[PATCH v6 18/24] KVM: riscv: selftests: Add helper functions for extension checks

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__vcpu_has_ext can check both SBI and ISA extensions when the first
argument is properly converted to SBI/ISA extension IDs. Introduce
two helper functions to make life easier for developers so they
don't have to worry about the conversions.

Replace the current usages as well with new helpers.

Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
Signed-off-by: Atish Patra <atishp@xxxxxxxxxxxx>
 tools/testing/selftests/kvm/include/riscv/processor.h | 10 ++++++++++
 tools/testing/selftests/kvm/riscv/arch_timer.c        |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/include/riscv/processor.h b/tools/testing/selftests/kvm/include/riscv/processor.h
index 3b9cb39327ff..5f389166338c 100644
--- a/tools/testing/selftests/kvm/include/riscv/processor.h
+++ b/tools/testing/selftests/kvm/include/riscv/processor.h
@@ -50,6 +50,16 @@ static inline uint64_t __kvm_reg_id(uint64_t type, uint64_t subtype,
 bool __vcpu_has_ext(struct kvm_vcpu *vcpu, uint64_t ext);
+static inline bool __vcpu_has_isa_ext(struct kvm_vcpu *vcpu, uint64_t isa_ext)
+	return __vcpu_has_ext(vcpu, RISCV_ISA_EXT_REG(isa_ext));
+static inline bool __vcpu_has_sbi_ext(struct kvm_vcpu *vcpu, uint64_t sbi_ext)
+	return __vcpu_has_ext(vcpu, RISCV_SBI_EXT_REG(sbi_ext));
 struct ex_regs {
 	unsigned long ra;
 	unsigned long sp;
diff --git a/tools/testing/selftests/kvm/riscv/arch_timer.c b/tools/testing/selftests/kvm/riscv/arch_timer.c
index 0f9cabd99fd4..735b78569021 100644
--- a/tools/testing/selftests/kvm/riscv/arch_timer.c
+++ b/tools/testing/selftests/kvm/riscv/arch_timer.c
@@ -85,7 +85,7 @@ struct kvm_vm *test_vm_create(void)
 	int nr_vcpus = test_args.nr_vcpus;
 	vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus);
+	__TEST_REQUIRE(__vcpu_has_isa_ext(vcpus[0], KVM_RISCV_ISA_EXT_SSTC),
 				   "SSTC not available, skipping test\n");

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