This patch set enables the Intel flexible return and event delivery (FRED) architecture with KVM VMX to allow guests to utilize FRED.
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Intel VMX architecture is extended to run FRED guests, and the major changes are:
- 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.
- VMX nested-exception support for proper virtualization of stack levels
introduced with FRED architecture.
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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@intel.com/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