Commit 07eabd8a authored by Oliver Upton's avatar Oliver Upton Committed by Marc Zyngier
Browse files

KVM: selftests: arm64: Test that feature ID regs survive a reset 



One of the expectations with feature ID registers is that their values
survive a vCPU reset. Start testing that.

Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240502233529.1958459-7-oliver.upton@linux.dev


Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
parent 46247a31

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

+33 −8
Original line number Diff line number Diff line
@@ -457,13 +457,36 @@ static void test_guest_reg_read(struct kvm_vcpu *vcpu) 
	}

}



static void test_assert_id_reg_unchanged(struct kvm_vcpu *vcpu, uint32_t encoding)

{

	size_t idx = encoding_to_range_idx(encoding);

	uint64_t observed;



	vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(encoding), &observed);

	TEST_ASSERT_EQ(test_reg_vals[idx], observed);

}



static void test_reset_preserves_id_regs(struct kvm_vcpu *vcpu)

{

	/*

	 * Calls KVM_ARM_VCPU_INIT behind the scenes, which will do an

	 * architectural reset of the vCPU.

	 */

	aarch64_vcpu_setup(vcpu, NULL);



	for (int i = 0; i < ARRAY_SIZE(test_regs); i++)

		test_assert_id_reg_unchanged(vcpu, test_regs[i].reg);



	ksft_test_result_pass("%s\n", __func__);

}



int main(void)

{

	struct kvm_vcpu *vcpu;

	struct kvm_vm *vm;

	bool aarch64_only;

	uint64_t val, el0;

	int ftr_cnt;

	int test_cnt;



	TEST_REQUIRE(kvm_has_cap(KVM_CAP_ARM_SUPPORTED_REG_MASK_RANGES));
@@ -476,18 +499,20 @@ int main(void) 


	ksft_print_header();



	ftr_cnt = ARRAY_SIZE(ftr_id_aa64dfr0_el1) + ARRAY_SIZE(ftr_id_dfr0_el1) +

	test_cnt = ARRAY_SIZE(ftr_id_aa64dfr0_el1) + ARRAY_SIZE(ftr_id_dfr0_el1) +

		   ARRAY_SIZE(ftr_id_aa64isar0_el1) + ARRAY_SIZE(ftr_id_aa64isar1_el1) +

		   ARRAY_SIZE(ftr_id_aa64isar2_el1) + ARRAY_SIZE(ftr_id_aa64pfr0_el1) +

		   ARRAY_SIZE(ftr_id_aa64mmfr0_el1) + ARRAY_SIZE(ftr_id_aa64mmfr1_el1) +

		   ARRAY_SIZE(ftr_id_aa64mmfr2_el1) + ARRAY_SIZE(ftr_id_aa64zfr0_el1) -

		  ARRAY_SIZE(test_regs);

		   ARRAY_SIZE(test_regs) + 1;



	ksft_set_plan(ftr_cnt);

	ksft_set_plan(test_cnt);



	test_vm_ftr_id_regs(vcpu, aarch64_only);

	test_guest_reg_read(vcpu);



	test_reset_preserves_id_regs(vcpu);



	kvm_vm_free(vm);



	ksft_finished();