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

["Roger Pau Monné" <roger.pau@citrix.com>]

On 02/05/14 16:16, Jan Beulich wrote:
>>>> On 02.05.14 at 16:06, <roger.pau@citrix.com> 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
>> (XEN) Trying to access 0x40000000 <- Printed from vioapic_range.
>>
>> In this case 0x40000000 falls in range reported as usable RAM by Xen:
>>
>> SMAP type=01 base=0000000000100000 len=000000003ff6e000
>>
>> Which goes from
>>
>> [0x100000, 0x4006e000]
> 
> Which is quite odd a range (I realize that I implied the original pair
> to be a range, when it was a (start,length) tuple). I suppose the
> above is being printed by your kernel - what does the hypervisor
> print regarding the layout?

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.

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.

Roger.