(CC REST maintainers)
Hello Dirk,
Please CC the relevant maintainers for this patch. You can use
scripts/get_maintainers.pl for this purpose.
On 19/04/16 06:59, Dirk Behme wrote:
On ARM64 Linux the HVC instruction is used to trap into Xen. As this
can be set only at EL3, i.e. outside from Xen, document this boot
requirement.
Signed-off-by: Dirk Behme <dirk.be...@de.bosch.com>
---
docs/misc/arm/booting.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/docs/misc/arm/booting.txt b/docs/misc/arm/booting.txt
index 9802e5e..ffc9029 100644
--- a/docs/misc/arm/booting.txt
+++ b/docs/misc/arm/booting.txt
@@ -23,6 +23,10 @@ The exceptions to this on 32-bit ARM are as follows:
There are no exception on 64-bit ARM.
+On ARM64 Linux it has to be ensured that the Secure Configuration
+Register has the HVC instructions enabled at EL1 and above
+(SCR_EL3.HCE == 1).
The requirement is the same for ARM32 (SCR.HCE == 1).
I would create a specific section in this documentation to list what the
firmware should do in EL3 before starting Xen.
In addition to this patch, I would add a check in Xen to make sure the
Hyp calls have been enabled by the firmware.
Regards,
+
[1] linux/Documentation/arm/Booting
Latest version:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm/Booting
--
Julien Grall
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