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

[Sean Christopherson]

On Fri, Aug 14, 2026, Nikunj A. Dadhania wrote:
> 
> 
> On 8/14/2026 5:17 AM, Sean Christopherson wrote:
> > 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.
> 
> Yes, combined version (Vol 1-5) is available here:
> 
>   https://docs.amd.com/v/u/en-US/40332_4.10_APM_Vol1-5

Awesome, thanks!