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SubjectRe: [PATCH 2/5 V6] x86/ioremap: strengthen the logic in early_memremap_pgprot_adjust() to adjust encryption mask
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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@lists.infradead.org).
Thanks.

> Thanks
> Dave
>

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