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xen/events: don't use chip_data for legacy IRQs

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commit 0891fb39ba67bd7ae023ea0d367297ffff010781 upstream.

Since commit c330fb1ddc0a ("XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt XEN data pointer which contains XEN specific information.")
Xen is using the chip_data pointer for storing IRQ specific data. When
running as a HVM domain this can result in problems for legacy IRQs, as
those might use chip_data for their own purposes.

Use a local array for this purpose in case of legacy IRQs, avoiding the
double use.

Cc: stable@vger.kernel.org
Fixes: c330fb1ddc0a ("XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt XEN data pointer which contains XEN specific information.")
Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: Stefan Bader <stefan.bader@canonical.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20200930091614.13660-1-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
[bwh: Backported to 4.9: adjust context]
Signed-off-by: Ben Hutchings <benh@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Juergen Gross 2020-09-30 11:16:14 +02:00 committed by Greg Kroah-Hartman
parent 9be7583938
commit 776bce2df0
1 changed files with 21 additions and 8 deletions
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29
drivers/xen/events/events_base.c
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@ -90,6 +90,8 @@ static bool (*pirq_needs_eoi)(unsigned irq);
/* Xen will never allocate port zero for any purpose. */
#define VALID_EVTCHN(chn) ((chn) != 0)
static struct irq_info *legacy_info_ptrs[NR_IRQS_LEGACY];
static struct irq_chip xen_dynamic_chip;
static struct irq_chip xen_percpu_chip;
static struct irq_chip xen_pirq_chip;
@ -154,7 +156,18 @@ int get_evtchn_to_irq(unsigned evtchn)
/* Get info for IRQ */
struct irq_info *info_for_irq(unsigned irq)
{
return irq_get_chip_data(irq);
if (irq < nr_legacy_irqs())
return legacy_info_ptrs[irq];
else
return irq_get_chip_data(irq);
}
static void set_info_for_irq(unsigned int irq, struct irq_info *info)
{
if (irq < nr_legacy_irqs())
legacy_info_ptrs[irq] = info;
else
irq_set_chip_data(irq, info);
}
/* Constructors for packed IRQ information. */
@ -375,7 +388,7 @@ static void xen_irq_init(unsigned irq)
info->type = IRQT_UNBOUND;
info->refcnt = -1;
irq_set_chip_data(irq, info);
set_info_for_irq(irq, info);
list_add_tail(&info->list, &xen_irq_list_head);
}
@ -424,14 +437,14 @@ static int __must_check xen_allocate_irq_gsi(unsigned gsi)
static void xen_free_irq(unsigned irq)
{
struct irq_info *info = irq_get_chip_data(irq);
struct irq_info *info = info_for_irq(irq);
if (WARN_ON(!info))
return;
list_del(&info->list);
irq_set_chip_data(irq, NULL);
set_info_for_irq(irq, NULL);
WARN_ON(info->refcnt > 0);
@ -601,7 +614,7 @@ EXPORT_SYMBOL_GPL(xen_irq_from_gsi);
static void __unbind_from_irq(unsigned int irq)
{
int evtchn = evtchn_from_irq(irq);
struct irq_info *info = irq_get_chip_data(irq);
struct irq_info *info = info_for_irq(irq);
if (info->refcnt > 0) {
info->refcnt--;
@ -1105,7 +1118,7 @@ int bind_ipi_to_irqhandler(enum ipi_vector ipi,
void unbind_from_irqhandler(unsigned int irq, void *dev_id)
{
struct irq_info *info = irq_get_chip_data(irq);
struct irq_info *info = info_for_irq(irq);
if (WARN_ON(!info))
return;
@ -1139,7 +1152,7 @@ int evtchn_make_refcounted(unsigned int evtchn)
if (irq == -1)
return -ENOENT;
info = irq_get_chip_data(irq);
info = info_for_irq(irq);
if (!info)
return -ENOENT;
@ -1167,7 +1180,7 @@ int evtchn_get(unsigned int evtchn)
if (irq == -1)
goto done;
info = irq_get_chip_data(irq);
info = info_for_irq(irq);
if (!info)
goto done;