On June 16, 2022 1:51 PM, Gerd Hoffmann wrote: > > > Tom Lendacky's suggestion for SEV-SNP is to pre-accept all memory > > > under 4GB to make all that complexity go away. Only this approach > > > worked in my own testing. With the MMIO hole it's just validating 3GB of > memory. > > Accepting all memory under 4GB will make the things much simpler. In this > way I think the accept-on-demand maybe not needed. > > A question: is there some performance impact when accepting all memory > under 4GB? > > That would certainly be easiest when it is acceptable from a performance > point of view. Will also simplify the code because you don't have to split > the > low memory block into accepted/unaccepted parts. > > It'll be 3G (-machine pc) or 2G (-machine q35) of memory. > Is it possible to accept gigabyte pages btw? Currently the supported page size are 4K and 2M. Gigabyte page size has not been supported. > > And, yes, this might be enough that accept-on-demand is not needed any > more.
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