ARM: KVM: Move the HYP code to its own section

In order to be able to spread the HYP code into multiple compilation
units, adopt a layout similar to that of arm64:
- the HYP text is emited in its own section (.hyp.text)
- two linker generated symbols are use to identify the boundaries
  of that section

No functionnal change.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

arch/arm/include/asm/kvm_asm.h

@@ -19,6 +19,8 @@
 #ifndef __ARM_KVM_ASM_H__
 #define __ARM_KVM_ASM_H__
 
+#include <asm/virt.h>
+
 /* 0 is reserved as an invalid value. */
 #define c0_MPIDR	1	/* MultiProcessor ID Register */
 #define c0_CSSELR	2	/* Cache Size Selection Register */
@@ -91,8 +93,8 @@ extern char __kvm_hyp_exit_end[];
 
 extern char __kvm_hyp_vector[];
 
-extern char __kvm_hyp_code_start[];
-extern char __kvm_hyp_code_end[];
+#define	__kvm_hyp_code_start	__hyp_text_start
+#define __kvm_hyp_code_end	__hyp_text_end
 
 extern void __kvm_flush_vm_context(void);
 extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);

arch/arm/include/asm/virt.h

@@ -74,6 +74,10 @@ static inline bool is_hyp_mode_mismatched(void)
 {
 	return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH);
 }
+
+/* The section containing the hypervisor text */
+extern char __hyp_text_start[];
+extern char __hyp_text_end[];
 #endif
 
 #endif /* __ASSEMBLY__ */