To make x86 irq allocation to be same with booting path and ioapic
hot add path, We will pre-reserve irq for all gsi at first.
We have to use realloc here, otherwise irq_alloc_desc_at will fail
because bit is already get marked for pre-reserved in irq bitmaps.
Signed-off-by: Yinghai Lu <ying...@kernel.org>
Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Cc: xen-de...@lists.xensource.com
---
drivers/xen/events.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 6a6bbe4..b0caa4e 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -505,8 +505,12 @@ static int __must_check xen_allocate_irq_gsi(unsigned gsi)
/* Legacy IRQ descriptors are already allocated by the arch. */
if (gsi < NR_IRQS_LEGACY)
irq = gsi;
- else
- irq = irq_alloc_desc_at(gsi, -1);
+ else {
+ /* for x86, irq already get reserved for gsi */
+ irq = irq_realloc_desc_at(gsi, -1);
+ if (irq < 0)
+ irq = irq_alloc_desc_at(gsi, -1);
+ }
xen_irq_init(irq);
--
1.8.1.4
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