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Re: [PATCH] SUPPORT.MD: Correct the amount of physical memory supported for Arm
- To: Julien Grall <julien@xxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Wed, 27 Apr 2022 13:51:03 +0000
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Wed, 27 Apr 2022 13:51:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH] SUPPORT.MD: Correct the amount of physical memory supported for Arm
Hi Julien,
> On 27 Apr 2022, at 14:22, Julien Grall <julien@xxxxxxx> wrote:
>
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> As part of XSA-385, SUPPORT.MD gained a statement regarding the amount
> of physical memory supported.
>
> However, booting Xen on a Arm platform with that amount of memory would
> result to a breakage because the frametable area is too small.
>
> The wiki [1] (as of April 2022) claims we were able to support up to
> 5 TiB on Arm64 and 16 GiB. However, this is not the case because
> the struct page_info has always been bigger than expected (56 bytes
> for 64-bit and 32-bytes for 32-bit).
>
> I don't have any HW with such amount of memory. So rather than
> modifying the code, take the opportunity to use the limit that should
> work on Arm (2 TiB for 64-bit and 12 GiB for 32-bit).
Sadly I have no hardware either even remotely near this capacity and
I think those limits are right for now so...
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx> #arm part
Cheers
Bertrand
> ---
> SUPPORT.md | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/SUPPORT.md b/SUPPORT.md
> index 088dda9561c1..1e3c69a07615 100644
> --- a/SUPPORT.md
> +++ b/SUPPORT.md
> @@ -50,9 +50,10 @@ For the Cortex A57 r0p0 - r1p1, see Errata 832075.
>
> ### Physical Memory
>
> - Status: Supported up to 8 TiB
> -
> -Hosts with more memory are supported, but not security supported.
> + Status, x86: Supported up to 8 TiB. Hosts with more memory are
> + supported but not security support.
> + Status, Arm32: Supported up to 12 GiB
> + Status, Arm64: Supported up to 2 TiB
>
> ### Physical Memory Hotplug
>
> --
> 2.32.0
>
|
