Hi,
On 02/06/2025 23:36, Stefano Stabellini wrote:
On Fri, 30 May 2025, Edgar E. Iglesias wrote:
From: "Edgar E. Iglesias" <edgar.igles...@amd.com>
Add the trap-unmapped-accesses per-domain fdt property.
Signed-off-by: Edgar E. Iglesias <edgar.igles...@amd.com>
---
docs/misc/arm/device-tree/booting.txt | 10 ++++++++++
xen/arch/arm/dom0less-build.c | 9 ++++++++-
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/docs/misc/arm/device-tree/booting.txt
b/docs/misc/arm/device-tree/booting.txt
index 59fa96a82e..9add6440de 100644
--- a/docs/misc/arm/device-tree/booting.txt
+++ b/docs/misc/arm/device-tree/booting.txt
@@ -225,6 +225,16 @@ with the following properties:
option is provided with a non zero value, but the platform doesn't support
SVE.
+- trap-unmapped-accesses
+
+ Optional. An integer that configures handling of accesses to unmapped
+ address ranges.
+ If set to 0, guest accesses will read all bits as ones, e.g 0xFFFFFFFF
+ for a 32bit access and writes will be ignored.
+ If set to 1, guest accesses will trap.
+
+ This option is only implemented for ARM where the default is 1.
Please expand it to: "This option is only implemented for ARM where the
default is 1 when trap-unmapped-accesses is absent."
I am confused. The document is part of "docs/misc/arm" and some options
like "sve" are Arm specific. We don't mention this is Arm only because
the documention is Arm specific.
I know that RISC-V is starting to share the bindings. So really (part
of) the documentation should be moved to common. Until then, I think it
is misleading to add "is only implemented for ARM".
BTW, the spelling for should be "Arm" ;).
Cheers,
--
Julien Grall
