On Tue, 2023-05-09 at 11:55 +0200, Paolo Bonzini wrote: > Hi all! > > We are planning on submitting a CFP to host a KVM Microconference at > Linux Plumbers Conference 2023. To help justify the proposal, we would > like to gather a list of folks that would likely attend, and crowdsource > a list of topics to include in the proposal. Hi Paolo, This MC sounds great! There are two topics I'd be keen to discuss, both in the KVM + memory-management realm: 1. Guest and kernel memory persistence across kexec for live update. Specifically focussing on the host IOMMU pgtable persistence for DMA- passthrough devices to support kexec while guest-driven DMA is still running. There is some discussion happening now about this [1] and hopefully the discussion and prototyping will continue in the run up to LPC. 2. Supporting more fine-grain memory management and access control APIs for the virtualisation case specifically, for use-cases around live migration, memory oversubscription, and "side-car" virtual machines. These use cases would benefit from kernel support for things like dynamically updating IOMMU and MMU permissions independently at fine granularity, all without actually modifying the VMAs, to support fine-grain handling. And linking this topic to the one above: being able to do these things when not backed by struct pages. (There may be some overlap with "KVM guest private memory" [2] here...) Would definitely be keen on this MC! JG [1] https://lore.kernel.org/linux-mm/a4f62a8e1b0f43db005cc1117c06c00e6c0c85ff.camel@xxxxxxxxxx/T/#m20c6df3d755cb79b6c426f7d9a02cec37d21e73e [2] https://lore.kernel.org/lkml/20221202061347.1070246-1-chao.p.peng@xxxxxxxxxxxxxxx/T/
