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[Xen-bugs] [Bug 457] vcpu-set doesn't work on x86_64bit

To: xen-bugs@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-bugs] [Bug 457] vcpu-set doesn't work on x86_64bit
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
Date: Tue, 07 Feb 2006 18:30:20 +0000
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grimm@xxxxxxxxxx changed:

           What    |Removed                     |Added
                 CC|                            |grimm@xxxxxxxxxx

------- Additional Comments From grimm@xxxxxxxxxx  2006-02-07 18:30 -------
smp on x86_64 was broken all together but just fixed by changeset 8775.  

vcpu-set still does not work...but does affect things, causing a soft lockup on

Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0     3392     1 r-----    17.5
ubuntu64                           5      128     4 -b----     3.0
root@callahan:~# xm vcpu-set 5 2
root@callahan:~# xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0     3392     1 r-----    17.7
ubuntu64                           5      128     4 r-----     9.9

xm list still reports 4, but /proc/cpuinfo reports 3.  so, the vcpu-set brought
down 1 vcpu but not 2.  subsequent xm vcpu-set commands do nothing.  then, upon

root@callahan:~# /sbin/shutdown -h now

Broadcast message from root (tty1) (Wed Feb  8 00:35:28 2006):

The system is going down for system halt NOW!
BUG: soft lockup detected on CPU#2!
CPU 2:
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.16-rc2-xenU #4
RIP: e030:[<ffffffff8010a0ca>] <ffffffff8010a0ca>{hypercall_page+202}
RSP: e02b:ffff880000447f18  EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffffff80403184 RCX: ffffffff8010a0ca
RDX: ffffffff80408768 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff880000447f40 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00002b4c3b3746d0(0000) GS:ffffffff803cf100(0000) knlGS:0000000000000000
CS:  e033 DS: 002b ES: 002b

Call Trace: <ffffffff8010bf5c>{cpu_idle+161} <ffffffff8024e874>{cpu_bringup+72}
 * Switching to runlevel: 0
 * Sending processes the TERM signal

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