FYI, UP works fine, but a 32-bit SMP host crashes with latest trunk:
BUG: at arch/i386/kernel/smp.c:177 send_IPI_mask_bitmask()
[<c0104d6b>] show_trace_log_lvl+0x19/0x2e
[<c0104e64>] show_trace+0x12/0x14
[<c0104e7a>] dump_stack+0x14/0x16
[<c0111ca7>] send_IPI_mask_bitmask+0x55/0xb0
[<c0101a1d>] send_IPI_mask+0x8/0xa
[<c0111ada>] smp_call_function_single+0x100/0x14d
[<c0368218>] vcpu_clear+0x33/0x49
[<c0368cf2>] vmx_vcpu_load+0x39/0xd2
[<c0361982>] kvm_dev_ioctl+0x181/0x10be
[<c0170fd9>] do_ioctl+0x21/0x66
[<c0171273>] vfs_ioctl+0x255/0x268
[<c01712ce>] sys_ioctl+0x48/0x62
[<c0103ee4>] syscall_call+0x7/0xb
=======================
i suspect vcpu->cpu might be something uninitialized, like -1?
Ingo
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