diff mbox

[Xen-devel,v2] xen: arm: take FIQ exceptions to Xen not guest by setting HCR_EL2.FMO

Message ID 1403772822-32192-1-git-send-email-ian.campbell@citrix.com
State Accepted
Commit 4bb74e39987b428429c2aacad7f59356d4942e39
Headers show

Commit Message

Ian Campbell June 26, 2014, 8:53 a.m. UTC 
As with HCR_EL2.{IMO,AMO} we want to route FIQs to Xen not the guest. See ARM
ARM DDI 0406C.b B1.8.4.

So far none of the platforms which we support use FIQ for anything, but when we
end up supporting one it would be far better to surprise Xen with them than
whatever guest happens to be running...

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
---
v2: Added ARM ARM reference.
---
 xen/arch/arm/traps.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 7f77c56..9bc3198 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -89,8 +89,8 @@  void __cpuinit init_traps(void)
                  CPTR_EL2);
 
     /* Setup hypervisor traps */
-    WRITE_SYSREG(HCR_PTW|HCR_BSU_INNER|HCR_AMO|HCR_IMO|HCR_VM|HCR_TWI|HCR_TSC|
-                 HCR_TAC|HCR_SWIO|HCR_TIDCP, HCR_EL2);
+    WRITE_SYSREG(HCR_PTW|HCR_BSU_INNER|HCR_AMO|HCR_IMO|HCR_FMO|HCR_VM|
+                 HCR_TWI|HCR_TSC|HCR_TAC|HCR_SWIO|HCR_TIDCP, HCR_EL2);
     isb();
 }