linux-kernel - [PATCH 4/4] paravirt,xen: correct xen

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Date:   Tue,  5 Sep 2017 15:24:44 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        x86@...nel.org, virtualization@...ts.linux-foundation.org
Cc:     jeremy@...p.org, chrisw@...s-sol.org, akataria@...are.com,
        rusty@...tcorp.com.au, boris.ostrovsky@...cle.com, hpa@...or.com,
        tglx@...utronix.de, mingo@...hat.com, peterz@...radead.org,
        longman@...hat.com, Juergen Gross <jgross@...e.com>
Subject: [PATCH 4/4] paravirt,xen: correct xen_nopvspin case

With the boot parameter "xen_nopvspin" specified a Xen guest should not
make use of paravirt spinlocks, but behave as if running on bare
metal. This is not true, however, as the qspinlock code will fall back
to a test-and-set scheme when it is detecting a hypervisor.

In order to avoid this set the virt_spin_lock pvops function to
_paravirt_false() in case xen_nopvspin has been specified.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/xen/spinlock.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index 25a7c4302ce7..c01cedfa745d 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -129,6 +129,8 @@ void __init xen_init_spinlocks(void)
 
 	if (!xen_pvspin) {
 		printk(KERN_DEBUG "xen: PV spinlocks disabled\n");
+		pv_lock_ops.virt_spin_lock =
+			__PV_IS_CALLEE_SAVE(_paravirt_false);
 		return;
 	}
 	printk(KERN_DEBUG "xen: PV spinlocks enabled\n");
-- 
2.12.3