On Sun, Nov 15, 2020 at 04:11:43PM +0100, Thomas Gleixner wrote: > Unfortunately there is no way to tell the APIC "Mask vector X" and the > dump kernel does neither know which device it comes from nor does it > have enumerated PCI completely which would reset the device and shutup > the spew. Due to the interrupt storm it does not get that far. Can't we just set DisINTx, clear MSI Enable and clear MSI-X Enable on all active PCI devices in the crashing kernel before starting the crash kernel? So that the crash kernel starts with a clean slate? Guilherme's original patches from 2018 iterate over all 256 PCI buses. That might impact boot time negatively. The reason he has to do that is because the crashing kernel doesn't know which devices exist and which have interrupts enabled. However the crashing kernel has that information. It should either disable interrupts itself or pass the necessary information to the crashing kernel as setup_data or whatever. Guilherme's patches add a "clearmsi" command line parameter. I guess the idea is that the parameter is always passed to the crash kernel but the patches don't do that, which seems odd. Thanks, Lukas
