KVM_PFN_ERR_HWPOISON
if (pfn == KVM_PFN_ERR_HWPOISON) {
if (hfn == KVM_PFN_ERR_HWPOISON) {
if (fault->pfn == KVM_PFN_ERR_HWPOISON) {
return KVM_PFN_ERR_HWPOISON;