Commit 46a334a9 authored by Tom Lendacky's avatar Tom Lendacky Committed by Herbert Xu
Browse files

crypto: ccp - Flush the SEV-ES TMR memory before giving it to firmware 



Perform a cache flush on the SEV-ES TMR memory after allocation to prevent
any possibility of the firmware encountering an error should dirty cache
lines be present. Use clflush_cache_range() to flush the SEV-ES TMR memory.

Fixes: 97f9ac3d ("crypto: ccp - Add support for SEV-ES to the PSP driver")
Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 7ce515e6

drivers/crypto/ccp/sev-dev.c

+5 −1
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/fs_struct.h>



#include <asm/smp.h>

#include <asm/cacheflush.h>



#include "psp-dev.h"

#include "sev-dev.h"
@@ -1335,7 +1336,10 @@ 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");