This is great Pedro! Thanks for the pointers, other KVM users might find it useful.
Regarding the Linux Kernel question, there is no preferred version from our side. You can even build a vanilla arm64 kernel and it should just work. IIRC we provided support until 5.8 in gem5 v21.0 Kind Regards Giacomo > -----Original Message----- > From: Pedro Becker via gem5-users <gem5-users@gem5.org> > Sent: 01 September 2021 11:24 > To: gem5-users@gem5.org > Cc: Pedro Becker <pe...@ac.upc.edu> > Subject: [gem5-users] Re: Boot FS with kvm and multiple cores > > Hi all, > > First of all, thank you Giacomo for the support, I finally got KVM + arm + > multiple cores working! Kernel 4.14 worked, btw. > > Just a list of things I had to do, in case someone else ends up in the same > situation I did. > > For the MSR (immediate) undefined instruction, the solution goes as > Giacomo pointed out: re-build the arm kernel and unselect the UAO from it. > After cloning the gem5 arm kernel repo and `make gem5_defconfig` one can > make menuconfig -> kernel features -> ARM v8.2 architectural features -> > unselect the UAO option. build the kernel and use it. > > After I still got the following problem when restoring from a kvm taken > checkpoint: > > [ 5.681321] INFO: rcu_preempt self-detected stall on CPU > [ 5.681326] 0-...: (1 ticks this GP) idle=646/140000000000001/0 > softirq=330/330 fqs=0 > [ 5.681330] (t=549009 jiffies g=-144 c=-145 q=14) > [ 5.681336] rcu_preempt kthread starved for 549009 jiffies! > g18446744073709551472 c18446744073709551471 f0x0 RCU_GP_WAIT_FQS(3) > ->state=0x402 ->cpu=0 > [ 5.681342] rcu_preempt I 0 8 2 0x00000020 > ... > > But this problem vanished when I used the simulated gic (my host cpu is > ARMv8, and does not have gic2 supported by gem5). For that, one can > combine the `--cpu-type kvm` flag with the `--kvm-userspace-gic` > (fs_bigLITTLE.py, gem5 version 21.1.0.0) when creating checkpoints. > > Regards, > Pedro. > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an > email to gem5-users- > le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. _______________________________________________ gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an email to gem5-users-le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
