在 2018年09月05日 14:46, Dave Young 写道: > [snip] >> >> As previously mentioned, there are also many differences between kexec and kdump. In general, >> kexec needs to look at all of available physical memory, but kdump doesn't need. >> >> For kexec, kexec-tools will read /sys/firmware/memmap and recreate the e820 ranges for the 2nd >> kernel. If it fails, will use /proc/iomem. >> >> For kdump, kexec-tools will read /proc/iomem and recreate the e820 ranges for kdump kernel. >> BTW: we can not get the range of persistent memory from /proc/iomem. So e820 ranges don't contain >> the persistent memory in kdump kernel, this is the real reason why i need to strengthen the logic >> of adjusting memory encryption mask. > > "persistent memory" is different, I think you meant about some reserved > memory instead > >> >> If kexec-tools also use /sys/firmware/memmap for kdump(like kexec), kdump kernel can also work >> without a fix, but the kexec-tools will have to be modified. Are you sure that you want me to >> fix kexec-tools instead of kernel? > > Yes, please fix kexec-tools to pass reserved ranges in e820, you will > not need this patch then. > This might be a kexec-tools bug, i have posted a patch for kexec-tools(please check kexec@xxxxxxxxxxxxxxxxxxx). Thanks. > Thanks > Dave >
