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Re: [Xen-devel] [PATCH] x86/vtx: Improvements to ept= command line handling
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 21 Dec 2018 11:33:53 +0000
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- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 21 Dec 2018 11:33:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 21/12/2018 11:27, Jan Beulich wrote:
>>>> On 21.12.18 at 12:15, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 21/12/2018 11:13, Jan Beulich wrote:
>>>>>> On 20.12.18 at 18:16, <andrew.cooper3@xxxxxxxxxx> wrote:
>>>> + By default, Xen will use A/D tracking when available in hardware,
>>>> except
>>>> + on Avoton processors affected by erratum AVR41. Explicitly choosing
>>>> + `ad=0` will disable the use of A/D tracking on capable hardware,
>>>> whereas
>>>> + choosing `ad=1` will cause tracking to be used even on AVR41-affected
>>>> + hardware.
>>> Is there any reason for this special casing of the one erratum?
>>> Earlier this week I've gone through some spec updates for other
>>> purposes, and I've seen some rather frightening EPT A/D errata.
>> Which, out of interest? There are a few, particularly on Skylake, but
>> all the problematic ones I'm aware of are fixed in microcode.
> I'd have to go through them again, as I didn't pay close attention to
> what was said about their status. Are we generally putting ourselves
> on the position then that errata don't need working around if there's
> a microcode update available? That's a possible position to take, but
> not spelled out anywhere.
Intel and AMD are quite clear that you should be running up-to-date
microcode.
Its conceptually similar to someone saying "I found an issue in Xen
4.8.0" and our reply being "Thats great, but its already fixed in 4.8.1
- please update".
~Andrew
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