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| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2020-05-08 18:28:43 -0400 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2020-05-21 13:01:45 -0500 |
| commit | c54b071c192dfe8061336f650ceaf358e6386e0b (patch) | |
| tree | 27b3c225e7d9b5c9a07f11607aa11f8a06fd592e /drivers/xen/cpu_hotplug.c | |
| parent | c17db64044e34ae6c2df56cc4837787f9d48edd5 (diff) | |
| download | linux-c54b071c192dfe8061336f650ceaf358e6386e0b.tar.bz2 | |
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/cpu_hotplug.c')
| -rw-r--r-- | drivers/xen/cpu_hotplug.c | 8 |
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); |