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Re: Booting uncompressed kernel images

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On Thu, 2016-02-04 at 15:40 -0200, Tiago Ilieve wrote:
> Sorry for the delay in my response. In the past couple days I was
> confirming with Oracle if my findings (using virt-what, as you
> suggested) where right and, indeed, they are supporting Xen HVM right
> now.

Great!

> 
> So, there's no need for an uncompressed/gzipped kernel anymore and the
> default one boots just fine. Although I'm still curious regarding the
> possibility of booting an uncompressed kernel on
> native/full-virtualization, I guess this does not makes sense.

WRT virtualisation, not in general no.

If possible you really want to do the decompression in guest context, to
avoid issues with potentially malicious compressed binaries.

For native there generally isn't much point, but for x86 at least there is
also a bunch of necessary setup and gathering of information (e.g. from the
BIOS in 16 bit mode) which is done in the same preamble as where the
decompressor runs (more or less) and which you would need to replicate
before booting the uncompressed image's entry point -- it's really not
worth the effort in general.

> I'm really thankful for you support and inclination to help us on the
> matter.

No problem!

Ian.

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Thread

Booting uncompressed kernel images Tiago Ilieve <tiago.myhro@gmail.com> - 2016-02-01 09:30 +0100
  Re: Booting uncompressed kernel images Ian Campbell <ijc@debian.org> - 2016-02-01 11:10 +0100
    Re: Booting uncompressed kernel images Ian Campbell <ijc@debian.org> - 2016-02-01 11:40 +0100
  Re: Booting uncompressed kernel images Jose R R <Jose.r.r@metztli-it.com> - 2016-02-01 11:40 +0100
    Re: Booting uncompressed kernel images Tiago Ilieve <tiago.myhro@gmail.com> - 2016-02-02 02:50 +0100
      Re: Booting uncompressed kernel images Ian Campbell <ijc@debian.org> - 2016-02-02 12:30 +0100
        Re: Booting uncompressed kernel images Tiago Ilieve <tiago.myhro@gmail.com> - 2016-02-02 18:40 +0100
          Re: Booting uncompressed kernel images Ian Campbell <ijc@debian.org> - 2016-02-02 18:40 +0100
            Re: Booting uncompressed kernel images Tiago Ilieve <tiago.myhro@gmail.com> - 2016-02-04 19:00 +0100
              Re: Booting uncompressed kernel images Ian Campbell <ijc@debian.org> - 2016-02-05 12:10 +0100
                Re: Booting uncompressed kernel images Ben Hutchings <ben@decadent.org.uk> - 2016-02-05 16:10 +0100
                Re: Booting uncompressed kernel images Andreas Ziegler <ml2013@andreas-ziegler.de> - 2016-02-05 16:10 +0100

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