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KVM: selftests: arm64: Test writes to CTR_EL0

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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: Sebastian Ott <sebott@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20240619174036.483943-11-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Sebastian Ott 2024-06-19 17:40:36 +00:00 committed by Oliver Upton
parent 76d3601227
commit 11a31be88f
1 changed files with 16 additions and 0 deletions
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16
tools/testing/selftests/kvm/aarch64/set_id_regs.c
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@ -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__);
}