Re: [RFC PATCH] dma: swiotlb: Size shared default pools for memory encryption

Jason Gunthorpe <[email protected]>
Newsgroups org.ozlabs.lists.linuxppc-dev,dev.linux.lists.iommu,dev.linux.lists.linux-coco,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel,org.kernel.vger.linux-s390
Message-ID <[email protected]> 
On Wed, Aug 12, 2026 at 06:25:49PM +0100, Catalin Marinas wrote:
> > > BTW, why does arm64 report CC_ATTR_MEM_ENCRYPT instead of the GUEST
> > > option in realms?
> 
> It's still not clear to me why we went for CC_ATTR_MEM_ENCRYPT instead
> of CC_ATTR_GUEST_MEM_ENCRYPT.

Yeah, this tune should be only for CC guests that have the
shared/private issue.

The AMD SME issue with the address width on bare metal is an entirely
different problem that would need a different kind of tuning.

Jason
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