RISC-V: KVM: Make ISA ext mappings explicit

While adding new extensions at the bottom of the array isn't hard to
do, it's a pain to review in order to ensure we're not missing any.
Also, resolving merge conflicts for multiple new ISA extensions can be
error-prone. To make adding new mappings foolproof, explicitly assign
the array elements. And, now that the order doesn't matter, we can
alphabetize the extensions, so we do that too.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>

arch/riscv/kvm/vcpu.c

@@ -42,19 +42,22 @@ const struct kvm_stats_header kvm_vcpu_stats_header = {
 
 #define KVM_RISCV_BASE_ISA_MASK		GENMASK(25, 0)
 
+#define KVM_ISA_EXT_ARR(ext)		[KVM_RISCV_ISA_EXT_##ext] = RISCV_ISA_EXT_##ext
+
 /* Mapping between KVM ISA Extension ID & Host ISA extension ID */
 static const unsigned long kvm_isa_ext_arr[] = {
-	RISCV_ISA_EXT_a,
-	RISCV_ISA_EXT_c,
-	RISCV_ISA_EXT_d,
-	RISCV_ISA_EXT_f,
-	RISCV_ISA_EXT_h,
-	RISCV_ISA_EXT_i,
-	RISCV_ISA_EXT_m,
-	RISCV_ISA_EXT_SVPBMT,
-	RISCV_ISA_EXT_SSTC,
-	RISCV_ISA_EXT_SVINVAL,
-	RISCV_ISA_EXT_ZIHINTPAUSE,
+	[KVM_RISCV_ISA_EXT_A] = RISCV_ISA_EXT_a,
+	[KVM_RISCV_ISA_EXT_C] = RISCV_ISA_EXT_c,
+	[KVM_RISCV_ISA_EXT_D] = RISCV_ISA_EXT_d,
+	[KVM_RISCV_ISA_EXT_F] = RISCV_ISA_EXT_f,
+	[KVM_RISCV_ISA_EXT_H] = RISCV_ISA_EXT_h,
+	[KVM_RISCV_ISA_EXT_I] = RISCV_ISA_EXT_i,
+	[KVM_RISCV_ISA_EXT_M] = RISCV_ISA_EXT_m,
+
+	KVM_ISA_EXT_ARR(SSTC),
+	KVM_ISA_EXT_ARR(SVINVAL),
+	KVM_ISA_EXT_ARR(SVPBMT),
+	KVM_ISA_EXT_ARR(ZIHINTPAUSE),
 };
 
 static unsigned long kvm_riscv_vcpu_base2isa_ext(unsigned long base_ext)