[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Question to mem-path support at QEMU for Xen
Hi Igor, Appreciate you for the reply! On Wed, Jul 27, 2022 at 04:19:30PM +0800, Igor Mammedov wrote: > 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) I am new for Xen and QEMU, we are working on GPU. We would like to have a piece of backend memroy like video memory for VirtIO GPU to support guest VM Mesa Vulkan (Venus). Do you mean we can the memory_region/ramblock APIs to work around it? > > 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) > May I know what do you mean by "going its own way"? This sounds good, could you please elaborate on how can we implement this? We would like to give a try to address the problem on Xen. Would you mind to point somewhere that I can learn and understand the RAM region. Very happy to see your suggestions! Thanks & Best Regards, Ray
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