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[Qemu-devel] i386/kvm: QEMU crash when doing 'info cpus' after CPU hotpl
From: |
Greg Kurz |
Subject: |
[Qemu-devel] i386/kvm: QEMU crash when doing 'info cpus' after CPU hotplug |
Date: |
Mon, 9 Oct 2017 19:19:15 +0200 |
Hi x86 folks,
While trying to reproduce on x86 an issue we're currently hitting on ppc,
I got this:
$ ./x86_64-softmmu/qemu-system-x86_64 -snapshot -no-shutdown -nographic
-machine q35,accel=kvm -smp 1,maxcpus=2 -serial mon:stdio -drive
file=$HOME/images/fedora26-x86_64.qcow2,if=virtio
QEMU 2.10.50 monitor - type 'help' for more information
(qemu) device_add host-x86_64-cpu,socket-id=1,core-id=0,thread-id=0,id=foo
(qemu) info cpus
error: failed to get MSR 0x38d
qemu-system-x86_64: /home/greg/Work/qemu/qemu-devel/target/i386/kvm.c:2121:
kvm_get_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.
Aborted (core dumped)
Same happens with a pc machine.
But it doesn't happen if I use cpu-add instead of device_add:
(qemu) cpu-add 1
(qemu) [ 8.335221] CPU1 has been hot-added
(qemu) info cpus
* CPU #0: pc=0xffffffffb08986e6 (halted) thread_id=23964
CPU #1: pc=0x00000000fffffff0 thread_id=24001
This is with the QEMU master branch SHA1 530049bc1dcc24c.
Cheers,
--
Greg
- [Qemu-devel] i386/kvm: QEMU crash when doing 'info cpus' after CPU hotplug,
Greg Kurz <=