Re: [Xen-devel] 2.6.37 PV on HVM issues

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 3 Dec 2010, Alex Bligh wrote:
> --On 3 December 2010 11:24:43 +0000 Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
> wrote:
> 
> > On Fri, 2010-12-03 at 11:18 +0000, Stefano Stabellini wrote:
> >>
> >> If you know what you are doing you can manually remove the check for
> >> the unplug protocol in the kernel, just hack
> >> arch/x86/xen/platform-pci-unplug.c:check_platform_magic.
> >
> > This is exactly equivalent to adding "xen_emul_unplug=unnecessary" to
> > the kernel command line, isn't it?
> >
> > Conversely if you want to always force emulated devices (i.e. disable
> > any attempt to unplug) then "xen_emul_unplug=never" will do what you
> > want.
> 
> OK, I am confused. What I want do is is bring the PV devices up as
> /dev/xvda not /dev/sda. I don't much care whether or not it attempts to
> unplug the emulated devices, as I can cope with or without the additional
> presence of the emulated devices.
> 

This is what it should happen on a vanilla upstream kernel if you pass
xen_emul_unplug=unnecessary to the kernel command line options.
Blkfront should never create devices other than xvd.


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