On 2015/2/4 6:40, Tony Luck wrote:
> Can't post this part yet because it uses things in an upcoming[*] ACPI, UEFI,
> or some
> other four-letter-ending-in-I standard. So just imagine a call someplace
> early
> in startup that reads information about mirrored address ranges and does:
>
Hi Tony,
Does the upcoming[*] ACPI will add a new flag in SRAT tables? just like memory
hotplug.
#define ACPI_SRAT_MEM_HOT_PLUGGABLE (1<<1) /* 01: Memory region is hot
pluggable */
+#define ACPI_SRAT_MEM_MIRROR (1<<3) /* 03: Memory region is
mirrored */
acpi_numa_memory_affinity_init()
...
hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
+ mirrorable = ma->flags & ACPI_SRAT_MEM_MIRROR;
...
+ if (mirrorable)
+ memblock_mark_mirror(start, size);
...
Thanks,
Xishi Qiu
> + for (...) {
> + start = ...;
> + size = ...;
> + if (it looks mirrored)
> + memblock_mark_mirror(start, size);
> + }
>
> Whole patch is pretty tiny:
>
> 3 files changed, 19 insertions(+)
>
> How much damage could I possibly do in just 19 lines?
>
> -Tony
>
> [*] very soon, I'm told
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