Re: [Xen-devel] [V10 PATCH 0/4] pvh dom0 patches...

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 02.05.14 at 16:35, <roger.pau@xxxxxxxxxx> wrote:
> On 02/05/14 16:16, Jan Beulich wrote:
>>>>> On 02.05.14 at 16:06, <roger.pau@xxxxxxxxxx> wrote:
>>> My bad, I've incorrectly printed this as 0x%lu instead of %lx, the
>>> following output is correct:
>>>
>>> SMAP type=01 base=0000000000000000 len=0000000000092400
>>> SMAP type=02 base=00000000000f0000 len=0000000000010000
>>> SMAP type=01 base=0000000000100000 len=000000003ff6e000
>>> SMAP type=04 base=00000000dfdf9c00 len=0000000000052000
>>> SMAP type=03 base=00000000dfe4bc00 len=0000000000002000
>>> SMAP type=02 base=00000000dfe4dc00 len=00000000001b2400
>>> SMAP type=02 base=00000000f8000000 len=0000000005000000
>>> SMAP type=02 base=00000000fe000000 len=0000000000d00400
>>> SMAP type=02 base=00000000fee00000 len=0000000000100000
>>> SMAP type=02 base=00000000ffb00000 len=0000000000500000
>>> SMAP type=02 base=0000000100000000 len=00000000a0000000

Considering the hypervisor view below, this range clearly is then
wrong here too, ...

> Maybe the problem is on FreeBSD, and I'm not correctly clamping the e820
> memory map returned by Xen. Right now I'm using start_info->nr_pages as
> the number of valid RAM pages assigned to Dom0, but it is not clear if
> start_info->nr_pages also takes into account the holes and invalid
> regions in the e820 memory map.

i.e. yes, there must be some kind of problem in your handling in any
case.

> This is the hw memory map reported by Xen:
> 
> (XEN) Xen-e820 RAM map:
> (XEN)  0000000000000000 - 0000000000092400 (usable)
> (XEN)  00000000000f0000 - 0000000000100000 (reserved)
> (XEN)  0000000000100000 - 00000000dfdf9c00 (usable)
> (XEN)  00000000dfdf9c00 - 00000000dfe4bc00 (ACPI NVS)
> (XEN)  00000000dfe4bc00 - 00000000dfe4dc00 (ACPI data)
> (XEN)  00000000dfe4dc00 - 00000000e0000000 (reserved)
> (XEN)  00000000f8000000 - 00000000fd000000 (reserved)
> (XEN)  00000000fe000000 - 00000000fed00400 (reserved)
> (XEN)  00000000fee00000 - 00000000fef00000 (reserved)
> (XEN)  00000000ffb00000 - 0000000100000000 (reserved)
> (XEN)  0000000100000000 - 00000001a0000000 (usable)
> 
> And the Dom0 is assigned 1024M of RAM.

I.e. it can have pages at or beyond 0x40000000 only if some other
region is unpopulated.

Jan


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