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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2012-05-21 19:54:10 +0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-05-21 22:11:36 +0400
commit68c2c39a76b094e9b2773e5846424ea674bf2c46 (patch)
treeb3959303806a6228adbbab234c474e16c81738ba /include
parent201a52bea928687b7557728b176ac4f8a37d5cbd (diff)
downloadlinux-68c2c39a76b094e9b2773e5846424ea674bf2c46.tar.xz
xen: do not map the same GSI twice in PVHVM guests.
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. CC: stable@kernel.org Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'include')
-rw-r--r--include/xen/events.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/xen/events.h b/include/xen/events.h
index 0f773708e02c..04399b28e821 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);