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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Thu, 22 Sep 2016 21:37:16 +1000
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Subject: Re: [Qemu-devel] pseries-2.6 migration from QEMU-2.6 to QEMU-2.7
 broken
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To: =?ISO-8859-1?Q?C=E9dric?= Le Goater <clg@kaod.org>, Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>, bharata@linux.vnet.ibm.com, aik@ozlabs.ru
Cc: qemu-devel@nongnu.org, qemu-ppc@nongnu.org, david@gibson.dropbear.id.au

On Thu, 2016-09-22 at 13:27 +0200, C=C3=A9dric Le Goater wrote:

> > TCG migration succeeds and proceeds ahead. But fails somewhere
> > ahead in
> > powerpc exception handler:
> >=20
> > [qemu]$ ./ppc64-softmmu/qemu-system-ppc64=C2=A0=C2=A0-machine pseries=
-
> > 2.6,usb=3Doff -vga none -nographic -m 2G=C2=A0=C2=A0=C2=A0../../imgs/=
guest.disk
> > -monitor pty --incoming tcp:localhost:4444=C2=A0
> > char device redirected to /dev/pts/5 (label compat_monitor0)
> > ppc_kvm_enabled: is kvm enabled 0
> > get_insns_equal:=C2=A0
> > Did not match, ignore 9223477658187168481 !=3D 9223477658187151905
> > ppc_kvm_enabled: is kvm enabled 0
> > get_insns_equal:=C2=A0
> > Did not match, ignore 331702 !=3D 69558
> > Cannot open font file True
> > Cannot open font file True
> > qemu: fatal: Trying to deliver HV exception 4 with no HV support
>=20
> hmm, this is because we added MSR_HVB in msr_mask AFAICT. we should
> have=C2=A0a similar vmstate op for it I think

We also need to be careful about now allowing KVM migration to/from
wildly different CPU generations, or is that handled elsewhere ? (PVR
match ?)

> C.=C2=A0
>=20
> >=20
> >=20
> > NIP c0000000000795c8=C2=A0=C2=A0=C2=A0LR d00000000074407c CTR c000000=
000079544 XER
> > 0000000000000000 CPU#0
> > MSR 8000000000009032 HID0 0000000000000000=C2=A0=C2=A0HF 800000000000=
0030
> > iidx 1 didx 1
> > TB 00000007 32202510341 DECR 00596259
> >=20
> > Regards,
> > Nikunj
> >=20