[PATCH v3 4/5] KVM: nVMX: generate MSR_IA32_CR{0,4}_FIXED1 from guest CPUID

MSR_IA32_CR{0,4}_FIXED1 define which bits in CR0 and CR4 are allowed to be 1 during VMX operation. Since the set of allowed-1 bits is the same in and out of VMX operation, we can generate these MSRs entirely from the guest's CPUID. This lets userspace avoiding having to save/restore these MSRs.

[PATCH v3 4/5] KVM: nVMX: generate MSR_IA32_CR{0,4}_FIXED1 from guest CPUID

MSR_IA32_CR{0,4}_FIXED1 define which bits in CR0 and CR4 are allowed to be 1 during VMX operation. Since the set of allowed-1 bits is the same in and out of VMX operation, we can generate these MSRs entirely from the guest's CPUID. This lets userspace avoiding having to save/restore these MSRs.