diff options
| author | Tom Lendacky <thomas.lendacky@amd.com> | 2023-01-24 01:53:08 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-10 11:32:58 +0300 |
| commit | daeef81825bfd83c6724998eae324ddb04eca281 (patch) | |
| tree | d0e47b6abf9b8de87e9f82beaaf2ce6856de6322 /drivers/crypto/ccp | |
| parent | d0105ef2f05e22dddacfd675e359cdd350a667c3 (diff) | |
| download | linux-daeef81825bfd83c6724998eae324ddb04eca281.tar.xz | |
crypto: ccp - Flush the SEV-ES TMR memory before giving it to firmware
[ Upstream commit 46a334a98f585ef78d51d8f5736596887bdd7f54 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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 56998bc579d6..3e583f032487 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" @@ -1334,7 +1335,10 @@ 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"); |