Messages in this thread | | | Date | Thu, 19 Nov 2020 08:54:22 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH v5] swiotlb: Adjust SWIOTBL bounce buffer size for SEV guests. |
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On Wed, Nov 18, 2020 at 08:12:43PM +0000, Ashish Kalra wrote: > From: Ashish Kalra <ashish.kalra@amd.com> > > For SEV, all DMA to and from guest has to use shared > (un-encrypted) pages. SEV uses SWIOTLB to make this > happen without requiring changes to device drivers. > However, depending on workload being run, the default > 64MB of SWIOTLB might not be enough and SWIOTLB > may run out of buffers to use for DMA, resulting > in I/O errors and/or performance degradation for > high I/O workloads.
FYI, you can use up 73 chars for your commit log. This looks rather compressed.
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