From 5415b2b2118bd78d8a04f276a8312f7f0cb1a466 Mon Sep 17 00:00:00 2001 From: Julien Grall Date: Tue, 24 Oct 2023 11:28:58 +0100 Subject: [PATCH] docs/arm: Document where Xen should be loaded in memory In commit 9d267c049d92 ("xen/arm64: Rework the memory layout"), we decided to require Xen to be loaded below 2 TiB to simplify the logic to enable the MMU. The limit was decided based on how known platform boot plus some slack. We had a recent report that this is not sufficient on the AVA platform with a old firmware [1]. But the restriction is not going to change in Xen 4.18. So document the limit clearly in docs/misc/arm/booting.txt. [1] https://lore.kernel.org/20231013122658.1270506-3-leo.yan@linaro.org Signed-off-by: Julien Grall Reviewed-by: Michal Orzel Reviewed-by: Bertrand Marquis Release-acked-by: Henry Wang --- docs/misc/arm/booting.txt | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/docs/misc/arm/booting.txt b/docs/misc/arm/booting.txt index 02f7bb65ec6d..547f58a7d981 100644 --- a/docs/misc/arm/booting.txt +++ b/docs/misc/arm/booting.txt @@ -21,7 +21,9 @@ The exceptions to this on 32-bit ARM are as follows: zImage protocol should still be used and not the stricter "raw (non-zImage)" protocol described in arm/Booting. -There are no exception on 64-bit ARM. +The exceptions to this on 64-bit ARM are as follows: + + Xen binary should be loaded in memory below 2 TiB. Booting Guests --------------