diff --git a/libc/kernel/uapi/linux/sev-guest.h b/libc/kernel/uapi/linux/sev-guest.h
index a822bed..a722641 100644
--- a/libc/kernel/uapi/linux/sev-guest.h
+++ b/libc/kernel/uapi/linux/sev-guest.h
@@ -51,6 +51,8 @@
 #define SNP_GUEST_FW_ERR_MASK GENMASK_ULL(31, 0)
 #define SNP_GUEST_VMM_ERR_SHIFT 32
 #define SNP_GUEST_VMM_ERR(x) (((u64) x) << SNP_GUEST_VMM_ERR_SHIFT)
+#define SNP_GUEST_FW_ERR(x) ((x) & SNP_GUEST_FW_ERR_MASK)
+#define SNP_GUEST_ERR(vmm_err,fw_err) (SNP_GUEST_VMM_ERR(vmm_err) | SNP_GUEST_FW_ERR(fw_err))
 #define SNP_GUEST_VMM_ERR_INVALID_LEN 1
 #define SNP_GUEST_VMM_ERR_BUSY 2
 #endif