Re: [PATCH v4 1/6] hw/xen: Set XenBackendInstance in the XenDevice before realizing it

[David Woodhouse <dwmw2@xxxxxxxxxxxxx>]

On Sat, 2023-12-02 at 01:41 +0000, Volodymyr Babchuk wrote:
> From: David Woodhouse <dwmw@xxxxxxxxxxxx>
> 
> This allows a XenDevice implementation to know whether it was created
> by QEMU, or merely discovered in XenStore after the toolstack created
> it. This will allow us to create frontend/backend nodes only when we
> should, rather than unconditionally attempting to overwrite them from
> a driver domain which doesn't have privileges to do so.
> 
> As an added benefit, it also means we no longer have to call the
> xen_backend_set_device() function from the device models immediately
> after calling qdev_realize_and_unref(). Even though we could make
> the argument that it's safe to do so, and the pointer to the unreffed
> device *will* actually still be valid, it still made my skin itch to
> look at it.
> 
> Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
> Reviewed-by: Paul Durrant <paul@xxxxxxx>

I still have this lying around in my working tree. Shall I forget all
about it and let you take it with this patch series?

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