arm64: KVM: Move BP hardening vectors into .hyp.text section

There is no reason why the BP hardening vectors shouldn't be part
of the HYP text at compile time, rather than being mapped at runtime.

Also introduce a new config symbol that controls the compilation
of bpi.S.
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: NAndrew Jones <drjones@redhat.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

arch/arm64/include/asm/kvm_mmu.h

@@ -380,9 +380,7 @@ static inline void *kvm_get_hyp_vector(void)
 
 static inline int kvm_map_vectors(void)
 {
-	return create_hyp_mappings(kvm_ksym_ref(__bp_harden_hyp_vecs_start),
-				   kvm_ksym_ref(__bp_harden_hyp_vecs_end),
-				   PAGE_HYP_EXEC);
+	return 0;
 }
 
 #else

arch/arm64/kernel/Makefile

@@ -54,9 +54,7 @@ arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
 arm64-obj-$(CONFIG_CRASH_DUMP)		+= crash_dump.o
 arm64-obj-$(CONFIG_ARM_SDE_INTERFACE)	+= sdei.o
 
-ifeq ($(CONFIG_KVM),y)
-arm64-obj-$(CONFIG_HARDEN_BRANCH_PREDICTOR)	+= bpi.o
-endif
+arm64-obj-$(CONFIG_KVM_INDIRECT_VECTORS)+= bpi.o
 
 obj-y					+= $(arm64-obj-y) vdso/ probes/
 obj-m					+= $(arm64-obj-m)

arch/arm64/kernel/bpi.S

@@ -48,6 +48,10 @@
 	ventry \target + 0x780
 .endm
 
+
+	.text
+	.pushsection	.hyp.text, "ax"
+
 	.align	11
 ENTRY(__bp_harden_hyp_vecs_start)
 	.rept 4
@@ -55,6 +59,8 @@ ENTRY(__bp_harden_hyp_vecs_start)
 	.endr
 ENTRY(__bp_harden_hyp_vecs_end)
 
+	.popsection
+
 ENTRY(__qcom_hyp_sanitize_link_stack_start)
 	stp     x29, x30, [sp, #-16]!
 	.rept	16

arch/arm64/kvm/Kconfig

@@ -57,6 +57,9 @@ config KVM_ARM_PMU
 	  Adds support for a virtual Performance Monitoring Unit (PMU) in
 	  virtual machines.
 
+config KVM_INDIRECT_VECTORS
+       def_bool KVM && HARDEN_BRANCH_PREDICTOR
+
 source drivers/vhost/Kconfig
 
 endif # VIRTUALIZATION