While checking Utopic I found
commit 434d59e0718f5fdf91ff9a9bb6c98887e42ba912
Author: David Vrabel <[email protected]>
Date: Tue Aug 5 11:49:19 2014 +0100
x86/xen: use vmap() to map grant table pages in PVH guests
commit 7d951f3ccb0308c95bf76d5eef9886dea35a7013 upstream.
Commit b7dd0e350e0b (x86/xen: safely map and unmap grant frames when
in atomic context) causes PVH guests to crash in
arch_gnttab_map_shared() when they attempted to map the pages for the
grant table.
Not sure PVH is considered to be working with Trusty (12.04) but if yes,
this sounds like it might be backport to be requested. David?
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https://bugs.launchpad.net/bugs/1350373
Title:
Kernel BUG in paravirt_enter_lazy_mmu when running as a Xen PV guest
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