** Changed in: qemu
Assignee: (unassigned) => Gustavo Romero (gromero)
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https://bugs.launchpad.net/bugs/1900241
Title:
[regression][powerpc] some vcpus are found offline inside guest with
different vsmt setting from qemu-cmdline and breaks subsequent vcpu
hotplug operation (xive)
Status in QEMU:
New
Bug description:
Env:
Host: Power9 HW ppc64le
# lscpu
Architecture: ppc64le
Byte Order: Little Endian
CPU(s): 128
On-line CPU(s) list: 24-31,40-159
Thread(s) per core: 4
Core(s) per socket: 16
Socket(s): 2
NUMA node(s): 2
Model: 2.3 (pvr 004e 1203)
Model name: POWER9, altivec supported
Frequency boost: enabled
CPU max MHz: 3800.0000
CPU min MHz: 2300.0000
L1d cache: 1 MiB
L1i cache: 1 MiB
L2 cache: 8 MiB
L3 cache: 160 MiB
NUMA node0 CPU(s): 24-31,40-79
NUMA node8 CPU(s): 80-159
Vulnerability Itlb multihit: Not affected
Vulnerability L1tf: Mitigation; RFI Flush, L1D private per thread
Vulnerability Mds: Not affected
Vulnerability Meltdown: Mitigation; RFI Flush, L1D private per thread
Vulnerability Spec store bypass: Mitigation; Kernel entry/exit barrier (eieio)
Vulnerability Spectre v1: Mitigation; __user pointer sanitization,
ori31 speculation barrier enabled
Vulnerability Spectre v2: Mitigation; Software count cache flush
(hardware accelerated), Software link stack flush
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Not affected
Host Kernel: 5.9.0-0.rc8.28.fc34.ppc64le (Fedora rawhide)
Guest Kernel: Fedora33(5.8.6-301.fc33.ppc64le)
Qemu: e12ce85b2c79d83a340953291912875c30b3af06 (qemu/master)
Steps to reproduce:
Boot below kvm guest: (-M pseries,vsmt=2 -smp 8,cores=8,threads=1)
/home/sath/qemu/build/qemu-system-ppc64 -name vm1 -M pseries,vsmt=2
-accel kvm -m 4096 -smp 8,cores=8,threads=1 -nographic -nodefaults
-serial mon:stdio -vga none -nographic -device virtio-scsi-pci -drive
file=/home/sath/tests/data/avocado-vt/images/fdevel-
ppc64le.qcow2,if=none,id=hd0,format=qcow2,cache=none -device scsi-
hd,drive=hd0
lscpu inside guest:
Actual:
[root@atest-guest ~]# lscpu
Architecture: ppc64le
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0,2,4,6
Off-line CPU(s) list: 1,3,5,7 --------------------------NOK
Thread(s) per core: 1
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Model: 2.3 (pvr 004e 1203)
Model name: POWER9 (architected), altivec supported
Hypervisor vendor: KVM
Virtualization type: para
L1d cache: 128 KiB
L1i cache: 128 KiB
NUMA node0 CPU(s): 0,2,4,6
Vulnerability Itlb multihit: Not affected
Vulnerability L1tf: Mitigation; RFI Flush, L1D private per thread
Vulnerability Mds: Not affected
Vulnerability Meltdown: Mitigation; RFI Flush, L1D private per thread
Vulnerability Spec store bypass: Mitigation; Kernel entry/exit barrier (eieio)
Vulnerability Spectre v1: Mitigation; __user pointer sanitization,
ori31
speculation barrier enabled
Vulnerability Spectre v2: Mitigation; Software count cache flush
(hardwar
e accelerated), Software link stack flush
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Not affected
Expected:
[root@atest-guest ~]# lscpu
Architecture: ppc64le
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 1
Core(s) per socket: 8
Socket(s): 1
NUMA node(s): 1
Model: 2.3 (pvr 004e 1203)
Model name: POWER9 (architected), altivec supported
Hypervisor vendor: KVM
Virtualization type: para
L1d cache: 256 KiB
L1i cache: 256 KiB
NUMA node0 CPU(s): 0-7
Vulnerability Itlb multihit: Not affected
Vulnerability L1tf: Mitigation; RFI Flush, L1D private per thread
Vulnerability Mds: Not affected
Vulnerability Meltdown: Mitigation; RFI Flush, L1D private per thread
Vulnerability Spec store bypass: Mitigation; Kernel entry/exit barrier (eieio)
Vulnerability Spectre v1: Mitigation; __user pointer sanitization,
ori31
speculation barrier enabled
Vulnerability Spectre v2: Mitigation; Software count cache flush
(hardwar
e accelerated), Software link stack flush
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Not affected
There by further vcpuhotplug operation fails...
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