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From: Christoph Hellwig <hch@lst.de>
To: Thomas Hellstrom <thellstrom@vmware.com>
Cc: "Tom Lendacky" <thomas.lendacky@amd.com>,
	iommu@lists.linux-foundation.org,
	"Christian König" <christian.koenig@amd.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH 2/2] dma-mapping: force unencryped devices are always addressing limited
Date: Wed, 27 Nov 2019 15:40:06 +0100
Message-ID: <20191127144006.25998-3-hch@lst.de> (raw)
In-Reply-To: <20191127144006.25998-1-hch@lst.de>

Devices that are forced to DMA through unencrypted bounce buffers
need to be treated as if they are addressing limited.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 kernel/dma/mapping.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 1dbe6d725962..f6c35b53d996 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -416,6 +416,8 @@ EXPORT_SYMBOL_GPL(dma_get_merge_boundary);
  */
 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);
 }
-- 
2.20.1

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  parent reply index

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 ` Christoph Hellwig [this message]
2019-11-27 18:22   ` [PATCH 2/2] dma-mapping: force unencryped devices are always addressing limited Thomas Hellstrom via iommu
2019-11-28  7:51     ` hch
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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