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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 30/01/2015 21:24, Boris Ostrovsky wrote:
> On 01/30/2015 03:37 PM, Andrew Cooper wrote:
>
>>
>> The actions Xen needs to take are:
>>
>> - Copy the buffer into Xen.
>> - Scan the buffer for the correct patch
>
>
> Why not have the toolstack search for the right patch? Hypervisor will
> verify that it's appropriate but won't have to spend time scanning the
> (potentially large) buffer.
>
> (The logic for scanning the buffer is in the hypervisor code but we
> could move it to a library)

a) Xen already needs to scan for the boot time patching and b) because
the interface already has this property.

One could certainly prepare the patch in userspace and that would be
more efficient (patches welcome if you are feeling particularly keen),
but I am not going to loose sleep over it.  It is likely that the
majority of users will delay a microcode update until a maintenance
window and plan time for a reboot.

~Andrew

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