On 2018-04-06 13:33, Nikhil Devshatwar wrote: > Hi all, > > I am writing a baremetal Jailhouse loader[1] on QEMU platform. > Right now SGIs are not working between CPU cores (possibly some GIC > config missing). >
Means we are talking about bare-metal code running directly in QEMU, no Jailhouse involved at that point, right? > Also, I picked up the psci series from Ralf[2] which has a psci-demo to > send SGIs from inmate. > With the CONFIG_BARE_METAL, I am able to build this as a baremetal > application. > > Even with baremetal psci-demo application, I am facing the same issue > where the SGIs sent from one core do not fire interrupts on the other core. > Ralf confirmed that the same application works on real platforms, but > fails on QEMU. > > Is there anything specific that I need to do to enable SGIs **specially > on QEMU**? > > My QEMU cmdline is https://pastebin.ubuntu.com/p/BrvyCm88dS/ > > Also, as part of my debug, I enabled QEMU traces for GICv3 for Linux > kernel[3] > > Even after reverse engineering[4] the traces and adding the > generated GIC config code[5] in the psci-demo, still no luck in getting > SGIs working. > > I don't know somehow kernel is able to use SGIs but the baremetal app is > not. > Any help on this will be much appreciated. How do the traces of the non-working bare-metal SGI transmission differ from those issued by Linux guests? And then I would use gdb on qemu, stepping through the SGI transmission code to see where it branches differently under bare-metal workload. Usually, this reveals rather quickly why QEMU decides not to deliver some interrupt because of bit X having the wrong value or state Y not being reached. Jan > > [1] > https://gist.github.com/nikhildevshatwar/e17121c1355422a61fddaa52615fc7a9 > [2] https://github.com/lfd/jailhouse/tree/arm-psci > [3] https://pastebin.ubuntu.com/p/jQKsshVJSp/ > [4] https://pastebin.ubuntu.com/p/q7y64645v2/ > [5] https://pastebin.ubuntu.com/p/RMwySvW4bK/ > > Thanks & Regards, > Nikhil Devshatwar -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to jailhouse-dev+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
