KVM: arm64: selftests: Introduce ARM64_SYS_KVM_REG

With the inclusion of sysreg.h, that brings in system register
encodings, it would be redundant to re-define register encodings
again in processor.h to use it with ARM64_SYS_REG for the KVM
functions such as set_reg() or get_reg(). Hence, add helper macro,
ARM64_SYS_KVM_REG, that converts SYS_* definitions in sysreg.h
into ARM64_SYS_REG definitions.

Also replace all the users of ARM64_SYS_REG, relying on
the encodings created in processor.h, with ARM64_SYS_KVM_REG and
remove the definitions.
Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211007233439.1826892-5-rananta@google.com

tools/testing/selftests/kvm/aarch64/debug-exceptions.c

@@ -190,7 +190,7 @@ static int debug_version(struct kvm_vm *vm)
 {
 	uint64_t id_aa64dfr0;
 
-	get_reg(vm, VCPU_ID, ARM64_SYS_REG(ID_AA64DFR0_EL1), &id_aa64dfr0);
+	get_reg(vm, VCPU_ID, KVM_ARM64_SYS_REG(SYS_ID_AA64DFR0_EL1), &id_aa64dfr0);
 	return id_aa64dfr0 & 0xf;
 }
 

tools/testing/selftests/kvm/aarch64/psci_cpu_on_test.c

@@ -91,7 +91,7 @@ int main(void)
 	init.features[0] |= (1 << KVM_ARM_VCPU_POWER_OFF);
 	aarch64_vcpu_add_default(vm, VCPU_ID_TARGET, &init, guest_main);
 
-	get_reg(vm, VCPU_ID_TARGET, ARM64_SYS_REG(MPIDR_EL1), &target_mpidr);
+	get_reg(vm, VCPU_ID_TARGET, KVM_ARM64_SYS_REG(SYS_MPIDR_EL1), &target_mpidr);
 	vcpu_args_set(vm, VCPU_ID_SOURCE, 1, target_mpidr & MPIDR_HWID_BITMASK);
 	vcpu_run(vm, VCPU_ID_SOURCE);
 

tools/testing/selftests/kvm/include/aarch64/processor.h

@@ -16,15 +16,17 @@
 #define ARM64_CORE_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \
 			   KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(x))
 
-#define CPACR_EL1               3, 0,  1, 0, 2
-#define TCR_EL1                 3, 0,  2, 0, 2
-#define MAIR_EL1                3, 0, 10, 2, 0
-#define MPIDR_EL1               3, 0,  0, 0, 5
-#define TTBR0_EL1               3, 0,  2, 0, 0
-#define SCTLR_EL1               3, 0,  1, 0, 0
-#define VBAR_EL1                3, 0, 12, 0, 0
-
-#define ID_AA64DFR0_EL1         3, 0,  0, 5, 0
+/*
+ * KVM_ARM64_SYS_REG(sys_reg_id): Helper macro to convert
+ * SYS_* register definitions in asm/sysreg.h to use in KVM
+ * calls such as get_reg() and set_reg().
+ */
+#define KVM_ARM64_SYS_REG(sys_reg_id)			\
+	ARM64_SYS_REG(sys_reg_Op0(sys_reg_id),		\
+			sys_reg_Op1(sys_reg_id),	\
+			sys_reg_CRn(sys_reg_id),	\
+			sys_reg_CRm(sys_reg_id),	\
+			sys_reg_Op2(sys_reg_id))
 
 /*
  * Default MAIR

tools/testing/selftests/kvm/lib/aarch64/processor.c

@@ -232,10 +232,10 @@ void aarch64_vcpu_setup(struct kvm_vm *vm, int vcpuid, struct kvm_vcpu_init *ini
 	 * Enable FP/ASIMD to avoid trapping when accessing Q0-Q15
 	 * registers, which the variable argument list macros do.
 	 */
-	set_reg(vm, vcpuid, ARM64_SYS_REG(CPACR_EL1), 3 << 20);
+	set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_CPACR_EL1), 3 << 20);
 
-	get_reg(vm, vcpuid, ARM64_SYS_REG(SCTLR_EL1), &sctlr_el1);
-	get_reg(vm, vcpuid, ARM64_SYS_REG(TCR_EL1), &tcr_el1);
+	get_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_SCTLR_EL1), &sctlr_el1);
+	get_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_TCR_EL1), &tcr_el1);
 
 	switch (vm->mode) {
 	case VM_MODE_P52V48_4K:
@@ -273,10 +273,10 @@ void aarch64_vcpu_setup(struct kvm_vm *vm, int vcpuid, struct kvm_vcpu_init *ini
 	tcr_el1 |= (1 << 8) | (1 << 10) | (3 << 12);
 	tcr_el1 |= (64 - vm->va_bits) /* T0SZ */;
 
-	set_reg(vm, vcpuid, ARM64_SYS_REG(SCTLR_EL1), sctlr_el1);
-	set_reg(vm, vcpuid, ARM64_SYS_REG(TCR_EL1), tcr_el1);
-	set_reg(vm, vcpuid, ARM64_SYS_REG(MAIR_EL1), DEFAULT_MAIR_EL1);
-	set_reg(vm, vcpuid, ARM64_SYS_REG(TTBR0_EL1), vm->pgd);
+	set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_SCTLR_EL1), sctlr_el1);
+	set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_TCR_EL1), tcr_el1);
+	set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_MAIR_EL1), DEFAULT_MAIR_EL1);
+	set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_TTBR0_EL1), vm->pgd);
 }
 
 void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
@@ -362,7 +362,7 @@ void vcpu_init_descriptor_tables(struct kvm_vm *vm, uint32_t vcpuid)
 {
 	extern char vectors;
 
-	set_reg(vm, vcpuid, ARM64_SYS_REG(VBAR_EL1), (uint64_t)&vectors);
+	set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_VBAR_EL1), (uint64_t)&vectors);
 }
 
 void route_exception(struct ex_regs *regs, int vector)