[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Question to mem-path support at QEMU for Xen
On Tue, 26 Jul 2022 15:27:07 +0800 Huang Rui <ray.huang@xxxxxxx> wrote: > Hi Anthony and other Qemu/Xen guys, > > We are trying to enable venus on Xen virtualization platform. And we would > like to use the backend memory with memory-backend-memfd,id=mem1,size=4G > options on QEMU, however, the QEMU will tell us the "-mem-path" is not > supported with Xen. I verified the same function on KVM. > > qemu-system-i386: -mem-path not supported with Xen > > So may I know whether Xen has any limitation that support > memory-backend-memfd in QEMU or just implementation is not done yet? Currently Xen doesn't use guest RAM allocation the way the rest of accelerators do. (it has hacks in memory_region/ramblock API, that divert RAM allocation calls to Xen specific API) The sane way would extend Xen to accept RAM regions (whatever they are ram or fd based) QEMU allocates instead of going its own way. This way it could reuse all memory backends that QEMU provides for the rest of the non-Xen world. (not to mention that we could drop non trivial Xen hacks so that guest RAM handling would be consistent with other accelerators) > Looking forward to your reply! > > Thanks a lot, > Ray >
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