This looks like a souped-up version of AMD's X86_FEATURE_V_SPEC_CTRL. >From https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/branch-history-injection.html: When “virtualize IA32_SPEC_CTRL” VM-execution control is enabled, the processor supports virtualizing MSR writes and reads to IA32_SPEC_CTRL. This VM-execution control is enabled when the tertiary processor-based VM-execution control bit 7 is set and the tertiary controls are enabled. The support for this VM-execution control is enumerated by bit 7 of the IA32_VMX_PROCBASED_CTLS3 MSR (0x492). Is anyone working on kvm support for this yet? (Intel?)
