I think what you want to do is in the kick() functions in MmioVirtIO and PciVirtIO, you want to declare a ScopedMigration at the start of the function, and pass its constructor the result of the eventQueue() method. The SimObject class inherits from EventManager and knows what event queue it's supposed to use, and that's what eventQueue returns. When you declare a ScopedMigration, it will handle the locking correctly and move over to that queue, and when it goes out of scope (at the end of the function) it will put everything back.
Please give that a try, and if it works for you (I don't have a way to test it myself) put up a review so we can get a fix checked in. Gabe On Mon, Mar 15, 2021 at 5:28 PM Liyichao <[email protected]> wrote: > Thanks for your explaination.In O3 type with multi-core 9P is ok. > > > > > ------------------------------ > > 李翼超 charlie > Mobile：+86-15858232899 > Email：[email protected] > > > *发件人： *Gabe Black<[email protected]> > *收件人： *gem5 users mailing list<[email protected]> > *抄送： *Liyichao<[email protected]> > *主题： *Re: [gem5-users] gem5 crash when mount by vio-9p protocol in KVM > mode with more than 1 core > *时间： *2021-03-16 07:24:15 > > I haven't looked at the code yet, but this is probably because the v9 > implementation is getting asynchronous input which might be received by one > thread, which then tries to schedule an event on an event queue associated > with another queue. Most of the time this is not an issue since gem5 is > usually single threaded, but when using multiple cores with KVM, each core > runs in its own thread. There's a way to add events to the event queue in > another thread safely (ScopedMigration) which I'm assuming the v9 code is > not using. > > Gabe > > On Sun, Mar 7, 2021 at 8:38 PM Liyichao via gem5-users < > [email protected]> wrote: > >> Hi All: >> >> >> >> When I use –vio-9p with fs_bigLITTLE.py, 1 core the mount cmd >> was ok, but more than 1 core, mount cmd will cause GEM5 crash >> >> >> >> 1core: >> >> Gem5 cmd: ./build/ARM/gem5.opt --debug-flags=Exec -d >> /home/l00515693/m5out configs/example/arm/fs_bigLITTLE.py --cpu-type=kvm >> --kernel=vmlinux --machine-type=VExpress_GEM5_V1 >> --disk=expanded-aarch64-ubuntu-trusty-headless.img --caches >> --big-cpu-clock=2.6GHz --little-cpu-clock=2.6GHz --big-cpus=1 >> --little-cpus=0 --mem-size=4GB --param 'system.realview.gic.gem5_extensions >> = True' --bootscript=./test.rcS --vio-9p >> >> Mount cmd in guest OS: mount -t 9p -o >> trans=virtio,version=9p2000.L,aname=/home/l00515693/m5out/9p/share gem5 >> /mnt/9p >> >> root@charlie:~# df -h >> >> Filesystem Size Used Avail Use% Mounted on >> >> /dev/root 9.9G 3.3G 6.2G 35% / >> >> devtmpfs 2.0G 4.0K 2.0G 1% /dev >> >> none 4.0K 0 4.0K 0% /sys/fs/cgroup >> >> none 396M 52K 396M 1% /run >> >> none 5.0M 0 5.0M 0% /run/lock >> >> none 2.0G 0 2.0G 0% /run/shm >> >> none 100M 0 100M 0% /run/user >> >> gem5 2.9T 1.8T 989G 65% /mnt/9p >> >> >> >> >> >> >> >> 2core: >> >> Gem5 cmd: ./build/ARM/gem5.opt --debug-flags=Exec -d >> /home/l00515693/m5out configs/example/arm/fs_bigLITTLE.py --cpu-type=kvm >> --kernel=vmlinux --machine-type=VExpress_GEM5_V1 >> --disk=expanded-aarch64-ubuntu-trusty-headless.img --caches >> --big-cpu-clock=2.6GHz --little-cpu-clock=2.6GHz --big-cpus=2 >> --little-cpus=0 --mem-size=4GB --param 'system.realview.gic.gem5_extensions >> = True' --bootscript=./test.rcS --vio-9p >> >> >> >> Mount cmd in guest OS: mount -t 9p -o >> trans=virtio,version=9p2000.L,aname=/home/l00515693/m5out/9p/share gem5 >> /mnt/9p >> >> >> >> GEM5 crash info: >> >> gem5.opt: build/ARM/sim/eventq_impl.hh:40: void >> EventQueue::schedule(Event*, Tick, bool): Assertion `when >= getCurTick()' >> failed. >> >> Program aborted at tick 476281849910020 >> >> --- BEGIN LIBC BACKTRACE --- >> >> ./build/ARM/gem5.opt(_Z15print_backtracev+0x40)[0xaaaadd24e418] >> >> ./build/ARM/gem5.opt(_Z12abortHandleri+0x5c)[0xaaaadd25efa4] >> >> linux-vdso.so.1(__kernel_rt_sigreturn+0x0)[0xffff9fea5688] >> >> /lib/aarch64-linux-gnu/libc.so.6(raise+0xb0)[0xffff9f6634f8] >> >> --- END LIBC BACKTRACE --- >> >> Aborted (core dumped) >> >> >> _______________________________________________ >> gem5-users mailing list -- [email protected] >> To unsubscribe send an email to [email protected] >> %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s > >
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