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xen-devel
[Xen-devel] [PATCH 4/9] xen: Add support to check if IRQ line is shared
We do this via the PHYSDEVOP_irq_status_query support hypervisor call.
We will get a positive value if another domain has binded its
PIRQ to the specified IRQ line.
[v2: Deal with v2.6.37-rc1 rebase fallout]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
drivers/xen/events.c | 13 +++++++++++++
include/xen/events.h | 3 +++
2 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 96c93e7..690dfad 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -1398,6 +1398,19 @@ void xen_poll_irq(int irq)
xen_poll_irq_timeout(irq, 0 /* no timeout */);
}
+/* Check whether the IRQ line is shared with other guests. */
+int xen_ignore_irq(int irq)
+{
+ struct irq_info *info = info_for_irq(irq);
+ struct physdev_irq_status_query irq_status = { .irq =
+ info->u.pirq.gsi };
+
+ if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
+ return 0;
+ return !(irq_status.flags & XENIRQSTAT_shared);
+}
+EXPORT_SYMBOL_GPL(xen_ignore_irq);
+
void xen_irq_resume(void)
{
unsigned int cpu, irq, evtchn;
diff --git a/include/xen/events.h b/include/xen/events.h
index 646dd17..553c664 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -89,4 +89,7 @@ int xen_vector_from_irq(unsigned pirq);
/* Return gsi allocated to pirq */
int xen_gsi_from_irq(unsigned pirq);
+/* Determine whether to ignore this IRQ if passed to a guest. */
+int xen_ignore_irq(int irq);
+
#endif /* _XEN_EVENTS_H */
--
1.7.1
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- [Xen-devel] [PATCH v2] Xen PCI backend driver., Konrad Rzeszutek Wilk
- [Xen-devel] [PATCH 3/9] xen: Check if the PCI device is owned by a domain different than DOMID_SELF., Konrad Rzeszutek Wilk
- [Xen-devel] [PATCH 6/9] pci/xen: Make xen_[find|register|unregister]_domain_owner be _GPL, Konrad Rzeszutek Wilk
- [Xen-devel] [PATCH 9/9] xen/xen-pciback: Swap over to DEFINE_PCI_DEVICE_TABLE, Konrad Rzeszutek Wilk
- [Xen-devel] [PATCH 8/9] xen/pciback: Fix checkpatch warnings and errors., Konrad Rzeszutek Wilk
- [Xen-devel] [PATCH 4/9] xen: Add support to check if IRQ line is shared with other domains.,
Konrad Rzeszutek Wilk <=
- [Xen-devel] [PATCH 2/9] xen/pci: Add xen_[find|register|unregister]_device_domain_owner functions., Konrad Rzeszutek Wilk
- [Xen-devel] [PATCH 5/9] xen: implement bind_interdomain_evtchn_to_irqhandler for backend drivers, Konrad Rzeszutek Wilk
- [Xen-devel] [PATCH 7/9] xen-pciback: Backend driver for Xen pci-front., Konrad Rzeszutek Wilk
- [Xen-devel] [PATCH 1/9] xen: export xen_gsi_from_irq, it is required by modular pciback, Konrad Rzeszutek Wilk
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