Re: [BUG/RFC] Two cpus are not brought up normally in SLES11 sp3 VM after reboot

[Paolo Bonzini <pbonzini@redhat.com>]

On 06/07/2015 09:54, zhanghailiang wrote:
> 
> From host, we found that QEMU vcpu1 thread and vcpu7 thread were not
> consuming any cpu (Should be in idle state),
> All of VCPUs' stacks in host is like bellow:
> 
> [<ffffffffa07089b5>] kvm_vcpu_block+0x65/0xa0 [kvm]
> [<ffffffffa071c7c1>] __vcpu_run+0xd1/0x260 [kvm]
> [<ffffffffa071d508>] kvm_arch_vcpu_ioctl_run+0x68/0x1a0 [kvm]
> [<ffffffffa0709cee>] kvm_vcpu_ioctl+0x38e/0x580 [kvm]
> [<ffffffff8116be8b>] do_vfs_ioctl+0x8b/0x3b0
> [<ffffffff8116c251>] sys_ioctl+0xa1/0xb0
> [<ffffffff81468092>] system_call_fastpath+0x16/0x1b
> [<00002ab9fe1f99a7>] 0x2ab9fe1f99a7
> [<ffffffffffffffff>] 0xffffffffffffffff
> 
> We looked into the kernel codes that could leading to the above 'Stuck'
> warning,
> and found that the only possible is the emulation of 'cpuid' instruct in
> kvm/qemu has something wrong.
> But since we can’t reproduce this problem, we are not quite sure.
> Is there any possible that the cupid emulation in kvm/qemu has some bug ?

Can you explain the relationship to the cpuid emulation?  What do the
traces say about vcpus 1 and 7?

Paolo