diff options
| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2012-05-21 16:54:10 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-01 15:18:25 +0800 |
| commit | 474d1f4678a679a98eaf53801e7f95c61ae9daa7 (patch) | |
| tree | 55949e1184861437b1d4c6a3cb5cd8ab89f29034 /include | |
| parent | 284e7be895509cdaf9f58e2f789c00b5e9da2244 (diff) | |
xen: do not map the same GSI twice in PVHVM guests.
commit 68c2c39a76b094e9b2773e5846424ea674bf2c46 upstream.
PV on HVM guests map GSIs into event channels. At restore time the
event channels are resumed by restore_pirqs.
Device drivers might try to register the same GSI again through ACPI at
restore time, but the GSI has already been mapped and bound by
restore_pirqs. This patch detects these situations and avoids
mapping the same GSI multiple times.
Without this patch we get:
(XEN) irq.c:2235: dom4: pirq 23 or emuirq 28 already mapped
and waste a pirq.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/xen/events.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/xen/events.h b/include/xen/events.h index 0f773708e02..04399b28e82 100644 --- a/include/xen/events.h +++ b/include/xen/events.h @@ -103,6 +103,9 @@ int xen_irq_from_pirq(unsigned pirq); /* Return the pirq allocated to the irq. */ int xen_pirq_from_irq(unsigned irq); +/* Return the irq allocated to the gsi */ +int xen_irq_from_gsi(unsigned gsi); + /* Determine whether to ignore this IRQ if it is passed to a guest. */ int xen_test_irq_shared(int irq); |