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authorBoris Ostrovsky <boris.ostrovsky@oracle.com>2020-05-09 01:28:43 +0300
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2020-05-21 21:01:45 +0300
commitc54b071c192dfe8061336f650ceaf358e6386e0b (patch)
tree27b3c225e7d9b5c9a07f11607aa11f8a06fd592e /drivers/xen
parentc17db64044e34ae6c2df56cc4837787f9d48edd5 (diff)
downloadlinux-c54b071c192dfe8061336f650ceaf358e6386e0b.tar.xz
xen/cpuhotplug: Fix initial CPU offlining for PV(H) guests
Commit a926f81d2f6c ("xen/cpuhotplug: Replace cpu_up/down() with device_online/offline()") replaced cpu_down() with device_offline() call which requires that the CPU has been registered before. This registration, however, happens later from topology_init() which is called as subsys_initcall(). setup_vcpu_hotplug_event(), on the other hand, is invoked earlier, during arch_initcall(). As result, booting a PV(H) guest with vcpus < maxvcpus causes a crash. Move setup_vcpu_hotplug_event() (and therefore setup_cpu_watcher()) to late_initcall(). In addition, instead of performing all offlining steps in setup_cpu_watcher() simply call disable_hotplug_cpu(). Fixes: a926f81d2f6c (xen/cpuhotplug: Replace cpu_up/down() with device_online/offline()" Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/1588976923-3667-1-git-send-email-boris.ostrovsky@oracle.com Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/cpu_hotplug.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/xen/cpu_hotplug.c b/drivers/xen/cpu_hotplug.c
index ec975decb5de..b96b11e2b571 100644
--- a/drivers/xen/cpu_hotplug.c
+++ b/drivers/xen/cpu_hotplug.c
@@ -93,10 +93,8 @@ static int setup_cpu_watcher(struct notifier_block *notifier,
(void)register_xenbus_watch(&cpu_watch);
for_each_possible_cpu(cpu) {
- if (vcpu_online(cpu) == 0) {
- device_offline(get_cpu_device(cpu));
- set_cpu_present(cpu, false);
- }
+ if (vcpu_online(cpu) == 0)
+ disable_hotplug_cpu(cpu);
}
return NOTIFY_DONE;
@@ -119,5 +117,5 @@ static int __init setup_vcpu_hotplug_event(void)
return 0;
}
-arch_initcall(setup_vcpu_hotplug_event);
+late_initcall(setup_vcpu_hotplug_event);