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xen/events: avoid using info_for_irq() in xen_send_IPI_one()

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xen_send_IPI_one() is being used by cpuhp_report_idle_dead() after
it calls rcu_report_dead(), meaning that any RCU usage by
xen_send_IPI_one() is a bad idea.

Unfortunately xen_send_IPI_one() is using notify_remote_via_irq()
today, which is using irq_get_chip_data() via info_for_irq(). And
irq_get_chip_data() in turn is using a maple-tree lookup requiring
RCU.

Avoid this problem by caching the ipi event channels in another
percpu variable, allowing the use notify_remote_via_evtchn() in
xen_send_IPI_one().

Fixes: 721255b982 ("genirq: Use a maple tree for interrupt descriptor management")
Reported-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: David Woodhouse <dwmw@amazon.co.uk>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2023-10-24 13:51:36 +02:00
parent b85ea95d08
commit e64e7c74b9
1 changed files with 8 additions and 4 deletions
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12
drivers/xen/events/events_base.c
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@ -164,6 +164,8 @@ static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
/* IRQ <-> IPI mapping */
static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
/* Cache for IPI event channels - needed for hot cpu unplug (avoid RCU usage). */
static DEFINE_PER_CPU(evtchn_port_t [XEN_NR_IPIS], ipi_to_evtchn) = {[0 ... XEN_NR_IPIS-1] = 0};
/* Event channel distribution data */
static atomic_t channels_on_cpu[NR_CPUS];
@ -366,6 +368,7 @@ static int xen_irq_info_ipi_setup(unsigned cpu,
info->u.ipi = ipi;
per_cpu(ipi_to_irq, cpu)[ipi] = irq;
per_cpu(ipi_to_evtchn, cpu)[ipi] = evtchn;
return xen_irq_info_common_setup(info, irq, IRQT_IPI, evtchn, 0);
}
@ -981,6 +984,7 @@ static void __unbind_from_irq(unsigned int irq)
break;
case IRQT_IPI:
per_cpu(ipi_to_irq, cpu)[ipi_from_irq(irq)] = -1;
per_cpu(ipi_to_evtchn, cpu)[ipi_from_irq(irq)] = 0;
break;
case IRQT_EVTCHN:
dev = info->u.interdomain;
@ -1632,7 +1636,7 @@ EXPORT_SYMBOL_GPL(evtchn_put);
void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
{
int irq;
evtchn_port_t evtchn;
#ifdef CONFIG_X86
if (unlikely(vector == XEN_NMI_VECTOR)) {
@ -1643,9 +1647,9 @@ void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
return;
}
#endif
irq = per_cpu(ipi_to_irq, cpu)[vector];
BUG_ON(irq < 0);
notify_remote_via_irq(irq);
evtchn = per_cpu(ipi_to_evtchn, cpu)[vector];
BUG_ON(evtchn == 0);
notify_remote_via_evtchn(evtchn);
}
struct evtchn_loop_ctrl {