| Message ID | 9d112c35bf613a42453e05c69ec0c96a32ba6078.1674514388.git.thomas.lendacky@amd.com |
|---|---|
| State | Accepted |
| Commit | 46a334a98f585ef78d51d8f5736596887bdd7f54 |
| Headers | show |
| Series | crypto: ccp - Flush the SEV-ES TMR memory before giving it to firmware | expand |
On Mon, Jan 23, 2023 at 04:53:08PM -0600, Tom Lendacky wrote: > 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> > --- > drivers/crypto/ccp/sev-dev.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) Patch applied. Thanks.
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 06fc7156c04f..04059b705db4 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" @@ -1327,7 +1328,10 @@ 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");
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> --- drivers/crypto/ccp/sev-dev.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)