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&gt; 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.