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Date: Fri, 13 Jan 2023 10:32:05 +0100
From: "Gerd Hoffmann" <kraxel@redhat.com>
To: devel@edk2.groups.io
Cc: Laszlo Ersek <lersek@redhat.com>, Michael Brown <mcb30@ipxe.org>,
	Ard Biesheuvel <ardb+tianocore@kernel.org>,
	Brijesh Singh <brijesh.singh@amd.com>,
	Erdem Aktas <erdemaktas@google.com>,
	James Bottomley <jejb@linux.ibm.com>,
	Jiewen Yao <jiewen.yao@intel.com>,
	Jordan Justen <jordan.l.justen@intel.com>,
	Min Xu <min.m.xu@intel.com>, Oliver Steffen <osteffen@redhat.com>,
	Sebastien Boeuf <sebastien.boeuf@intel.com>,
	Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: [edk2-devel] [PATCH v2] OvmfPkg/PlatformInitLib: catch QEMU's CPU hotplug reg block regression
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On Fri, Jan 13, 2023 at 07:03:54AM +0100, Gerd Hoffmann wrote:
>   Hi,
> 
> > - QEMU can be configured with other compat properties on the command
> > line so that "CPU hotplug with SMI" and "CPU hot-unplug with SMI" *not*
> > be offered to the firmware. Then QEMU will reject hotplug attempts, and
> > the SMM hotplug code in edk2 will not be triggered by the (virtual)
> > hardware.
> 
> Can we have edk2 print instructions for that in the error message?

This seems to be:

    qemu -M q35 \
        -global ICH9-LPC.x-smi-cpu-hotplug=off \
        -global ICH9-LPC.x-smi-cpu-hotunplug=off

But it appears to not work.

Or did you mean something else?

take care,
  Gerd