Re: [PATCH 2/9] qemu: process: Don't try to redetect missing qemuCaps on reconnect

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On Mon, Nov 25, 2019 at 01:53:47PM +0100, Peter Krempa wrote:
> The redetection was originally added in 43c01d3838 as a way to recover
> from libvirtd upgrade from the time when we didn't persist the qemu
> capabilities in the status XML. Also this the oldest supported qemu by
> more than two years.
> 
> Even if somebody would have a running VM running at least qemu 1.5 with
> such an old libvirt we certainly wouldn't do the right thing by
> redetecting the capabilities and then trying to communicate with qemu.
> 
> For now it will be the best to just stop considering this scenario any
> more.
> 
> Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
> ---
>  src/qemu/qemu_process.c | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
> index 1b88c471f4..a76a8da841 100644
> --- a/src/qemu/qemu_process.c
> +++ b/src/qemu/qemu_process.c
> @@ -8085,13 +8085,6 @@ qemuProcessReconnect(void *opaque)
>          goto error;
>      }
> 
> -    /* If upgrading from old libvirtd we won't have found any
> -     * caps in the domain status, so re-query them
> -     */
> -    if (!priv->qemuCaps &&
> -        (qemuDomainUpdateQEMUCaps(obj, driver->qemuCapsCache) < 0))
> -        goto error;

Shouldn't we be making missing qemuCaps into a fatal error
when loading that VM.

Regards,
Daniel
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