[Acked] [PATCH 0/3][Xenial SRU] Fix rtc irq race in kvm

[Andy Whitcroft]

On Wed, Dec 14, 2016 at 04:04:18PM -0600, Seth Forshee wrote:
> BugLink: http://bugs.launchpad.net/bugs/1649718
> 
> A race in kvm can cause the EOI signal for the rtc irq to be lost. When
> this happens the guest will never see another rtc intterupt. This is
> causing the kernel's rtc selftest to hang, resulting in an autopkgtest
> failure for the zesty kernel.
> 
> The following three cherry picks from upstream fix this issue.
> 
> Thanks,
> Seth
> 
> 
> Joerg Roedel (3):
>   kvm: x86: Convert ioapic->rtc_status.dest_map to a struct
>   kvm: x86: Track irq vectors in ioapic->rtc_status.dest_map
>   kvm: x86: Check dest_map->vector to match eoi signals for rtc
> 
>  arch/x86/kvm/ioapic.c   | 30 +++++++++++++++++++++---------
>  arch/x86/kvm/ioapic.h   | 17 +++++++++++++++--
>  arch/x86/kvm/irq_comm.c |  2 +-
>  arch/x86/kvm/lapic.c    | 14 ++++++++------
>  arch/x86/kvm/lapic.h    |  7 +++++--
>  5 files changed, 50 insertions(+), 20 deletions(-)

Ugg, looks sane and the failure mode is very testable in ADT.

Acked-by: Andy Whitcroft <apw at canonical.com>

-apw