On Fri, 26 Sept 2025 at 16:59, Peter Maydell <peter.mayd...@linaro.org> wrote:
> I'm trying to repro the setup I had last year, but I can't
> figure out a setup where I can get hot-unplug to work:
> the "device-del" command documented in system/cpu-hotplug.html
> always fails with:
>
> "desc": "acpi: device unplug request for not supported device type:
> IvyBridge-IBRS-x86_64-cpu"
>
> Do you know how to get this working?

Turns out I needed to also add enough command line arguments
to get a guest to boot (which is a bit tricky when you don't
want to use the gui frontend because fontconfig et al are
full of leaks that clutter up the asan output). The error
message from device-del is extremely unhelpful here.

The command line I ended up with was

./build/x86-tgts-asan/qemu-system-x86_64 -vga std -display curses
-no-user-config -m 2048 -nodefaults -machine q35,accel=kvm,usb=off
-smp 1,maxcpus=2 -cpu IvyBridge-IBRS -qmp
unix:/tmp/qmp-sock,server=on,wait=off -cdrom
~/test-images/ubuntu-server-2404/ubuntu-24.04-live-server-amd64.iso

thanks
-- PMM

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