在 2018年11月18日 19:52, Borislav Petkov 写道: > On Fri, Nov 16, 2018 at 11:25:55AM +0800, lijiang wrote: >> For the pci mmconfig issue, it should be good enough that the e820 reserved region >> [mem 0x0000000078000000-0x000000008fffffff] is only passed to the second kernel, but >> the pci mmconfig region is not the same in another machine. > > Yes. And now the question is, *which* reserved regions need to be mapped > for the second kernel to function properly? How do we figure that out? > >> A simple case, hotplug a pci network card and use the ssh/nfs to dump the vmcore. >> If the pci mmconfig region is not reserved in kdump kernel, the pci hotplug device >> could not be recognized. So the pci network card won't work. > > Yes that's a good example; put *that* example in your commit message. > >> Here, there is an example about SME kdump. Maybe it can help to better understand. > > You keep pasting that and I've read it already. And you keep repeating > that the reserved regions need to be mapped in the second kernel and I'm > asking, how do we determine *which* regions should we pass to the second > kernel? > > If we should pass *all* reserved regions, why? > > IOW, I'm looking for the *why* first. > > Thx. > I guess you have gotten the answer what you want from Dave's reply. Thank you, Boris. Also thanks for Dave's explanation in detail. Regards, Lianbo _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
