RE: [PATCH v2 00/25] Enable FRED with KVM VMX

[Li, Xin3]

> This patch set enables the Intel flexible return and event delivery
> (FRED) architecture with KVM VMX to allow guests to utilize FRED.
> 

<snip>

> 
> Intel VMX architecture is extended to run FRED guests, and the major changes
> are:
> 
> 1) New VMCS fields for FRED context management, which includes two new
> event data VMCS fields, eight new guest FRED context VMCS fields and eight new
> host FRED context VMCS fields.
> 
> 2) VMX nested-exception support for proper virtualization of stack levels
> introduced with FRED architecture.
> 

<snip>

> 
> Patch 1-2 are cleanups to VMX basic and misc MSRs, which were sent out earlier
> as a preparation for FRED changes:
> https://lore.kernel.org/kvm/20240206182032.1596-1-xin3.li@xxxxxxxxx/T/#u

Obviously I will drop the 2 clean patches in the next iteration.

> Patch 3-15 add FRED support to VMX.
> Patch 16-21 add FRED support to nested VMX.
> Patch 22 exposes FRED and its baseline features to KVM guests.
> Patch 23-25 add FRED selftests.

Please help to review and comment on the FRED KVM/VMX patches.

Thanks!
    Xin