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.
