Ubuntu
linux-lts-vivid package

  1. Vivid (15.04)
  2. Bug #1583960
  3. Comment #2

Comment 2 for bug 1583960

Revision history for this message
Philipp Hahn (pmhahn) wrote :

Correct me if I'm wrong, but <http://xenbits.xen.org/xsa/advisory-176.html> is a *Xen* Bug, not a *Linux-Kernel* Bug: "xen/arch/x86/mm/guest_walk.c" is in the Hypervisor part of Xen.

I tried to back-port the bug to xen-4.1.6.1 from Precise but the patch is not applicable directly, as xen-4.1 does not seem to support 1GiB super pages; it was only introduced in xen-4.2:

$ git l1 -1 96b740e2
96b740e x86/mm: Handle 1GiB superpages in the pagetable walker.
$ git describe --contains 96b740e2
4.2.0-rc1~1863

I don't know what would happen if xen-4.1 would run on a CPU supporting 1GiB large pages.
Either 1GiB SP should be disabled are 96b740e2 needs to be back-ported as a pre-requisite for 46699c7393bd991234b5642763c5c24b6b39a6c4