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

[Alexandre DERUMIER]

Hi, I have found a nice wiki, updated each day with infos about with new patches for spectre/meltown (kernel , kvm, microcode , ...)

https://github.com/hannob/meltdownspectre-patches

----- Mail original -----
De: "Waschbüsch IT-Services GmbH" <service at waschbuesch.it>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Samedi 6 Janvier 2018 09:24:01
Objet: Re: [pve-devel] Updated qemu pkg needed for Meltdown and Spectre?

> 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. 
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