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Re: xen 4.15.5: msr_relaxed required for MSR 0x1a2


  • To: James Dingwall <james-xen@xxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 16 Nov 2023 16:32:47 +0000
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  • Delivery-date: Thu, 16 Nov 2023 16:33:04 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 16/11/2023 4:15 pm, James Dingwall wrote:
> Hi,
>
> Per the msr_relaxed documentation:
>
>    "If using this option is necessary to fix an issue, please report a bug."
>
> After recently upgrading an environment from Xen 4.14.5 to Xen 4.15.5 we
> started experiencing a BSOD at boot with one of our Windows guests.  We found
> that enabling `msr_relaxed = 1` in the guest configuration has resolved the
> problem.  With a debug build of Xen and `hvm_debug=2048` on the command line
> the following messages were caught as the BSOD happened:
>
> (XEN) [HVM:11.0] <vmx_msr_read_intercept> ecx=0x1a2
> (XEN) vmx.c:3298:d11v0 RDMSR 0x000001a2 unimplemented
> (XEN) d11v0 VIRIDIAN CRASH: 1e ffffffffc0000096 fffff80b8de81eb5 0 0
>
> I found that MSR 0x1a2 is MSR_TEMPERATURE_TARGET and from that this patch
> series from last month:
>
> https://patchwork.kernel.org/project/xen-devel/list/?series=796550
>
> Picking out just a small part of that fixes the problem for us. Although the
> the patch is against 4.15.5 I think it would be relevant to more recent
> releases too.

Which version of Windows, and what hardware?

The Viridian Crash isn't about the RDMSR itself - it's presumably
collateral damage shortly thereafter.

Does filling in 0 for that MSR also resolve the issue?  It's model
specific and we absolutely cannot pass it through from real hardware
like that.

Thanks,

~Andrew



 


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