Re: [Xen-devel] [PATCH 4/4] hvmloader: add support to load extra ACPI tables from qemu

[Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>]

On 01/21/2016 04:53 PM, Jan Beulich wrote:
> > > > On 21.01.16 at 09:25, <guangrong.xiao@xxxxxxxxxxxxxxx> wrote:
> > On 01/21/2016 04:18 PM, Jan Beulich wrote:
> > > Yes. But then - other than you said above - it still looks to me as
> > > if the split between PMEM and PBLK is arranged for by firmware?
> > Yes. But OS/Hypervisor is not excepted to dynamically change its configure
> > (re-split),
> > i,e, for PoV of OS/Hypervisor, it is static.
> Exactly, that has been my understanding. And hence the PMEM part
> could be under the hypervisor's control, while the PBLK part could be
> Dom0's responsibility.
I am not sure if i have understood your point. What your suggestion is that
leave PMEM for hypervisor and all other parts (PBLK and _DSM handling) to
Dom0? If yes, we should:
a) handle hotplug in hypervisor (new PMEM add/remove) that causes hyperivsor
   interpret ACPI SSDT/DSDT.
b) some _DSMs control PMEM so you should filter out these kind of _DSMs and
   handle them in hypervisor.
c) hypervisor should mange PMEM resource pool and partition it to multiple
   VMs.


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