On Tue, 2023-02-14 at 17:00 +0800, Binbin Wu wrote: > According to the code of set_cr4_guest_host_mask, > vcpu->arch.cr4_guest_owned_bits is a subset of > KVM_POSSIBLE_CR4_GUEST_BITS, > and X86_CR4_LAM_SUP is not included in KVM_POSSIBLE_CR4_GUEST_BITS. > No matter change CR4_RESERVED_BITS or not, X86_CR4_LAM_SUP will > always be set in CR4_GUEST_HOST_MASK. > > set_cr4_guest_host_mask(): vcpu->arch.cr4_guest_owned_bits = KVM_POSSIBLE_CR4_GUEST_BITS & ~vcpu->arch.cr4_guest_rsvd_bits; kvm_vcpu_after_set_cpuid(): vcpu->arch.cr4_guest_rsvd_bits = __cr4_reserved_bits(guest_cpuid_has, vcpu);