Re: [PATCH v2 06/25] KVM: VMX: Defer enabling FRED MSRs save/load until after set CPUID

On Wed, Feb 07, 2024 at 09:26:26AM -0800, Xin Li wrote:

Clear FRED VM entry/exit controls when initializing a vCPU, and set these controls only if FRED is enumerated after set CPUID.

FRED VM entry/exit controls need to be set to establish context sufficient to support FRED event delivery immediately after VM entry and exit. However it is not required to save/load FRED MSRs for a non-FRED guest, which aren't supposed to access FRED MSRs.

Signed-off-by: Xin Li xin3.li@intel.com Tested-by: Shan Kang shan.kang@intel.com

Reviewed-by: Chao Gao chao.gao@intel.com