2/2] dma-mapping: force unencryped devices are always addressing limited Christoph Hellwig
2019-12-06 14:10   ` Thomas Hellstrom via iommu

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