arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support

Add the detection and runtime code for ARM_SMCCC_ARCH_WORKAROUND_1.
It is lovely. Really.

Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/bpi.S b/arch/arm64/kernel/bpi.S
index 76225c2611eac5ca508957090d5433ae04019775..fdeed629f2c6dd7317c7ef5ab2bc6b2b80f3fdf0 100644 (file)
--- a/arch/arm64/kernel/bpi.S
+++ b/arch/arm64/kernel/bpi.S
@@ -17,6 +17,7 @@
  */
 
 #include <linux/linkage.h>
+#include <linux/arm-smccc.h>
 
 .macro ventry target
        .rept 31
@@ -85,3 +86,22 @@ ENTRY(__qcom_hyp_sanitize_link_stack_start)
        .endr
        ldp     x29, x30, [sp], #16
 ENTRY(__qcom_hyp_sanitize_link_stack_end)
+
+.macro smccc_workaround_1 inst
+       sub     sp, sp, #(8 * 4)
+       stp     x2, x3, [sp, #(8 * 0)]
+       stp     x0, x1, [sp, #(8 * 2)]
+       mov     w0, #ARM_SMCCC_ARCH_WORKAROUND_1
+       \inst   #0
+       ldp     x2, x3, [sp, #(8 * 0)]
+       ldp     x0, x1, [sp, #(8 * 2)]
+       add     sp, sp, #(8 * 4)
+.endm
+
+ENTRY(__smccc_workaround_1_smc_start)
+       smccc_workaround_1      smc
+ENTRY(__smccc_workaround_1_smc_end)
+
+ENTRY(__smccc_workaround_1_hvc_start)
+       smccc_workaround_1      hvc
+ENTRY(__smccc_workaround_1_hvc_end)

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index ed688188223175428af83dd288e8d8c6408e78a1..9e77809a3b23078ed36ee3044152498fb21e361b 100644 (file)
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -70,6 +70,10 @@ DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
 extern char __psci_hyp_bp_inval_start[], __psci_hyp_bp_inval_end[];
 extern char __qcom_hyp_sanitize_link_stack_start[];
 extern char __qcom_hyp_sanitize_link_stack_end[];
+extern char __smccc_workaround_1_smc_start[];
+extern char __smccc_workaround_1_smc_end[];
+extern char __smccc_workaround_1_hvc_start[];
+extern char __smccc_workaround_1_hvc_end[];
 
 static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start,
                                const char *hyp_vecs_end)
@@ -116,6 +120,10 @@ static void __install_bp_hardening_cb(bp_hardening_cb_t fn,
 #define __psci_hyp_bp_inval_end                        NULL
 #define __qcom_hyp_sanitize_link_stack_start   NULL
 #define __qcom_hyp_sanitize_link_stack_end     NULL
+#define __smccc_workaround_1_smc_start         NULL
+#define __smccc_workaround_1_smc_end           NULL
+#define __smccc_workaround_1_hvc_start         NULL
+#define __smccc_workaround_1_hvc_end           NULL
 
 static void __install_bp_hardening_cb(bp_hardening_cb_t fn,
                                      const char *hyp_vecs_start,
@@ -142,17 +150,75 @@ static void  install_bp_hardening_cb(const struct arm64_cpu_capabilities *entry,
        __install_bp_hardening_cb(fn, hyp_vecs_start, hyp_vecs_end);
 }
 
+#include <uapi/linux/psci.h>
+#include <linux/arm-smccc.h>
 #include <linux/psci.h>
 
+static void call_smc_arch_workaround_1(void)
+{
+       arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
+}
+
+static void call_hvc_arch_workaround_1(void)
+{
+       arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
+}
+
+static bool check_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry)
+{
+       bp_hardening_cb_t cb;
+       void *smccc_start, *smccc_end;
+       struct arm_smccc_res res;
+
+       if (!entry->matches(entry, SCOPE_LOCAL_CPU))
+               return false;
+
+       if (psci_ops.smccc_version == SMCCC_VERSION_1_0)
+               return false;
+
+       switch (psci_ops.conduit) {
+       case PSCI_CONDUIT_HVC:
+               arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
+                                 ARM_SMCCC_ARCH_WORKAROUND_1, &res);
+               if (res.a0)
+                       return false;
+               cb = call_hvc_arch_workaround_1;
+               smccc_start = __smccc_workaround_1_hvc_start;
+               smccc_end = __smccc_workaround_1_hvc_end;
+               break;
+
+       case PSCI_CONDUIT_SMC:
+               arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
+                                 ARM_SMCCC_ARCH_WORKAROUND_1, &res);
+               if (res.a0)
+                       return false;
+               cb = call_smc_arch_workaround_1;
+               smccc_start = __smccc_workaround_1_smc_start;
+               smccc_end = __smccc_workaround_1_smc_end;
+               break;
+
+       default:
+               return false;
+       }
+
+       install_bp_hardening_cb(entry, cb, smccc_start, smccc_end);
+
+       return true;
+}
+
 static int enable_psci_bp_hardening(void *data)
 {
        const struct arm64_cpu_capabilities *entry = data;
 
-       if (psci_ops.get_version)
+       if (psci_ops.get_version) {
+               if (check_smccc_arch_workaround_1(entry))
+                       return 0;
+
                install_bp_hardening_cb(entry,
                                       (bp_hardening_cb_t)psci_ops.get_version,
                                       __psci_hyp_bp_inval_start,
                                       __psci_hyp_bp_inval_end);
+       }
 
        return 0;
 }