KVM_MSR_FILTER_DEFAULT_DENY
#define KVM_MSR_FILTER_VALID_MASK (KVM_MSR_FILTER_DEFAULT_DENY)
default_allow = !(filter->flags & KVM_MSR_FILTER_DEFAULT_DENY);
#define KVM_MSR_FILTER_VALID_MASK (KVM_MSR_FILTER_DEFAULT_DENY)
.flags = KVM_MSR_FILTER_DEFAULT_DENY,