Re: [PATCH v2 3/6] xen: xenstore: add possibility to preserve owner

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 22 Nov 2023, Paul Durrant wrote:
> On 21/11/2023 22:10, Volodymyr Babchuk wrote:
> > Add option to preserve owner when creating an entry in Xen Store. This
> > may be needed in cases when Qemu is working as device model in a
> 
> *may* be needed?
> 
> I don't undertstand why this patch is necessary and the commit comment isn't
> really helping me.
> 
> > domain that is Domain-0, e.g. in driver domain.

I think Volodymyr meant: 

domain that is *not* Domain-0

So I am guessing this patch is needed otherwise QEMU will run into
permissions errors doing xenstore operations



> > "owner" parameter for qemu_xen_xs_create() function can have special
> > value XS_PRESERVE_OWNER, which will make specific implementation to
> > get original owner of an entry and pass it back to
> > set_permissions() call.
> > 
> > Please note, that XenStore inherits permissions, so even if entry is
> > newly created by, it already has the owner set to match owner of entry
> > at previous level.
> > 
> > Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
>