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From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: Bin Meng <bmeng.cn@gmail.com>,
	"qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>,
	David Hildenbrand <david@redhat.com>,
	"Richard W.M. Jones" <rjones@redhat.com>
Cc: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>,
	qemu-arm <qemu-arm@nongnu.org>,
	Alistair Francis <Alistair.Francis@wdc.com>,
	Peter Maydell <peter.maydell@linaro.org>
Subject: Re: xilinx-zynq-a9: cannot set up guest memory 'zynq.ext_ram'
Date: Fri, 20 Aug 2021 16:09:56 +0200	[thread overview]
Message-ID: <869f8be9-b76f-e315-9591-9c452bedf922@redhat.com> (raw)
In-Reply-To: <CAEUhbmUhKFFxSspve+t2BeppCGPegpb_Z5g-w8M5t-JMLy3Zsg@mail.gmail.com>

Hi Bin,

On 8/20/21 4:04 PM, Bin Meng wrote:
> Hi,
> 
> The following command used to work on QEMU 4.2.0, but is now broken
> with QEMU head.
> 
> $ qemu-system-arm -M xilinx-zynq-a9 -display none -m 40000000
> -nographic -serial /dev/null -serial mon:stdio -monitor null -device
> loader,file=u-boot-dtb.bin,addr=0x4000000,cpu-num=0
> qemu-system-arm: cannot set up guest memory 'zynq.ext_ram': Cannot
> allocate memory
> 
> Any ideas?

Richard hit that recently too.

Can you provide:

cat /proc/sys/vm/overcommit_kbytes
cat /proc/sys/vm/overcommit_memory
cat /proc/sys/vm/overcommit_ratio

and

cat /proc/meminfo

(CommitLimit, Committed_AS)

and OOM messages.

Per David, 'you can trick QEMU in trying to work around
that issue, specifying a memory-backend-ram with "reserve=off"
as guest RAM.'



  reply	other threads:[~2021-08-20 14:12 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 14:04 xilinx-zynq-a9: cannot set up guest memory 'zynq.ext_ram' Bin Meng
2021-08-20 14:09 ` Philippe Mathieu-Daudé [this message]
2021-08-20 14:22   ` Bin Meng
2021-08-20 14:34     ` David Hildenbrand
2021-08-20 14:39       ` Peter Maydell
2021-08-20 15:31         ` Philippe Mathieu-Daudé
2021-08-20 15:44         ` Igor Mammedov
2021-08-20 15:47           ` David Hildenbrand
2021-08-20 15:53             ` Philippe Mathieu-Daudé
2021-08-20 16:08               ` Igor Mammedov
2021-08-20 16:13                 ` Philippe Mathieu-Daudé
2021-08-20 16:03             ` Igor Mammedov
2021-08-20 16:06               ` Philippe Mathieu-Daudé
2021-08-20 16:36                 ` Igor Mammedov

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