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Re: [Qemu-devel] [PATCH 0/6] accel/tcg: Support execution from MMIO and

From: Cédric Le Goater
Subject: Re: [Qemu-devel] [PATCH 0/6] accel/tcg: Support execution from MMIO and small MMU regions
Date: Mon, 23 Jul 2018 17:51:41 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 07/23/2018 05:17 PM, Peter Maydell wrote:
> On 23 July 2018 at 15:57, Cédric Le Goater <address@hidden> wrote:
>> On 07/10/2018 06:00 PM, Peter Maydell wrote:
>>> Note for the Xilinx folks: this patchset makes the mmio-exec
>>> testcase for running from the SPI flash pass. Cedric: you might
>>> like to test the aspeed image you had that relies on execution
>>> from an MMIO region too.
>> I have added a memory region alias at 0x0 on the memory region where
>> the first flash device is mapped and all aspeed machines, palmetto,
>> romulus, witherspoon booted fine.
>> More or less 4MB of data access is generated and the slowdown is hardly
>> noticeable, around one second on a laptop.
>> I wonder if I should add a bool option to the machine to activate
>> or not the feature ?
> I would tend to go with "not" -- if we need the feature then
> it's better to run slowly but correctly, and if we don't need
> the feature then it doesn't cost us any speed I think.

I have chosen a brutal activation (for the moment) :


I will send when your patchset is committed.

Images used for tests are here : 






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