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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