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Re: Failure of hot plugging secondary virtio_blk into q35 Windows 2019

From: Ani Sinha
Subject: Re: Failure of hot plugging secondary virtio_blk into q35 Windows 2019
Date: Tue, 9 Nov 2021 12:41:39 +0530 (IST)
User-agent: Alpine 2.22 (DEB 394 2020-01-19)


On Mon, 8 Nov 2021, Annie.li wrote:

> Update:
> I've tested q35 guest w/o OVMF, the APCI PCI hot-plugging works well in q35
> guest. Seems this issue only happens in q35 guest w/ OVMF.
> Looks that there is already a bug filed against this hotplug issue in q35
> guest w/ OVMF,
> https://bugzilla.redhat.com/show_bug.cgi?id=2004829
> In this bug, it is recommended to add "-global
> ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off \" on qemu command for 6.1.
> However, with this option for 6.1(PCIe native hotplug), there still are kinds
> of issues. For example, one of them is the deleted virtio_blk device still
> shows in the Device Manager in Windows q35 guest, the operation of re-scanning
> new hardware takes forever there. This means both PCIe native hotplug and ACPI
> hotplug all have issues in q35 guests.

This is sad.

> Per comments in this bug, changes in both OVMF and QEMU are necessary to
> support ACPI hot plug in q35 guest. The fixes may likely be available in QEMU
> 6.2.0.

So we are in soft code freeze for 6.2:

I am curious about Gerd's comment #10:
"The 6.2 rebase should make hotplug work
again with the default configuration."

Sadly I have not seen any public discussion on what we want to do
for the issues with acpi hotplug for bridges in q35.

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