linux-kernel - Re: [PATCH 1/2 v8] resource: add the new I/O resource descriptor 'IORES_DESC

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Date:   Fri, 30 Nov 2018 12:44:34 +0800
From:   lijiang <lijiang@...hat.com>
To:     Dave Young <dyoung@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        x86@...nel.org, linux-ia64@...r.kernel.org,
        linux-efi@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, akpm@...ux-foundation.org,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        ard.biesheuvel@...aro.org, tony.luck@...el.com,
        fenghua.yu@...el.com, bhe@...hat.com
Subject: Re: [PATCH 1/2 v8] resource: add the new I/O resource descriptor
 'IORES_DESC_RESERVED'

在 2018年11月30日 11:41, Dave Young 写道:
> On 11/29/18 at 04:09pm, Lianbo Jiang wrote:
>> When doing kexec_file_load, the first kernel needs to pass the e820
>> reserved ranges to the second kernel. But kernel can not exactly
>> match the e820 reserved ranges when walking through the iomem resources
>> with the descriptor 'IORES_DESC_NONE', because several e820 types(
>> e.g. E820_TYPE_RESERVED_KERN/E820_TYPE_RAM/E820_TYPE_UNUSABLE/E820
>> _TYPE_RESERVED) are converted to the descriptor 'IORES_DESC_NONE'. It
>> may pass these four types to the kdump kernel, that is not desired result.
>>
>> So, this patch adds a new I/O resource descriptor 'IORES_DESC_RESERVED'
>> for the iomem resources search interfaces. It is helpful to exactly
>> match the reserved resource ranges when walking through iomem resources.
>>
>> In addition, since the new descriptor 'IORES_DESC_RESERVED' is introduced,
>> these code originally related to the descriptor 'IORES_DESC_NONE' need to
>> be updated. Otherwise, it will be easily confused and also cause some
>> errors. Because the 'E820_TYPE_RESERVED' type is converted to the new
>> descriptor 'IORES_DESC_RESERVED' instead of 'IORES_DESC_NONE', it has been
>> changed.
>>
>> Suggested-by: Dave Young <dyoung@...hat.com>
> 
> This was suggested by Boris instead :) 
> 

Sorry for this, i forgot to change it.
And i will correct this in next version.

Thanks.

>> Signed-off-by: Lianbo Jiang <lijiang@...hat.com>
>> ---
>>  arch/ia64/kernel/efi.c |  4 ++++
>>  arch/x86/kernel/e820.c |  2 +-
>>  arch/x86/mm/ioremap.c  | 13 ++++++++++++-
>>  include/linux/ioport.h |  1 +
>>  kernel/resource.c      |  6 +++---
>>  5 files changed, 21 insertions(+), 5 deletions(-)
>>
>>
> [snip]
> 
> Thanks
> Dave
>