On Wed, Jun 11, 2014 at 02:18:21PM +0530, Mahesh J Salgaonkar wrote: > From: Mahesh Salgaonkar <mah...@linux.vnet.ibm.com> > > Currently we forward MCEs to guest which have been recovered by guest. > And for unhandled errors we do not deliver the MCE to guest. It looks like > with no support of FWNMI in qemu, guest just panics whenever we deliver the > recovered MCEs to guest. Also, the existig code used to return to host for > unhandled errors which was casuing guest to hang with soft lockups inside > guest and makes it difficult to recover guest instance. > > This patch now forwards all fatal MCEs to guest causing guest to crash/panic. > And, for recovered errors we just go back to normal functioning of guest > instead of returning to host.
... having corrupted possibly live values that the guest had in SRR0/1. Ideally the guest should have cleared MSR[RI] before putting values in SRR0/1, so perhaps you could check that and return to the guest without giving it a machine check if MSR[RI] is set. But if MSR[RI] is clear, the guest is unfixably corrupted because the machine check overwrote SRR0/1, and the only thing we can do, in the absence of FWNMI support, is give the guest a machine check interrupt and let it crash. Paul. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
