Re: [PATCH 0/2 RESEND v7] add reserved e820 ranges to the kdump kernel e820 table
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- To: Dave Hansen <dave.hansen@xxxxxxxxx>
- Subject: Re: [PATCH 0/2 RESEND v7] add reserved e820 ranges to the kdump kernel e820 table
- From: Borislav Petkov <bp@xxxxxxxxx>
- Date: Mon, 26 Nov 2018 19:04:55 +0100
- Cc: Lianbo Jiang <lijiang@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, kexec@xxxxxxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, luto@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, ard.biesheuvel@xxxxxxxxxx, tony.luck@xxxxxxxxx, fenghua.yu@xxxxxxxxx, dyoung@xxxxxxxxxx, bhe@xxxxxxxxxx
- In-reply-to: <d457ed46-d983-20b2-ad7f-9eaa6d98f2bf@intel.com>
- References: <20181124051223.19994-1-lijiang@redhat.com> <d457ed46-d983-20b2-ad7f-9eaa6d98f2bf@intel.com>
- User-agent: Mutt/1.10.1 (2018-07-13)
On Mon, Nov 26, 2018 at 09:44:46AM -0800, Dave Hansen wrote:
> On 11/23/18 9:12 PM, Lianbo Jiang wrote:
> > These patches add the new I/O resource descriptor 'IORES_DESC_RESERVED'
> > for the iomem resources search interfaces, and in order to make it still
> > work after the new descriptor is added, these codes originally related
> > to 'IORES_DESC_NONE' have been updated.
>
> I'm having a really hard time figuring out what problem these patches solve.
>
> What end-user visible behavior does this set change?
Yeah, that was a long process of digging out the "why".
I'd recommend reading the previous threads and, more specifically:
https://lkml.kernel.org/r/CABhMZUUscS3jUZUSM5Y6EYJK6weo7Mjj5-EAKGvbw0qEe%2B38zw@xxxxxxxxxxxxxx
in short: we need to export e820 reserved ranges to the second kernel so
that it can talk to PCI devices properly. (And I'm wondering how it did
work until now...)
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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