linux-kernel - Re: [PATCH v2] xen: Add support for XenServer 6.1 platform device

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Message-ID: <03c90be4-7546-42cf-be5d-3fd6bcf20849@suse.com>
Date: Thu, 27 Feb 2025 16:29:50 +0100
From: Jürgen Groß <jgross@...e.com>
To: Frediano Ziglio <frediano.ziglio@...ud.com>,
 xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
 linux-pci@...r.kernel.org
Cc: Stefano Stabellini <sstabellini@...nel.org>,
 Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v2] xen: Add support for XenServer 6.1 platform device

On 27.02.25 15:50, Frediano Ziglio wrote:
> On XenServer on Windows machine a platform device with ID 2 instead of
> 1 is used.
> 
> This device is mainly identical to device 1 but due to some Windows
> update behaviour it was decided to use a device with a different ID.
> 
> This causes compatibility issues with Linux which expects, if Xen
> is detected, to find a Xen platform device (5853:0001) otherwise code
> will crash due to some missing initialization (specifically grant
> tables). Specifically from dmesg
> 
>      RIP: 0010:gnttab_expand+0x29/0x210
>      Code: 90 0f 1f 44 00 00 55 31 d2 48 89 e5 41 57 41 56 41 55 41 89 fd
>            41 54 53 48 83 ec 10 48 8b 05 7e 9a 49 02 44 8b 35 a7 9a 49 02
>            <8b> 48 04 8d 44 39 ff f7 f1 45 8d 24 06 89 c3 e8 43 fe ff ff
>            44 39
>      RSP: 0000:ffffba34c01fbc88 EFLAGS: 00010086
>      ...
> 
> The device 2 is presented by Xapi adding device specification to
> Qemu command line.
> 
> Signed-off-by: Frediano Ziglio <frediano.ziglio@...ud.com>

Acked-by: Juergen Gross <jgross@...e.com>


Juergen

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