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

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Message-ID: <20181130034129.GA26791@dhcp-128-65.nay.redhat.com>
Date:   Fri, 30 Nov 2018 11:41:29 +0800
From:   Dave Young <dyoung@...hat.com>
To:     Lianbo Jiang <lijiang@...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'

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 :) 

> 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