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Re: [PATCH v2 2/6] xen: backends: touch some XenStore nodes only if device...
- To: "paul@xxxxxxx" <paul@xxxxxxx>
- From: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Date: Wed, 22 Nov 2023 22:50:59 +0000
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- Cc: "qemu-devel@xxxxxxxxxx" <qemu-devel@xxxxxxxxxx>, David Woodhouse <dwmw@xxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>, Anthony Perard <anthony.perard@xxxxxxxxxx>, Kevin Wolf <kwolf@xxxxxxxxxx>, Hanna Reitz <hreitz@xxxxxxxxxx>, Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Jason Wang <jasowang@xxxxxxxxxx>, "open list:X86 Xen CPUs" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "open list:Block layer core" <qemu-block@xxxxxxxxxx>
- Delivery-date: Wed, 22 Nov 2023 22:51:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v2 2/6] xen: backends: touch some XenStore nodes only if device...
Hi Paul,
Paul Durrant <xadimgnik@xxxxxxxxx> writes:
> On 21/11/2023 22:10, Volodymyr Babchuk wrote:
>> was created by QEMU
>> Xen PV devices in QEMU can be created in two ways: either by QEMU
>> itself, if they were passed via command line, or by Xen toolstack. In
>> the latter case, QEMU scans XenStore entries and configures devices
>> accordingly.
>> In the second case we don't want QEMU to write/delete front-end
>> entries for two reasons: it might have no access to those entries if
>> it is running in un-privileged domain and it is just incorrect to
>> overwrite entries already provided by Xen toolstack, because toolstack
>> manages those nodes. For example, it might read backend- or frontend-
>> state to be sure that they are both disconnected and it is safe to
>> destroy a domain.
>> This patch checks presence of xendev->backend to check if Xen PV
>> device is acting as a backend (i.e. it was configured by Xen
>
> Technally *all* XenDevice objects are backends.
>
Yes, you are right of course. I'll rephrase this paragraph in the next
version.
--
WBR, Volodymyr
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