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x86/xen: Allow to retry if cpu_initialize_context() failed.

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If memory allocation in cpu_initialize_context() fails then it will
bring up the VCPU and leave with the corresponding CPU bit set in
xen_cpu_initialized_map.

The following (presumably successful) CPU bring up will BUG in
xen_pv_cpu_up() because nothing for that VCPU would be initialized.

Clear the CPU bits, that were set in cpu_initialize_context() in case
the memory allocation fails.

[ bigeasy: Creating a patch from Boris' email. ]

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220209080214.1439408-2-bigeasy@linutronix.de
This commit is contained in:
Boris Ostrovsky 2022-02-09 09:02:13 +01:00 committed by Thomas Gleixner
parent ce522ba9ef
commit e8a69f12f0
1 changed files with 4 additions and 1 deletions
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5
arch/x86/xen/smp_pv.c
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@ -260,8 +260,11 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
return 0;
ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
if (ctxt == NULL)
if (ctxt == NULL) {
cpumask_clear_cpu(cpu, xen_cpu_initialized_map);
cpumask_clear_cpu(cpu, cpu_callout_mask);
return -ENOMEM;
}
gdt = get_cpu_gdt_rw(cpu);