Commit f10cd522 authored Sep 06, 2011 by Stefano Stabellini Committed by Konrad Rzeszutek Wilk Sep 08, 2011

xen: disable PV spinlocks on HVM



PV spinlocks cannot possibly work with the current code because they are
enabled after pvops patching has already been done, and because PV
spinlocks use a different data structure than native spinlocks so we
cannot switch between them dynamically. A spinlock that has been taken
once by the native code (__ticket_spin_lock) cannot be taken by
__xen_spin_lock even after it has been released.

Reported-and-Tested-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

parent ed467e69

arch/x86/xen/smp.c

+0 −1

Original line number	Original line	Diff line number	Diff line
	@@ -532,7 +532,6 @@ static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
	WARN_ON(xen_smp_intr_init(0));		WARN_ON(xen_smp_intr_init(0));

	xen_init_lock_cpu(0);		xen_init_lock_cpu(0);
	xen_init_spinlocks();
	}		}

	static int __cpuinit xen_hvm_cpu_up(unsigned int cpu)		static int __cpuinit xen_hvm_cpu_up(unsigned int cpu)