Re: [PATCH 7/7] KVM: SVM: Enable save/restore of FRED MSRs

[Sean Christopherson]

On Thu, Aug 13, 2026, Nikunj A. Dadhania wrote:
> On 8/13/2026 4:57 AM, Sean Christopherson wrote:
> > On Mon, Aug 10, 2026, Shivansh Dhiman wrote:
> >> Would you prefer it handled in svm_recalc_fred_msr_intercepts() instead
> >> while setting intercepts? Or is there a better way to deal with this?
> > 
> > Take a hard dependency on an upcoming APM update that states the control area
> > is valid after shutdown, and rework KVM to not clobber control fields on shutdown
> > interception.
> 
> AMD APM 3.45 [1] is now publicly available and has the updated wording:
> 
>     "After an intercepted shutdown, the VMCB control area is valid (with
>      the exception of offsets 60h, 61h, and 68h) and the VMCB state save
>      area is undefined."

Very tangential side topic: are combined versions (all five volumes in one PDF)
of the APM available?  	Having to open five different PDFs to find information
is a pain in the rear, especially since I can never remember what's in which
volume.  I can manually splice the PDFs together, but that's far from ideal.