Messages in this thread | | | Date | Tue, 28 Oct 2014 14:03:07 +0100 | From | Juergen Gross <> | Subject | Re: [Xen-devel] [PATCH 0/2] xen: Switch to virtual mapped linear p2m list |
| |
On 10/28/2014 01:46 PM, Andrew Cooper wrote: > On 28/10/14 12:44, David Vrabel wrote: >> On 28/10/14 12:42, Andrew Cooper wrote: >>> On 28/10/14 12:39, David Vrabel wrote: >>>> On 28/10/14 12:07, Juergen Gross wrote: >>>>> Okay, back to the original question: is the (up to) 64 MB virtual >>>>> mapping of the p2m list on 32-bit pv domains a problem or not? >>>> I think up-to 64 MiB of vmalloc area is fine. The vmalloc space can be >>>> increased with a command line option in the unlikely event that there >>>> are domUs that would be affected. >>>> >>>>> If yes, the virtual mapped linear p2m list could still be used on >>>>> 64 bit domains, paving the way for support of more than 512 GB of >>>>> domain memory. OTOH having to keep the p2m tree coding alive isn't >>>>> my favorite solution... >>>> Having to keep both the tree and linear p2m code would be awful. Let's >>>> not do this! >>>> >>>> David >>> How is the toolstack expected to find and mutate this p2m on migrate? >>> The toolstack does not use guest pagetables. >> The p2m code maintains two trees. One for use by the guest and one for >> use by the toolstack. This series replaces the first tree with the >> linear array (at least that's how I understand it -- I've not reviewed >> the series in detail yet). > > Ah - fine (if that is how it works).
That's the plan, yes.
Juergen
| |