From 46a334a98f585ef78d51d8f5736596887bdd7f54 Mon Sep 17 00:00:00 2001 From: Tom Lendacky Date: Mon, 23 Jan 2023 16:53:08 -0600 Subject: 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 Signed-off-by: Herbert Xu --- drivers/crypto/ccp/sev-dev.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/crypto/ccp') 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 #include +#include #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"); -- cgit v1.2.3-70-g09d2