Revert "xen/spinlock: Disable IRQ spinlock (PV) allocation on PVHVM"

This reverts commit 70dd4998cb85f0ecd6ac892cc7232abefa432efb.

Now that the bugs have been resolved we can re-enable the
PV ticketlock implementation under PVHVM Xen guests.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>

diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index e1bff87766be6ce782a9b288d3df65d9b16da553..b3c1ee8f09935e61de7c59e61e192cfa9fc95e44 100644 (file)
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -230,13 +230,6 @@ void xen_init_lock_cpu(int cpu)
        WARN(per_cpu(lock_kicker_irq, cpu) >= 0, "spinlock on CPU%d exists on IRQ%d!\n",
             cpu, per_cpu(lock_kicker_irq, cpu));
 
-       /*
-        * See git commit f10cd522c5fbfec9ae3cc01967868c9c2401ed23
-        * (xen: disable PV spinlocks on HVM)
-        */
-       if (xen_hvm_domain())
-               return;
-
        name = kasprintf(GFP_KERNEL, "spinlock%d", cpu);
        irq = bind_ipi_to_irqhandler(XEN_SPIN_UNLOCK_VECTOR,
                                     cpu,
@@ -256,13 +249,6 @@ void xen_init_lock_cpu(int cpu)
 
 void xen_uninit_lock_cpu(int cpu)
 {
-       /*
-        * See git commit f10cd522c5fbfec9ae3cc01967868c9c2401ed23
-        * (xen: disable PV spinlocks on HVM)
-        */
-       if (xen_hvm_domain())
-               return;
-
        if (!xen_pvspin)
                return;
 
@@ -275,12 +261,6 @@ void xen_uninit_lock_cpu(int cpu)
 
 void __init xen_init_spinlocks(void)
 {
-       /*
-        * See git commit f10cd522c5fbfec9ae3cc01967868c9c2401ed23
-        * (xen: disable PV spinlocks on HVM)
-        */
-       if (xen_hvm_domain())
-               return;
 
        if (!xen_pvspin) {
                printk(KERN_DEBUG "xen: PV spinlocks disabled\n");