There are firmware tables out describing the ITS but does not support
LPIs. This will result to a data abort when trying to initialize ITS.
While this can be consider a bug in the Device-Tree, same configuration
boots on Linux. So gate the ITS initialization with the support of LPIs
in the distributor.
Signed-off-by: Julien Grall <julien.gr...@linaro.org>
---
xen/arch/arm/gic-v3.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index 9f9cf59f82..730450e34b 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1637,6 +1637,11 @@ static unsigned long
gicv3_get_hwdom_extra_madt_size(const struct domain *d)
}
#endif
+static bool gic_dist_supports_lpis(void)
+{
+ return (readl_relaxed(GICD + GICD_TYPER) & GICD_TYPE_LPIS);
+}
+
/* Set up the GIC */
static int __init gicv3_init(void)
{
@@ -1699,9 +1704,12 @@ static int __init gicv3_init(void)
gicv3_dist_init();
- res = gicv3_its_init();
- if ( res )
- panic("GICv3: ITS: initialization failed: %d\n", res);
+ if ( gic_dist_supports_lpis() )
+ {
+ res = gicv3_its_init();
+ if ( res )
+ panic("GICv3: ITS: initialization failed: %d\n", res);
+ }
res = gicv3_cpu_init();
if ( res )
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
