Hi, On Thu, Jul 28, 2011 at 6:52 PM, Jan Kiszka <jan.kiszka@xxxxxxxxxxx> wrote: > On 2011-07-27 18:35, Vasilis Liaskovitis wrote: >> Hi, >> >> On Mon, Jul 25, 2011 at 3:18 PM, Jan Kiszka <jan.kiszka@xxxxxxxxxxx> wrote: >> Applying these 3 patches + hacks/fix on master doesn't solve the >> initial "CPU: not responding" dmesg hotplug issue on my setup. >> The ACPI event is delivered correctly, but "echo 1 > >> /sys/devices/system/cpu/cpuX/online" still fails. >> e.g. tested with "-smp 1,maxcpus=2" >> >> Could you share your qemu-kvm command line? > > Nothing special: > > qemu-system-x86_64 /my/image -m 1G -snapshot -smp 2,maxcpus=3 \ > -cpu host,-kvmclock > ok, I have tested the patched qemu-kvm (guestOS ubuntu 10.10 with 2.6.35-24-generic kernel) with: qemu-system-x86_64 /my/image -m 1G -smp 1,maxcpus=2 \ -cpu host,-kvmclock on 2 different physical hosts. On the first one: vendor_id : GenuineIntel cpu family : 6 model : 37 model name : Intel(R) Core(TM) i3 CPU M 370 @ 2.40GHz cpu hotplug works ok. When onlining (echo 1 > /sys/devices/system/cpu/cpu1/online) dmesg shows: Booting Node 0 Processor 1 APIC 0x1 TSC synchronization [CPU#0 -> CPU#1]: Measured 3573498937792 cycles TSC warp between CPUs, turning off TSC clock. Marking TSC unstable due to check_tsc_sync_source failed kvm-clock: cpu 1, msr 0:1f15901, secondary cpu clock on the second system: vendor_id : AuthenticAMD cpu family : 16 model : 4 model name : AMD Phenom(tm) II X4 955 Processor onlining fails: Booting Node 0 Processor 1 APIC 0x1 CPU1: Not Responding. When I specify -kvmclock on the qemu command line for the AMD system, it seems that the clocksource on the guest is hpet. Dmesg on guest shows "Switching to clocksource hpet" and /sys/devices/system/clocksource/clocksource0/current_clocksource confirms. When I don't specify -kvmclock, then the guest clocksource is actually kvm-clock. But the onlining problem persists. I have also tried a newer guestOS (debian-testing with 2.6.39 or 3.0.0 kernel) on the second system, same problem. Also: what physical host have you used for testing? thanks, - Vasilis -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html