arm64: kvm: Modernize __smccc_workaround_1_smc_start annotations

In an effort to clarify and simplify the annotation of assembly functions
in the kernel new macros have been introduced. These replace ENTRY and
ENDPROC with separate annotations for standard C callable functions,
data and code with different calling conventions.

Using these for __smccc_workaround_1_smc is more involved than for most
symbols as this symbol is annotated quite unusually, rather than just have
the explicit symbol we define _start and _end symbols which we then use to
compute the length. This does not play at all nicely with the new style
macros. Instead define a constant for the size of the function and use that
in both the C code and for .org based size checks in the assembly code.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 44a2437..7c7eeea 100644 (file)
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -36,6 +36,8 @@
  */
 #define KVM_VECTOR_PREAMBLE    (2 * AARCH64_INSN_SIZE)
 
+#define __SMCCC_WORKAROUND_1_SMC_SZ 36
+
 #ifndef __ASSEMBLY__
 
 #include <linux/mm.h>
@@ -75,6 +77,8 @@ extern void __vgic_v3_init_lrs(void);
 
 extern u32 __kvm_get_mdcr_el2(void);
 
+extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ];
+
 /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
 #define __hyp_this_cpu_ptr(sym)                                                \
        ({                                                              \

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 0af2201..6a2ca33 100644 (file)
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -11,6 +11,7 @@
 #include <asm/cpu.h>
 #include <asm/cputype.h>
 #include <asm/cpufeature.h>
+#include <asm/kvm_asm.h>
 #include <asm/smp_plat.h>
 
 static bool __maybe_unused
@@ -113,9 +114,6 @@ atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1);
 DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
 
 #ifdef CONFIG_KVM_INDIRECT_VECTORS
-extern char __smccc_workaround_1_smc_start[];
-extern char __smccc_workaround_1_smc_end[];
-
 static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start,
                                const char *hyp_vecs_end)
 {
@@ -163,9 +161,6 @@ static void install_bp_hardening_cb(bp_hardening_cb_t fn,
        raw_spin_unlock(&bp_lock);
 }
 #else
-#define __smccc_workaround_1_smc_start         NULL
-#define __smccc_workaround_1_smc_end           NULL
-
 static void install_bp_hardening_cb(bp_hardening_cb_t fn,
                                      const char *hyp_vecs_start,
                                      const char *hyp_vecs_end)
@@ -239,11 +234,14 @@ static int detect_harden_bp_fw(void)
                smccc_end = NULL;
                break;
 
+#if IS_ENABLED(CONFIG_KVM_ARM_HOST)
        case SMCCC_CONDUIT_SMC:
                cb = call_smc_arch_workaround_1;
-               smccc_start = __smccc_workaround_1_smc_start;
-               smccc_end = __smccc_workaround_1_smc_end;
+               smccc_start = __smccc_workaround_1_smc;
+               smccc_end = __smccc_workaround_1_smc +
+                       __SMCCC_WORKAROUND_1_SMC_SZ;
                break;
+#endif
 
        default:
                return -1;

diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S
index 1e2ab92..c2a13ab 100644 (file)
--- a/arch/arm64/kvm/hyp/hyp-entry.S
+++ b/arch/arm64/kvm/hyp/hyp-entry.S
@@ -322,7 +322,7 @@ SYM_CODE_END(__bp_harden_hyp_vecs)
 
        .popsection
 
-ENTRY(__smccc_workaround_1_smc_start)
+SYM_CODE_START(__smccc_workaround_1_smc)
        esb
        sub     sp, sp, #(8 * 4)
        stp     x2, x3, [sp, #(8 * 0)]
@@ -332,5 +332,7 @@ ENTRY(__smccc_workaround_1_smc_start)
        ldp     x2, x3, [sp, #(8 * 0)]
        ldp     x0, x1, [sp, #(8 * 2)]
        add     sp, sp, #(8 * 4)
-ENTRY(__smccc_workaround_1_smc_end)
+1:     .org __smccc_workaround_1_smc + __SMCCC_WORKAROUND_1_SMC_SZ
+       .org 1b
+SYM_CODE_END(__smccc_workaround_1_smc)
 #endif