Re: [PATCH v5 2/4] qemu: Add PCI-Express root to ARM virt machine

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 Hi!

> The only negative impact it would have is that
> if someone has old QEMU installed at define time and later upgrades to
> a QEMU with PCI support before starting the guest, they'll lack the
> PCI controller.

 This won't actually happen, because together with the missing controller he/she will not have PCI devices. Attempt to add a device without a bus immediately produces "No PCI bus" report, and the XML gets rejected. And, right after the upgrade, as soon as he/she adds some PCI devices to use, the XML will be re-parsed, and PCI bus description will be added. Because reparsing happens after any change.

> So from that POV, maybe we should just clean up the current merged
> patch so that it is properly exercised in the test suite by providing
> capabilities

 I will try to do it soon.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia



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