Now that we have feature flags for security related things, set or
clear them based on what we receive from the hypercall.
Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
---
arch/powerpc/platforms/pseries/setup.c | 43 ++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/arch/powerpc/platforms/pseries/setup.c
b/arch/powerpc/platforms/pseries/setup.c
index 1a527625acf7..8ae04b586abe 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -68,6 +68,7 @@
#include <asm/plpar_wrappers.h>
#include <asm/kexec.h>
#include <asm/isa-bridge.h>
+#include <asm/security_features.h>
#include "pseries.h"
@@ -459,6 +460,40 @@ static void __init find_and_init_phbs(void)
of_pci_check_probe_only();
}
+static void init_cpu_char_feature_flags(struct h_cpu_char_result *result)
+{
+ if (result->character & H_CPU_CHAR_SPEC_BAR_ORI31)
+ security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
+
+ if (result->character & H_CPU_CHAR_BCCTRL_SERIALISED)
+ security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
+
+ if (result->character & H_CPU_CHAR_L1D_FLUSH_ORI30)
+ security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
+
+ if (result->character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
+ security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);
+
+ if (result->character & H_CPU_CHAR_L1D_THREAD_PRIV)
+ security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);
+
+ if (result->character & H_CPU_CHAR_COUNT_CACHE_DISABLED)
+ 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 (!(result->character & H_CPU_BEHAV_FAVOUR_SECURITY))
+ security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
+
+ if (!(result->character & H_CPU_BEHAV_L1D_FLUSH_PR))
+ security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
+
+ if (!(result->character & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR))
+ security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
+}
+
static void pseries_setup_rfi_flush(void)
{
struct h_cpu_char_result result;
@@ -471,6 +506,8 @@ static void pseries_setup_rfi_flush(void)
rc = plpar_get_cpu_characteristics(&result);
if (rc == H_SUCCESS) {
+ init_cpu_char_feature_flags(&result);
+
types = L1D_FLUSH_NONE;
if (result.character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
@@ -490,6 +527,12 @@ static void pseries_setup_rfi_flush(void)
types = L1D_FLUSH_FALLBACK;
}
+ /*
+ * We're the guest so this doesn't apply to us, clear it to simplify
+ * handling of it elsewhere.
+ */
+ security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);
+
setup_rfi_flush(types, enable);
}
--
2.14.1
