> On 17. May 2021, at 11:43, Christian Zigotzky <chzigotzky@xxxxxxxxxxx> wrote: > > On 17 May 2021 at 09:42am, Nicholas Piggin wrote: >> Excerpts from Christian Zigotzky's message of May 15, 2021 11:46 pm: >>> On 15 May 2021 at 12:08pm Christophe Leroy wrote: >>>> >>>>> Le 15/05/2021 à 11:48, Christian Zigotzky a écrit : >>>>>> Hi All, >>>>>> >>>>>> I bisected today [1] and the bisecting itself was OK but the >>>>>> reverting of the bad commit doesn't solve the issue. Do you have an >>>>>> idea which commit could be resposible for this issue? Maybe the >>>>>> bisecting wasn't successful. I will look in the kernel git log. Maybe >>>>>> there is a commit that affected KVM HV on FSL P50x0 machines. >>>>> If the uImage doesn't load, it may be because of the size of uImage. >>>>> >>>>> See https://github.com/linuxppc/issues/issues/208 >>>>> >>>>> Is there a significant size difference with and without KVM HV ? >>>>> >>>>> Maybe you can try to remove another option to reduce the size of the >>>>> uImage. >>> I tried it but it doesn't solve the issue. The uImage works without KVM >>> HV in a virtual e5500 QEMU machine. >> Any more progress with this? I would say that bisect might have just >> been a bit unstable and maybe by chance some things did not crash so >> it's pointing to the wrong patch. >> >> Upstream merge of powerpc-5.13-1 was good and powerpc-5.13-2 was bad? >> >> Between that looks like some KVM MMU rework. You could try the patch >> before this one b1c5356e873c ("KVM: PPC: Convert to the gfn-based MMU >> notifier callbacks"). That won't revert cleanly so just try run the >> tree at that point. If it works, test the patch and see if it fails. >> >> Thanks, >> Nick > Hi Nick, > > Thanks a lot for your answer. Yes, there is a little bit of progress. The RC2 of kernel 5.13 successfully boots with -smp 3 in a virtual e5500 QEMU machine. > -smp 4 doesn't work anymore since the PowerPC updates 5.13-2. I used -smp 4 before 5.13 because my FSL P5040 machine has 4 cores. > > Could you please post a patch for reverting the commit before b1c5356e873c ("KVM: PPC: Convert to the gfn-based MMU notifier callbacks")? > > Thanks in advance, > > Christian > > For me it is ok to work with -smp 1, 2, and 3 but I am curious why -smp 4 doesn’t work. -Christian
