Re: [Xen-devel] Windows HVM no longer boots with AMD Ryzen 3700X

[Jan Beulich <jbeulich@xxxxxxxx>]

On 20.08.2019 22:36, Andreas Kinzler wrote:
> On 20.08.2019 20:12, Andrew Cooper wrote:
>>> Xen version 4.10.2. dom0 kernel 4.13.16. The BIOS version is unchanged
>>> from 2700X (working) to 3700X (crashing).
>> So you've done a Zen v1 => Zen v2 CPU upgrade and an existing system?
> 
> With "existing system" you mean the Windows installation? Yes, but it is 
> not relevant. The same BSODs happen if you boot the HVM with just the 
> iso installation medium and no disks.
> 
>>> Is it a known problem? Did someone test the new EPYCs?
>> This looks familiar, and is still somewhere on my TODO list.
> 
> Do you already know the reason or is that still to investigate?
> 
>> Does booting with a single vCPU work?
> 
> Number of vCPUs make no difference

Well, according to Steven it does, with viridian=0. Could you
re-check this?

While, according to AMD's processor specs page, the 3700X is just an
8-core chip, I wonder whether
https://lists.xenproject.org/archives/html/xen-devel/2019-09/msg01954.html
still affects this configuration as well. Could you give this a try in
at least the viridian=0 case? As to Linux, did you check that PVH
(or HVM, which you don't mention) guests actually start all their vCPU-s
successfully?

Jan

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