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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.033965, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 14/11/24 13:27, Chao Gao wrote: >>> With in-place conversion, QEMU can map shared memory and supply the virtual >>> address to VFIO to set up DMA mappings. From this perspective, in-place >>> conversion doesn't change or require any changes to the way QEMU interacts >>> with VFIO. So, the key for device assignment remains updating DMA mappings >>> accordingly during shared/private conversions. It seems that whether in-place >>> conversion is in use (i.e., whether shared memory is managed by guest_memfd or >>> not) doesn't require big changes to that proposal. Not sure if anyone thinks >>> otherwise. We want to align with you on the direction for device assignment >>> support for guest_memfd. >>> (I set aside the idea of letting KVM manage the IOMMU page table in the above >>> analysis because we probably won't get that support in the near future) >> >> Right. So devices would also only be to access "shared" memory. > > Yes, this is the situation without TDX-Connect support. Even when TDX-Connect > comes into play, devices will initially be attached in shared mode and later > converted to private mode. From this perspective, TDX-Connect will be built on > this shared device assignment proposal. > >> >>> >>> Could you please add this topic to the agenda? >> >> Will do. But I'm afraid the agenda for tomorrow is pretty packed, so we might >> not get to talk about it in more detail before the meeting in 2 weeks. > > Understood. is there any QEMU patch available for in-place conversion? we would > like to play with it and also do some experiments w/ assigned devices. This > might help us identify more potential issues for discussion. Have you found out if there are patches, somewhere? I am interested too. Thanks, -- Alexey