On Mon, Dec 18, 2017 at 08:10:37PM +0100, Andrew Jones wrote: > I just tried on TCG now. It doesn't run. It gets > > Timer Frequency 62500000 Hz (Output in timer count) > Unhandled exception ec=0 (UNKNOWN) > Vector: 4 (el1h_sync) > ESR_EL1: 02000000, ec=0 (UNKNOWN) > FAR_EL1: 0000000000000000 (not valid) > Exception frame registers: > pc : [<0000000040080088>] lr : [<00000000400803e8>] pstate: 800003c5 > sp : 00000000400aff90 > x29: 0000000000000000 x28: 0000000000000000 > x27: 0000000040090000 x26: 0000000040090c60 > x25: 0000000040090000 x24: 000000001fffffff > x23: 0000000000000000 x22: 0000000000000000 > x21: 0000000000000040 x20: 0000000000000000 > x19: 0000000000000000 x18: 00000000400b0000 > x17: 0000000000000000 x16: 0000000000000000 > x15: 00000000400afe8c x14: 00000000400b0000 > x13: 00000000400afecc x12: 0000000000001680 > x11: 0000000000000000 x10: 6666666666666667 > x9 : 0000000000000030 x8 : 0000000000000030 > x7 : 00000000400af670 x6 : 00000000400af673 > x5 : 00000000400af678 x4 : 00000000000007b7 > x3 : 00000000400af6ec x2 : 0000000040090000 > x1 : 000000000015909e x0 : 000000004b000000 > I looked into this. It's due to the hvc call. The exception goes away if you add '-machine virtualization=yes' to the qemu command line. But as there's no point in running it, and it's way too slow, then the 'accel = kvm' added in v2 of the patch is the right thing to do. Thanks, drew
