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Subject[PATCH 5/5] Revert "xen/spinlock: Disable IRQ spinlock (PV) allocation on PVHVM"
Date
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>
---
arch/x86/xen/spinlock.c | 20 --------------------
1 file changed, 20 deletions(-)

diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index e1bff87..b3c1ee8 100644
--- 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");
--
1.8.3.1


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