Re: [Xen-devel] [RFC v2] misc/xenmicrocode: Upload /lib/firmware/<some blob> to the hypervisor

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 12/06/15 03:30, Luis R. Rodriguez wrote:
> On Fri, Jan 30, 2015 at 1:57 PM, Luis R. Rodriguez <mcgrof@xxxxxxxx> wrote:
>> On Fri, Jan 30, 2015 at 08:37:33PM +0000, Andrew Cooper wrote:
>>> The right thing to do is to fix the hypercall implementation, at which
>>> point the utility below is fine and xc_microcode_update() can be a thing
>>> wrapper around the hypercall.
>>>
>>> The actions Xen needs to take are:
>>>
>>> - Copy the buffer into Xen.
>>> - Scan the buffer for the correct patch
>>> - Rendezvous all online cpus in an IPI to apply the patch, and keep the
>>> processors in until all have completed the patch.
>>>
>>> The IPI itself probably wants common rendezvous code, and a system
>>> specific call for application.  The system specific call will need to
>>> adhere to the requirements in the relevant manual.  Care will have to be
>>> taken to avoid deadlocking with the time calibration rendezvous, and
>>> facilities such as the watchdog might temporally need pausing.
>>>
>>> If you feel up to all that, then please go ahead.  If not, I will
>>> attempt to find some copious free time.
>> You can have a crack at that. Let me know when the above is ready and I'll
>> respin. I'd try it but it seems you would spend considerbly less time than
>> me doing the above.
> Andrew, wanted to check to see if you have had time to work on the above.

Sadly no - I have not had time.

~Andrew

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