On 2019/1/14 下午5:50, Christoph Hellwig wrote:
On Mon, Jan 14, 2019 at 05:41:56PM +0800, Jason Wang wrote:
On 2019/1/11 下午5:15, Joerg Roedel wrote:
On Fri, Jan 11, 2019 at 11:29:31AM +0800, Jason Wang wrote:
Just wonder if my understanding is correct IOMMU_PLATFORM must be set for
all virtio devices under AMD-SEV guests?
Yes, that is correct. Emulated DMA can only happen on the SWIOTLB
aperture, because that memory is not encrypted. The guest bounces the
data then to its encrypted memory.
Regards,
Joerg
Thanks, have you tested vhost-net in this case. I suspect it may not work
Which brings me back to my pet pevee that we need to take actions
that virtio uses the proper dma mapping API by default with quirks
for legacy cases. The magic bypass it uses is just causing problems
over problems.
Yes, I fully agree with you. This is probably an exact example of such
problem.
Thanks
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