From 77addf6e95c8689e478d607176b399a6242a777e Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Tue, 27 Mar 2018 23:01:47 +1100 Subject: [PATCH] powerpc/powernv: Set or clear security feature flags Now that we have feature flags for security related things, set or clear them based on what we see in the device tree provided by firmware. Signed-off-by: Michael Ellerman --- arch/powerpc/platforms/powernv/setup.c | 56 ++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c index 092715b9674b..f5c0c7d91db1 100644 --- a/arch/powerpc/platforms/powernv/setup.c +++ b/arch/powerpc/platforms/powernv/setup.c @@ -38,9 +38,63 @@ #include #include #include +#include #include "powernv.h" + +static bool fw_feature_is(const char *state, const char *name, + struct device_node *fw_features) +{ + struct device_node *np; + bool rc = false; + + np = of_get_child_by_name(fw_features, name); + if (np) { + rc = of_property_read_bool(np, state); + of_node_put(np); + } + + return rc; +} + +static void init_fw_feat_flags(struct device_node *np) +{ + if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np)) + security_ftr_set(SEC_FTR_SPEC_BAR_ORI31); + + if (fw_feature_is("enabled", "fw-bcctrl-serialized", np)) + security_ftr_set(SEC_FTR_BCCTRL_SERIALISED); + + if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np)) + security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30); + + if (fw_feature_is("enabled", "inst-l1d-flush-trig2", np)) + security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2); + + if (fw_feature_is("enabled", "fw-l1d-thread-split", np)) + security_ftr_set(SEC_FTR_L1D_THREAD_PRIV); + + if (fw_feature_is("enabled", "fw-count-cache-disabled", np)) + security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED); + + /* + * The features below are enabled by default, so we instead look to see + * if firmware has *disabled* them, and clear them if so. + */ + if (fw_feature_is("disabled", "speculation-policy-favor-security", np)) + security_ftr_clear(SEC_FTR_FAVOUR_SECURITY); + + if (fw_feature_is("disabled", "needs-l1d-flush-msr-pr-0-to-1", np)) + security_ftr_clear(SEC_FTR_L1D_FLUSH_PR); + + if (fw_feature_is("disabled", "needs-l1d-flush-msr-hv-1-to-0", np)) + security_ftr_clear(SEC_FTR_L1D_FLUSH_HV); + + if (fw_feature_is("disabled", "needs-spec-barrier-for-bound-checks", np)) + security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR); +} + static void pnv_setup_rfi_flush(void) { struct device_node *np, *fw_features; @@ -56,6 +110,8 @@ static void pnv_setup_rfi_flush(void) of_node_put(np); if (fw_features) { + init_fw_feat_flags(fw_features); + np = of_get_child_by_name(fw_features, "inst-l1d-flush-trig2"); if (np && of_property_read_bool(np, "enabled")) type = L1D_FLUSH_MTTRIG; -- 2.30.2