Hi Julien, > On 24 Oct 2023, at 12:28, Julien Grall <[email protected]> wrote: > > From: Julien Grall <[email protected]> > > 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/[email protected] > > Signed-off-by: Julien Grall <[email protected]> > Reviewed-by: Michal Orzel <[email protected]>
Reviewed-by: Bertrand Marquis <[email protected]> Cheers Bertrand > > --- > > Changes in v2: > - The limit is 2 TiB no 5 > - Remove unnecessary sentence in the docs > - Add missing link > - Add Michal's reviewed-by > > I couldn't find a nice way to document it in SUPPORT.md. So I decided > to only document the restrict in docs/misc/arm/booting.txt for now. > > I also couldn't find any way from GRUB/UEFI (I didn't look much) to > specify the loading address. > --- > 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 > -------------- > -- > 2.40.1 >
