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Subject[PATCH] Bug-fixes to enable PV ticketlock to work under Xen PVHVM with Linux v3.12. (v1)
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After a bit of false starts, lots of debugging, and tons of help from Stefano and
David on how event mechanism is suppose to work I am happy to present a set
of bug-fixes that make PV ticketlocks work under Xen PVHVM with Linux v3.12.

v3.12 has now thanks to commit 816434ec4a674fcdb3c2221a6dffdc8f34020550
(Merge branch 'x86-spinlocks-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip)
PV ticketlocks. That means:
- Xen PV bytelock has been replaced by Xen PV ticketlock.
- Xen PVHVM is using ticketlock (not PV variant) - this patch makes it PV.
- baremetal is still using ticketlocks.

In other words everything in the kernel is ticketlock based with the virtualizations
having the 'PV' part to aid.

Please take a look at the patches. If you are interested in testing them
out I will post a git tree on Monday based on v3.11 and v3.12-rc0.

Note that I had not run any performance tests and I am not sure when I will
be able to (got other bugs to squash now). I've asked our internal performance
engineer to do some benchmarking - but those results won't be available for
some time as it takes time to do good benchmarking.

arch/x86/xen/enlighten.c | 1 -
arch/x86/xen/smp.c | 17 +++++++++++++++++
arch/x86/xen/spinlock.c | 45 ++++++++-------------------------------------
3 files changed, 25 insertions(+), 38 deletions(-)

(oh neat, more deletions!)

Konrad Rzeszutek Wilk (5):
xen/spinlock: Fix locking path engaging too soon under PVHVM.
xen/spinlock: We don't need the old structure anymore
xen/smp: Update pv_lock_ops functions before alternative code starts under PVHVM
xen/spinlock: Don't setup xen spinlock IPI kicker if disabled.
Revert "xen/spinlock: Disable IRQ spinlock (PV) allocation on PVHVM"



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