CCing libvir-list.
On Wed, Dec 04, 2013 at 03:58:50PM +0800, Wanlong Gao wrote:
> If the total number of the assigned numa nodes memory is not
> equal to the assigned ram size, it will write the wrong data
> to ACPI talb, then the guest will ignore the wrong ACPI table
> and recognize all memory to one node. It's buggy, we should
> check it to ensure that we write the right data to ACPI table.
>
> Signed-off-by: Wanlong Gao <gaowanlong@xxxxxxxxxxxxxx>
This will make configurations that could be running for years (except
that the guest OS was ignoring the NUMA data) suddenly stop running. I
just want to confirm: we really want that, right?
Does libvirt allow this kind of broken configuration to be generated, or
it already ensures the total NUMA node sizes match RAM size?
> ---
> numa.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/numa.c b/numa.c
> index ce7736a..beda80e 100644
> --- a/numa.c
> +++ b/numa.c
> @@ -150,6 +150,16 @@ void set_numa_nodes(void)
> node_mem[i] = ram_size - usedmem;
> }
>
> + uint64_t numa_total = 0;
> + for (i = 0; i < nb_numa_nodes; i++) {
> + numa_total += node_mem[i];
> + }
> + if (numa_total != ram_size) {
> + fprintf(stderr, "qemu: numa nodes total memory size "
> + "should equal to ram_size\n");
> + exit(1);
> + }
> +
> for (i = 0; i < nb_numa_nodes; i++) {
> if (!bitmap_empty(node_cpumask[i], MAX_CPUMASK_BITS)) {
> break;
> --
> 1.8.5
>
>
--
Eduardo
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