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From: Andrii Anisov <andrii.anisov@gmail.com>
To: Julien Grall <Julien.Grall@arm.com>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Cc: Matthew Daley <mattd@bugfuzz.com>,
	"sstabellini@kernel.org" <sstabellini@kernel.org>
Subject: Re: [PATCH for-4.12 v2 2/2] xen/arm: Stop relocating Xen
Date: Fri, 14 Dec 2018 19:24:21 +0200	[thread overview]
Message-ID: <aa624e20-5daa-afa9-1578-cbd7ca225972@gmail.com> (raw)
In-Reply-To: <d0e0d122-b389-8fa0-df24-80cb1fe926c7@arm.com>



On 14.12.18 18:26, Julien Grall wrote:
> I don't understand how you came up with the conclusion that 128MB will be
> removed from Dom0. We only have the requirement that the first bank is at least
> 128MB. So can you expand it?
IIRC Linux kernel requires that the machine RAM start must be 128MB aligned.
Look at `allocate_memory_11()`, `min_low_order` variable usage. It affects all low memory 1:1 allocation and makes all low memory banks 128MB aligned both start and end.
So that having a module in a low memory poisons the whole 128MB region.

-- 
Sincerely,
Andrii Anisov.

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  reply	other threads:[~2018-12-14 17:24 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-14 11:44 [PATCH for-4.12 v2 0/2] xen/arm: mm: Boot fixes Julien Grall
2018-12-14 11:44 ` [PATCH for-4.12 v2 1/2] xen/arm: mm: Use pte_xen_addr when creating xen entries Julien Grall
2018-12-14 21:44   ` Stefano Stabellini
2018-12-14 11:44 ` [PATCH for-4.12 v2 2/2] xen/arm: Stop relocating Xen Julien Grall
2018-12-14 15:52   ` Andrii Anisov
2018-12-14 16:09     ` Andrii Anisov
2018-12-14 16:26     ` Julien Grall
2018-12-14 17:24       ` Andrii Anisov [this message]
2018-12-14 17:48         ` Julien Grall
2018-12-17 11:11           ` Julien Grall
2018-12-17 16:02             ` Andrii Anisov
2018-12-17 16:56               ` Julien Grall
2018-12-17 17:57             ` Stefano Stabellini
2018-12-17 18:03               ` Julien Grall
2018-12-17 13:14           ` Andrii Anisov
2018-12-17 13:38             ` Julien Grall
2018-12-17 15:55               ` Andrii Anisov
2018-12-17 17:02                 ` Julien Grall
2018-12-17 17:34                   ` Andrii Anisov
2018-12-18 12:09                     ` Andrii Anisov
2018-12-18 13:13                       ` Julien Grall
2018-12-14 17:46       ` Andrii Anisov
2018-12-14 18:04         ` Julien Grall
2018-12-17 15:54           ` Andrii Anisov
2018-12-17 17:03             ` Julien Grall
2018-12-14 16:13   ` Andrii Anisov

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