On Tue, 24 Nov 2015 10:09:01 +0000 David Vrabel <david.vrabel@xxxxxxxxxx> wrote: > 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@xxxxxxxx> 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. True. I think the main reason crash hasn't done this is that it cannot find the hypervisor maintained m2p list. It should be sufficient to add some more fields to XEN_VMCOREINFO, so that crash can locate the mapping in the dump. Petr T -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility
