diff options
| author | Tom Lendacky <thomas.lendacky@amd.com> | 2023-01-23 16:53:08 -0600 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2023-02-03 12:54:54 +0800 |
| commit | 46a334a98f585ef78d51d8f5736596887bdd7f54 (patch) | |
| tree | e2ad29fc38b189e5b18cde8cc2a3749bcb41397a /drivers/crypto/ccp | |
| parent | 7ce515e636ec1807723c30fd3a6181b4ccac6ec6 (diff) | |
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: 97f9ac3db661 ("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>
Diffstat (limited to 'drivers/crypto/ccp')
| -rw-r--r-- | drivers/crypto/ccp/sev-dev.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 13f1c88810d8..e2f25926eb51 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -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"); |