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Re: [PATCH] hvmloader: Update to SMBIOS 2.6
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 28 Aug 2025 09:07:33 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 28 Aug 2025 07:07:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.08.2025 19:47, Andrew Cooper wrote:
> On 22/08/2025 2:47 pm, Teddy Astie wrote:
>> Currently, hvmloader uses SMBIOS 2.4, however, when using OVMF, the
>> SMBIOS is patched to 2.8, which has clarified the UUID format (as GUID).
>>
>> In Linux, if the SMBIOS version is >= 2.6, the GUID format is used, else
>> (undefined as per SMBIOS spec), big endian is used (used by Xen). Therefore,
>> you have a endian mismatch causing the UUIDs to mismatch in the guest.
>>
>> $ cat /sys/hypervisor/uuid
>> e865e63f-3d30-4f0b-83e0-8fdfc1e30eb7
>> $ cat /sys/devices/virtual/dmi/id/product_uuid
>> 3fe665e8-303d-0b4f-83e0-8fdfc1e30eb7
>> $ cat /sys/devices/virtual/dmi/id/product_serial
>> e865e63f-3d30-4f0b-83e0-8fdfc1e30eb7
>>
>> This patch updates the SMBIOS version from 2.4 to 2.6 and fixup the UUID
>> written in the table; which effectively fix this endianness mismatch with
>> OVMF; while the UUID displayed by Linux is still the same for SeaBIOS.
>>
>> Signed-off-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
>> ---
>> This effectively changes the UUID seen with UEFI guests as it was
>> actually inconsistent with SeaBIOS and SMBIOS expectations.
>> ---
>
> I agree this is a real bug and needs fixing.
Hmm, I didn't realize this is a bug, and hence put the patch off as 4.22
material. If there is a bug being fixed: Teddy, please add a Fixes: tag.
Jan
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