Re: [Qemu-devel] [RFC QEMU PATCH v4 00/10] Implement vNVDIMM for Xen HVM guest

[Anthony PERARD]

On Thu, Dec 07, 2017 at 06:18:02PM +0800, Haozhong Zhang wrote:
> This is the QEMU part patches that works with the associated Xen
> patches to enable vNVDIMM support for Xen HVM domains. Xen relies on
> QEMU to build guest NFIT and NVDIMM namespace devices, and allocate
> guest address space for vNVDIMM devices.

I've got other question, and maybe possible improvements.

When QEMU build the ACPI tables, it also initialize some MemoryRegion,
which use more guest memory. Do you know if those regions are used with
your patch series on Xen? Otherwise, we could try to avoid their
creation with this:
In xenfv_machine_options()
m->rom_file_has_mr = false;
(setting this in xen_hvm_init() would probably be better, but I havn't
try)

If this is possible, libxl would not need to allocate more memory for
the guest (dm_acpi_size).

-- 
Anthony PERARD