On 2024-09-05 16:53:55+0000, Jason A. Donenfeld wrote: > On Thu, Sep 05, 2024 at 07:25:05AM +0200, Thomas Weißschuh wrote: > > On 2024-09-05 06:04:12+0000, Jason A. Donenfeld wrote: > > > On Thu, Sep 5, 2024 at 5:45 AM maobibo <maob...@loongson.cn> wrote: > > > > > > > > Jason, > > > > > > > > With the latest qemu 9.1 version, elf format booting is supported. > > > > > > Thanks, I just figured this out too, about 4 minutes ago. Excellent. > > > And the 1G minimum ram limit is gone too. > > > > > > Now working on how to trigger resets. > > > > With "reset" do you mean normal (non-panic) system shutdown/poweroff? > > Since QEMU 9.1 and a recent kernel you can use the pvpanic device for > > that in a cross-architecture way. > > What I mean is that I need for userspace calling `reboot(RB_AUTOBOOT);` > to actually result in QEMU being told to reboot the system. Sounds like > that's not possible (yet?) in 9.1?
With reboot(RB_POWER_OFF) this is indeed the exact usecase for pvpanic shutdown support. Reboot is not supported, but maybe -action shutdown=reboot works and is enough. It would also be trivial to extend pvpanic for reboot support. Use -device pvpanic-pci for QEMU and CONFIG_PVPANIC_PCI=y for Linux. (That should work for most architectures)
