Re: [Crash-utility] [Xen-devel] crash tool - problem with new Xen linear virtual mapped sparse p2m list
On 24/11/15 09:55, Malcolm Crossley wrote:
On 24/11/15 08:59, Jan Beulich wrote:
>>>> On 24.11.15 at 07:55, <JGross(a)suse.com> wrote:
>> What about:
>>
>> 4) Instead of relying on the kernel maintained p2m list for m2p
>> conversion use the hypervisor maintained m2p list which should be
>> available in the dump as well. This is the way the alive kernel is
>> working, so mimic it during crash dump analysis.
>
> I fully agree; I have to admit that looking at the p2m when doing page
> table walks for a PV Dom0 (having all machine addresses in page table
> entries) seems kind of backwards. (But I say this knowing nothing
> about the tool.)
>
I don't think we can reliably use the m2p for PV domains because
PV domains don't always issue a m2p update hypercall when they change
their p2m mapping.
This only applies to foreign pages which won't be very interesting to a
crash tool.
David