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Re: [PATCH] hvmloader: Update to SMBIOS 2.6
- To: Jan Beulich <jbeulich@xxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 28 Aug 2025 11:01:21 +0100
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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 10:01:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28/08/2025 8:07 am, Jan Beulich wrote:
> 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.
I'm not sure if this has a reasonable Fixes tag.
It's a combination of an ill-specified domain handle format, and using
an ill-specified version of the SMBios spec.
~Andrew
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