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xen: Do not enable PV IPIs when vector callback not present

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commit 3c05c4bed4 upstream.

Fix regression for HVM case on older (<4.1.1) hypervisors caused by

  commit 99bbb3a84a
  Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
  Date:   Thu Dec 2 17:55:10 2010 +0000

    xen: PV on HVM: support PV spinlocks and IPIs

This change replaced the SMP operations with event based handlers without
taking into account that this only works when the hypervisor supports
callback vectors. This causes unexplainable hangs early on boot for
HVM guests with more than one CPU.

BugLink: http://bugs.launchpad.net/bugs/791850

Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-and-Reported-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Stefano Stabellini
2011-08-17 15:15:00 +02:00
committed by Greg Kroah-Hartman
parent 1561007953
commit 6aaaf4e6f9
1 changed files with 2 additions and 2 deletions
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4
arch/x86/xen/smp.c
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@@ -521,8 +521,6 @@ static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
native_smp_prepare_cpus(max_cpus);
WARN_ON(xen_smp_intr_init(0));
if (!xen_have_vector_callback)
return;
xen_init_lock_cpu(0);
xen_init_spinlocks();
}
@@ -546,6 +544,8 @@ static void xen_hvm_cpu_die(unsigned int cpu)
void __init xen_hvm_smp_init(void)
{
if (!xen_have_vector_callback)
return;
smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
smp_ops.cpu_up = xen_hvm_cpu_up;