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Merge pull request #1688 from JoelHutton/jh/variant_1_mitigations

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Initial Spectre V1 mitigations (CVE-2017-5753).
This commit is contained in:
Antonio Niño Díaz 2018-11-29 16:05:50 +01:00 • committed by GitHub
commit 37e8ab5323
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 9 additions and 2 deletions
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7
include/lib/utils_def.h
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@ -162,4 +162,11 @@
#define COMPILER_BARRIER() __asm__ volatile ("" ::: "memory")
/* Compiler builtin of GCC >= 9 and planned in llvm */
#ifdef __HAVE_SPECULATION_SAFE_VALUE
# define SPECULATION_SAFE_VALUE(var) __builtin_speculation_safe_value(var)
#else
# define SPECULATION_SAFE_VALUE(var) var
#endif
#endif /* UTILS_DEF_H */

4
lib/psci/psci_stat.c
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@ -206,9 +206,9 @@ static int psci_get_stat(u_register_t target_cpu, unsigned int power_state,
if (pwrlvl > PSCI_CPU_PWR_LVL) {
/* Get the power domain index */
parent_idx = psci_cpu_pd_nodes[target_idx].parent_node;
parent_idx = SPECULATION_SAFE_VALUE(psci_cpu_pd_nodes[target_idx].parent_node);
for (lvl = PSCI_CPU_PWR_LVL + 1U; lvl < pwrlvl; lvl++)
parent_idx = psci_non_cpu_pd_nodes[parent_idx].parent_node;
parent_idx = SPECULATION_SAFE_VALUE(psci_non_cpu_pd_nodes[parent_idx].parent_node);
/* Get the non cpu power domain stats */
*psci_stat = psci_non_cpu_stat[parent_idx][stat_idx];