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

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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: 97f9ac3db6 ("crypto: ccp - Add support for SEV-ES to the PSP driver")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tom Lendacky 2023-01-23 16:53:08 -06:00 • committed by Herbert Xu
commit 46a334a98f
1 changed files with 5 additions and 1 deletions
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6
drivers/crypto/ccp/sev-dev.c
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@ -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");