refactor(cpus): optimize CVE checking
This patch replaces the use of EXTRA functions
with using erratum entries check
to verify CVE mitigation application for some of
the SMCCC_ARCH_WORKAROUND_* calls.
Previously, EXTRA functions were individually implemented for
each SMCCC_ARCH_WORKAROUND_*, an approach that becomes unmanageable
with the increasing number of workarounds.
By looking up erratum entries for CVE check, the process is streamlined,
reducing overhead associated with creating and
maintaining EXTRA functions for each new workaround.
New Errata entries are created for SMC workarounds and
that is used to target cpus that are uniquely impacted
by SMC workarounds.
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I873534e367a35c99461d0a616ff7bf856a0000af
diff --git a/include/lib/cpus/errata.h b/include/lib/cpus/errata.h
index f720fab..235e2b9 100644
--- a/include/lib/cpus/errata.h
+++ b/include/lib/cpus/errata.h
@@ -27,6 +27,18 @@
#define ERRATA_APPLIES 1
#define ERRATA_MISSING 2
+/* Errata ID for smc workarounds */
+#define ARCH_WORKAROUND_2 2
+#define ARCH_WORKAROUND_3 3
+
+#define INCLUDE_ERRATA_LIST ( \
+ REPORT_ERRATA | \
+ ERRATA_ABI_SUPPORT | \
+ WORKAROUND_CVE_2017_5715 | \
+ WORKAROUND_CVE_2018_3639 | \
+ WORKAROUND_CVE_2022_23960 | \
+ WORKAROUND_CVE_2024_7881)
+
#ifndef __ASSEMBLER__
#include <lib/cassert.h>
@@ -71,6 +83,7 @@
int check_wa_cve_2024_7881(void);
bool errata_ich_vmcr_el2_applies(void);
struct erratum_entry *find_erratum_entry(uint32_t errata_id);
+int check_erratum_applies(uint32_t cve, int errata_id);
#else
@@ -83,8 +96,6 @@
* unlikely event that this does happen, prepending the CVE id with a 0 should
* resolve the conflict
*/
-#define ERRATUM(id) 0, id
-#define CVE(year, id) year, id
#define NO_ISB 1
#define NO_ASSERT 0
#define NO_APPLY_AT_RESET 0
@@ -97,6 +108,9 @@
#endif /* __ASSEMBLER__ */
+#define ERRATUM(id) 0, id
+#define CVE(year, id) year, id
+
/* Macro to get CPU revision code for checking errata version compatibility. */
#define CPU_REV(r, p) ((r << 4) | p)