diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 7c9149492970..70174a9118b1 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -24,6 +24,7 @@
 #include <linux/cpufeature.h>
 
 #include <asm/smp.h>
+#include <asm/cacheflush.h>
 
 #include "psp-dev.h"
 #include "sev-dev.h"
@@ -1114,7 +1115,10 @@ void sev_pci_init(void)
 
 	/* Obtain the TMR memory area for SEV-ES use */
 	sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE);
-	if (!sev_es_tmr)
+	if (sev_es_tmr)
+		/* Must flush the cache before giving it to the firmware */
+		clflush_cache_range(sev_es_tmr, SEV_ES_TMR_SIZE);
+	else
 		dev_warn(sev->dev,
 			 "SEV: TMR allocation failed, SEV-ES support unavailable\n");