Re: [Xen-devel] Xen 4.3 development update

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

Il 05/03/2013 13:44, George Dunlap ha scritto:
> * xl, compat mode, and older kernels
>   owner: ?
>   Many older 32-bit PV kernels that can run on a 64-bit hypervisor with
>   xend do not work when started with xl.  The following work-around seems to
>   work:
>     xl create -p lightning.cfg
>     xenstore-write /local/domain/$(xl domid
> lightning)/device/vbd/51713/protocol x86_32-abi
>     xl unpause lightning
>   This node is normally written by the guest kernel, but for older kernels
>   seems not to be.  xend must have a work-around; port this work-around to xl.

The workaround uses the native_protocol field of struct xc_dom_arch.

Here is the code in the xend DevController module:

        frontpath = self.frontendPath(devid)
        backpath  = self.backendPath(backdom, devid)

        frontDetails.update({
            'backend' : backpath,
            'backend-id' : "%i" % backdom.getDomid(),
            'state' : str(xenbusState['Initialising'])
            })

        if self.vm.native_protocol:
            frontDetails.update({'protocol' : self.vm.native_protocol})

        backDetails.update({
            'domain' : self.vm.getName(),
            'frontend' : frontpath,
            'frontend-id' : "%i" % self.vm.getDomid(),
            'state' : str(xenbusState['Initialising']),
            'online' : "1"
            })

Paolo

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