Commit 11a31be8 authored by Sebastian Ott's avatar Sebastian Ott Committed by Oliver Upton
Browse files

KVM: selftests: arm64: Test writes to CTR_EL0 



Test that CTR_EL0 is modifiable from userspace, that changes are
visible to guests, and that they are preserved across a vCPU reset.

Signed-off-by: default avatarSebastian Ott <sebott@redhat.com>
Reviewed-by: default avatarEric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20240619174036.483943-11-oliver.upton@linux.dev


Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
parent 76d36012

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

+16 −0
Original line number Diff line number Diff line
@@ -219,6 +219,7 @@ static void guest_code(void) 
	GUEST_REG_SYNC(SYS_ID_AA64MMFR1_EL1);

	GUEST_REG_SYNC(SYS_ID_AA64MMFR2_EL1);

	GUEST_REG_SYNC(SYS_ID_AA64ZFR0_EL1);

	GUEST_REG_SYNC(SYS_CTR_EL0);



	GUEST_DONE();

}
@@ -490,11 +491,25 @@ static void test_clidr(struct kvm_vcpu *vcpu) 
	test_reg_vals[encoding_to_range_idx(SYS_CLIDR_EL1)] = clidr;

}



static void test_ctr(struct kvm_vcpu *vcpu)

{

	u64 ctr;



	vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_CTR_EL0), &ctr);

	ctr &= ~CTR_EL0_DIC_MASK;

	if (ctr & CTR_EL0_IminLine_MASK)

		ctr--;



	vcpu_set_reg(vcpu, KVM_ARM64_SYS_REG(SYS_CTR_EL0), ctr);

	test_reg_vals[encoding_to_range_idx(SYS_CTR_EL0)] = ctr;

}



static void test_vcpu_ftr_id_regs(struct kvm_vcpu *vcpu)

{

	u64 val;



	test_clidr(vcpu);

	test_ctr(vcpu);



	vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_MPIDR_EL1), &val);

	val++;
@@ -525,6 +540,7 @@ static void test_reset_preserves_id_regs(struct kvm_vcpu *vcpu) 
		test_assert_id_reg_unchanged(vcpu, test_regs[i].reg);



	test_assert_id_reg_unchanged(vcpu, SYS_CLIDR_EL1);

	test_assert_id_reg_unchanged(vcpu, SYS_CTR_EL0);



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

}