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Re: [PATCH for-4.22] x86/fred: Enable FRED by default on AMD systems
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 2 Jun 2026 20:30:05 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- Delivery-date: Tue, 02 Jun 2026 19:30:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02/06/2026 8:21 pm, Oleksii Kurochko wrote:
>
>
> On 6/2/26 6:45 PM, Andrew Cooper wrote:
>> FRED is now believed to be complete for AMD systems, and has had its
>> tyres
>> kicked by both XenServer and AMD. Enable FRED by default on capable AMD
>> systems (Zen6 and later).
>>
>> Support on Intel is still not yet complete. Leave it as tech preview
>> and not
>> security supported.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> ---
>> CC: Jan Beulich <jbeulich@xxxxxxxx>
>> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>> CC: Teddy Astie <teddy.astie@xxxxxxxxxx>
>> CC: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
>
> Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
>
Thanks.
>>
>> The issue on Intel is to do with virtualisation of MSR_SPEC_CTRL for PV
>> guests, and is waiting on the resolution of a question I've asked Intel.
>> ---
>> docs/misc/xen-command-line.pandoc | 6 +++---
>> xen/arch/x86/traps-setup.c | 4 ++--
>> 2 files changed, 5 insertions(+), 5 deletions(-)
>>
>
> Don't we want than add that to CHANGELOG.md that FRED is now enabled
> by default?
I was going to wait until we had sorted Intel before doing that. But
there's no chance of that happening for 4.22 now.
~Andrew
|
