On Tue, Sep 11, 2012 at 04:45:18PM +0100, Richard W.M. Jones wrote:
> On emulated PC-like architectures ...
>
> virt-install downloads the kernel and initrd. It knows where to
> download them relative to the URL you give it via a set of hard-coded
> rules. libvirt invokes KVM with the -kernel and -initrd options.
>
> KVM then presents these files through a simple virtual hardware
> interface called fwcfg (firmware config). (fwcfg isn't really
> documented, but someone did "reverse engineer" it from the sources the
> other day -- unfortunately I cannot find that link right now).
>
> The BIOS (SeaBIOS) knows how to query the fwcfg interface and load the
> files and the kernel command line at a predefined memory location. It
> jumps to the kernel which finds the location of initrd (and the
> command line?) via the multiboot spec.
>
> It all works in different ways on other architectures.
Thanks Richard for this thorough explanation.
Marwan
_______________________________________________
virt-tools-list mailing list
[email protected]
https://www.redhat.com/mailman/listinfo/virt-tools-list
