[pve-devel] Updated qemu pkg needed for Meltdown and Spectre?

[Waschbüsch IT-Services GmbH]

> Am 05.01.2018 um 21:41 schrieb Fabian Grünbichler <f.gruenbichler at proxmox.com>:
> 
> On Fri, Jan 05, 2018 at 06:50:33PM +0100, Waschbüsch IT-Services GmbH wrote:
>> 
>> AFAIK Meltdown is only affecting Intel (& ARM), but not AMD - see 'Forcing direct cache loads' here:
>> 
>> https://lwn.net/SubscriberLink/742702/83606d2d267c0193/ <https://lwn.net/SubscriberLink/742702/83606d2d267c0193/> <https://lwn.net/SubscriberLink/742702/83606d2d267c0193/ <https://lwn.net/SubscriberLink/742702/83606d2d267c0193/>>
>> 
>> Does anyone know if the current patching efforts will differentiate between Intel and AMD x86-64 offerings?
>> 
>> I would hate to update kernels with these patches unless my systems are indeed affected.
>> Not because of possible performance impacts, mind, but because of stability.
>> I just feel it in my bones this major intervention is going to introduce regressions... :-(
> 
> the Meltdown fix (KPTI) is disabled on AMD by default (and also
> possible to disable using a kernel parameter on all platforms).
> 
> the (planned) Spectre fixes (Retpoline, IBRS and IBPB) are for all/most
> platforms and vendors, some of them will likely be exposed as kernel
> parameters, but some of them will likely only available as compile time
> options or not tunable at all.

Thanks! That is very good to know.