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Re: [Qemu-devel] Why is SeaBIOS used with -kernel?

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Why is SeaBIOS used with -kernel?
Date: Fri, 1 Apr 2016 10:47:21 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 01/04/2016 10:44, Richard W.M. Jones wrote:
> On Fri, Apr 01, 2016 at 10:24:37AM +0200, Paolo Bonzini wrote:
>> On 01/04/2016 10:14, Richard W.M. Jones wrote:
>>> Found it: only CONFIG_MPTABLE=y was necessary.  It boots with:
>>> # CONFIG_PIRTABLE is not set
>>> # CONFIG_SMBIOS is not set
>>> # CONFIG_ACPI is not set
>> If you add all three it should not give any slowdown and will provide
>> full hardware features to the kernel.  qboot does ACPI and PCI bus
>> assignment (it doesn't do SMBIOS because I got bored debugging it. :))
> Enabling all 4 adds about 2ms.
> However the overhead of SeaBIOS is still down from 68ms to 18ms
> (4.0% of total boot time down to 1.1%) so it's still a big gain.
> I wonder how we can make use of this in qemu and downstream distros?
> Can we have a bios-min.bin which is used with -kernel boots?

That's an interesting idea.  We can look at it for 2.7.


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