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From: Andrii Anisov <andrii.anisov@gmail.com>
To: Julien Grall <julien.grall@arm.com>, xen-devel@lists.xen.org
Cc: Matthew Daley <mattd@bugfuzz.com>, sstabellini@kernel.org
Subject: Re: [PATCH for-4.12 v2 2/2] xen/arm: Stop relocating Xen
Date: Fri, 14 Dec 2018 18:09:58 +0200	[thread overview]
Message-ID: <1ec4f8e1-7c33-71b8-7a35-25b6b8657f57@gmail.com> (raw)
In-Reply-To: <90f45fb8-3ff7-492e-3773-c8d3bd2906bc@gmail.com>



On 14.12.18 17:52, Andrii Anisov wrote:
> Hello Julien,
> 
> Let me speculate a bit about the topic.
> 
> On 14.12.18 13:44, Julien Grall wrote:
>> At the moment, Xen is relocated towards the end of the memory.
> This statement is not really true. Some time ago, XEN was relocated toward the end of
> the low memory (under 4 GB). Currently, on my board I see some kind of mess:
> 
>      (XEN) RAM: 0000000048000000 - 00000000bfffffff
>      (XEN) RAM: 0000000500000000 - 000000057fffffff
>      (XEN) RAM: 0000000600000000 - 000000067fffffff
>      (XEN) RAM: 0000000700000000 - 000000077fffffff
>      (XEN)
>      (XEN) MODULE[0]: 0000000048000000 - 0000000048013000 Device Tree
>      (XEN) MODULE[1]: 000000007a000000 - 000000007c000000 Kernel
>      (XEN) MODULE[2]: 000000007c000000 - 000000007c010000 XSM
>      (XEN)  RESVD[0]: 0000000048000000 - 0000000048013000
>      (XEN)
>      (XEN)
>      (XEN) Command line: dom0_mem=3G console=dtuart dtuart=serial0 dom0_max_vcpus=2 bootscrub=0 loglvl=all cpufreq=none tbuf_size=8192 loglvl=all/none guest_loglvl=all/none
>      (XEN) parameter "cpufreq" unknown!
>      (XEN) Placing Xen at 0x000000077fe00000-0x0000000780000000
>      (XEN) Update BOOTMOD_XEN from 0000000078080000-0000000078188d81 => 000000077fe00000-000000077ff08d81
> 
> As you can see XEN is moved towards the end of the first GB of the low memory instead of the end of under 4GB RAM.

Sorry, I have to recall the piece above. I miscounted zeros in the relocation address. XEN is actually set by the end of the RAM above 4GB.


> On my current setup I have two 128MB chunks stolen: one by relocated XEN, kernel module an XSM module, 
Not by relocated XEN, but still by kernel and XSM

-- 
Sincerely,
Andrii Anisov.

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  reply	other threads:[~2018-12-14 16:09 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 [this message]
2018-12-14 16:26     ` Julien Grall
2018-12-14 17:24       ` Andrii Anisov
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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