KVM_PFN_ERR_MASK
#define KVM_PFN_ERR_SIGPENDING (KVM_PFN_ERR_MASK + 3)
#define KVM_PFN_ERR_NEEDS_IO (KVM_PFN_ERR_MASK + 4)
return !!(pfn & KVM_PFN_ERR_MASK);
#define KVM_PFN_ERR_FAULT (KVM_PFN_ERR_MASK)
#define KVM_PFN_ERR_HWPOISON (KVM_PFN_ERR_MASK + 1)
#define KVM_PFN_ERR_RO_FAULT (KVM_PFN_ERR_MASK + 2)