[pve-devel] cpuflag: pcid needed in guest for good performance after meltdown

[Stefan Priebe - Profihost AG]

Am 08.01.2018 um 22:11 schrieb Michael Rasmussen:
> On Mon, 8 Jan 2018 21:34:57 +0100
> Stefan Priebe - Profihost AG <s.priebe at profihost.ag> wrote:
> 
>> Hello,
>>
>> for meltdown mitigation and performance it's important to have the pcid
>> flag passed down to the guest (f.e.
>> https://groups.google.com/forum/m/#!topic/mechanical-sympathy/L9mHTbeQLNU).
>>
> As I understand it it is only required given the guest also uses a
> kernel that take advantage of this feature and which is, for Linux,
> a kernel 4.14 post Meltdown fix?

sure but I think this is also backported to LTS kernels - and also SuSE
backported this into all their releases from SLES 11, 12 and OpenSuSE.

> 
> 
> 
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