On 08/05/19 at 10:09am, Matthew Garrett wrote: > On Mon, Aug 5, 2019 at 1:36 AM Dave Young <dyoung@xxxxxxxxxx> wrote: > > > > kexec reboot fails randomly in UEFI based kvm guest. The firmware > > just reset while calling efi_delete_dummy_variable(); Unfortunately > > I don't know how to debug the firmware, it is also possible a potential > > problem on real hardware as well although nobody reproduced it. > > > > The intention of efi_delete_dummy_variable is to trigger garbage collection > > when entering virtual mode. But SetVirtualAddressMap can only run once > > for each physical reboot, thus kexec_enter_virtual_mode is not necessarily > > a good place to clean dummy object. > > I agree that this isn't necessarily the best place to do this in the > kexec case, but given we control the firmware, figuring out what's > actually breaking seems like a good plan. I'm more than glad to get the root cause, if you can help on debugging I would like to share the efi var file etc. But it is indeed a problem cause weird reset on end user part, but even if we can not find the root cause (in firmware..) I think we still need avoid it with such workaround. Thanks Dave
