[Qemu-devel] Re: [PATCH 0/4] add NUMA emulation

[Anthony Liguori <anthony@codemonkey.ws>]

Andre Przywara wrote:
> Hi,
>
> the following patches add NUMA emulation to QEMU guests.
> Although the ultimate goal is KVM with host side support, these
> patches are pure QEMU with no host side binding.
> This is a reworked version from end of last year, I adapted the command line
> syntax to Anthony's wishes:
> -numa node[,mem=<size>[MG]][,cpus=<from>[-<to>]][,nodeid=<nr>]
> If we agree to this scheme (which drops mem=from-to and requires at least
> one -numa node for each NUMA node), I will provide more detailed documentation.
> Patch 1/4 adds the -numa command line parameter and sets a QEMU global
> array with the parsed values. If no specific values for memory and CPUs are
> given, all resources will be split equally across all nodes.
> Patch 2/4 adds an "info numa" command to the monitor to output the current
> topology. Since NUMA is advertised via static ACPI tables, no changes are
> possible during runtime.
> Patch 3/4 uses the QEMU firmware configuration interfacce to send the NUMA
> topology to the BIOS, which has to setup the tables. Only one channel is used.
> Patch 4/4 finally adds the BIOS support, which create the appropriate
> SRAT table reflecting the given topology.
>
> Looking forward to any comments.
>   

Other than a few minor comments, it's look really good.

Regards,

Anthony Liguori