Re: APEI: ERST table in ACPI NVS not supported

[Max Asbock <masbock@linux.vnet.ibm.com>]

On 02/04/2013 01:20 AM, Chen Gong wrote:
> On Tue, Jan 29, 2013 at 10:08:11AM -0800, Max Asbock wrote:
>
>
> we have systems that declare the memory range for ERST in ACPI NVS.
> Because ACPI NVS is marked 'busy' by e820_reserve_resources() the
> call to request_mem_region(erst_erange.base, erst_erange.size, "APEI
> ERST") made from erst_init() fails and we get:
> ERST: Can not request iomem region<0x        7e91f000-0x
> 7e920c00>  for ERST.
>
> I did notice that quite some effort was made to add code to avoid
> resource conflicts between APEI and ACPI NVS. But ERST still goes
> straight to request_mem_region() which is bound to fail. I am
> assuming this should go through apei_resources_request() instead or
> I am missing something?
>
> If my understanding is right, after ERST resource is requested via
> apei_resources_request and when requesting error log address range,
> you meet an NVS conflict, right?
>
> If so, NVS must be excluded. But I'm afraid if error range is
> separated into two parts thus some errors will be lost. Would you
> please paste errage address range and conflicted NVS range?
ACPI NVS is:

[    0.000000] BIOS-e820: [mem 0x000000007e6a5000-0x000000007ebc5fff] 
ACPI NVS

ERST erange is:

0x7e91f000-0x7e920c00

which is a single range entirely within ACPI NVS.

thanks,
Max