[Xen-devel] [PATCH 05/10] xen/arm: vgic-v3: Document the current restrictions

[Julien Grall <julien.grall@xxxxxxxxxx>]

The current vGIC v3 driver doesn't fully implement GICv3 spec:
    - GICv3 backward compatibility is not supported (GICD_CTLR.ARE = 0)
    - A processor can only access his own redistributor. For buggy
    assumption, the current code bank the redistributors MMIO.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/vgic-v3.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/arch/arm/vgic-v3.c b/xen/arch/arm/vgic-v3.c
index 1fa1413..9818a6b 100644
--- a/xen/arch/arm/vgic-v3.c
+++ b/xen/arch/arm/vgic-v3.c
@@ -16,6 +16,11 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
+ *
+ * Current limitation of the vGIC v3:
+ *      - GICv2 backward compatibility is not supported (GICD_CTRL.ARE = 0)
+ *      - A processor can only access his own redistributor. For buggy
+ *      assumption, the current code bank the redistributors MMIO
  */
 
 #include <xen/bitops.h>
-- 
2.1.4


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