From: David Rientjes <rientjes@google.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Thomas Lendacky <thomas.lendacky@amd.com>,
Brijesh Singh <brijesh.singh@amd.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Robin Murphy <robin.murphy@arm.com>,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: [patch for-5.8 4/4] dma-direct: add missing set_memory_decrypted() for coherent mapping
Date: Thu, 11 Jun 2020 12:20:32 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.22.394.2006111220010.153880@chino.kir.corp.google.com> (raw)
In-Reply-To: <alpine.DEB.2.22.394.2006111218200.153880@chino.kir.corp.google.com>
When a coherent mapping is created in dma_direct_alloc_pages(), it needs
to be decrypted if the device requires unencrypted DMA before returning.
Fixes: 3acac065508f ("dma-mapping: merge the generic remapping helpers
into dma-direct")
Cc: stable@vger.kernel.org # 5.5+
Signed-off-by: David Rientjes <rientjes@google.com>
---
kernel/dma/direct.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -195,6 +195,12 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
__builtin_return_address(0));
if (!ret)
goto out_free_pages;
+ if (force_dma_unencrypted(dev)) {
+ err = set_memory_decrypted((unsigned long)ret,
+ 1 << get_order(size));
+ if (err)
+ goto out_free_pages;
+ }
memset(ret, 0, size);
goto done;
}
next prev parent reply other threads:[~2020-06-11 19:20 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-11 19:20 [patch for-5.8 0/4] dma-direct: dma_direct_alloc_pages() fixes for AMD SEV David Rientjes
2020-06-11 19:20 ` [patch for-5.8 1/4] dma-direct: always align allocation size in dma_direct_alloc_pages() David Rientjes
2020-06-15 6:54 ` Christoph Hellwig
2020-06-11 19:20 ` [patch for-5.8 2/4] dma-direct: re-encrypt memory if dma_direct_alloc_pages() fails David Rientjes
2020-06-15 6:56 ` Christoph Hellwig
2020-06-11 19:20 ` [patch for-5.8 3/4] dma-direct: check return value when encrypting or decrypting memory David Rientjes
2020-06-11 19:20 ` David Rientjes [this message]
2020-06-15 7:00 ` [patch for-5.8 4/4] dma-direct: add missing set_memory_decrypted() for coherent mapping Christoph Hellwig
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