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Re: [Xen-devel] sidecar (hvm shim) creation script

On 1/10/18 10:36 AM, George Dunlap wrote:
> On 01/10/2018 04:25 PM, Ian Jackson wrote:
>> Draft README.
>> My git branch is bere
>>    xenbits.xen.org:/home/iwj/ext/xen.git#wip.sidecar
>> (This contains the converter script too.  The git history is not very
>> useful and the files are in the wrong place, but I needed somewhere to
>> do my work.)
>> Ian.
>>                 PV-in-HVM shim with "sidecar" ISO
>>                 =================================
>> Summary
>> -------
>> This README describes a mitigation strategy for Meltdown.
>> The basic principle is to run PV guests (which can read all of host
>> memory due to the hardware bugs) as HVM guests (which cannot, at least
>> not due to Meltdown).  The PV environment is still provided to the
>> guest by an embedded copy of Xen, the "shim".
>> Properties of this approach
>> ---------------------------
> What about "Who should use this approach"?
> You might consider this approach if:
> - You want to deploy a fix immediately
> - You can't, or would like to avoid, updating to Xen 4.8 or newer
> - You can:
>  - Run a script to modify each domain config
>  - Afford an extra 80MiB per guest
>  - Tolerate having an extra QEMU around
> - You don't need migration, memory ballooning, vcpu hotplug, or guest
> console

Didn't Ian get guest console working in v2 of his script? Didn't Anthony
get memory ballooning working in v3 of Vixen?

Doug Goldstein

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