Re: [Xen-devel] Xen fails to resume on AMD Fam15h (and Fam17h?) because of CPUID mismatch

["Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>]

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On Tue, Feb 11, 2020 at 12:59:22PM +0000, Claudia wrote:
> February 10, 2020 12:14 PM, "Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com> wrote:
> 
> > On Mon, Feb 10, 2020 at 11:17:34AM +0000, Andrew Cooper wrote:
> > 
> >> On 10/02/2020 08:55, Jan Beulich wrote:
> >> On 10.02.2020 00:06, Marek Marczykowski-Górecki wrote:
> >> Hi,
> >> 
> >> Multiple Qubes users have reported issues with resuming from S3 on AMD
> >> systems (Ryzen 2500U, Ryzen Pro 3700U, maybe more). The error message
> >> is:
> >> 
> >> (XEN) CPU0: cap[ 1] is 7ed8320b (expected f6d8320b)
> >> 
> >> If I read it right, this is:
> >> - OSXSAVE: 0 -> 1
> >> - HYPERVISOR: 1 -> 0
> >> 
> >> Commenting out the panic on a failed recheck_cpu_features() in power.c
> >> makes the system work after resume, reportedly stable. But that doesn't
> >> sounds like a good idea generally.
> >> 
> >> Is this difference a Xen fault (some missing MSR / other register
> >> restore on resume)? Or BIOS vendor / AMD, that could be worked around in
> >> Xen?
> >> The transition of the HYPERVISOR bit is definitely a Xen issue,
> >> with Andrew having sent a patch already (iirc).
> >> 
> >> https://lore.kernel.org/xen-devel/20200127202121.2961-1-andrew.cooper3@citrix.com
> >> 
> >> Code is correct.  Commit message needs rework, including in light of
> >> this discovery.  (I may eventually split it into two patches.)
> > 
> > Claudia, do you want to test with this patch?
> 
> I'm getting hunk failed in domctl.c applying to R4.1 default repo (fc31, Xen 4.13). I'll see if I can fix it but bear with me, I'm new at this.
> 
> Marek: Would you by any chance be willing to merge this into a test branch on your repo, so the rest of us can pull it directly into qubes-builder? It'll take you a fraction of the time it'll take me, plus then zachm and awokd and anyone else can pull it also.

Here is one for Xen 4.13:
https://github.com/QubesOS/qubes-vmm-xen/pull/71
builder.conf snippet for qubes-builder:

    BRANCH_vmm_xen=xen-4.13-amd-suspend
    GIT_URL_vmm_xen=https://github.com/marmarek/qubes-vmm-xen

This is already v2 patch from the other thread.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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