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Message-ID: <20240603130507.17597-7-sebott@redhat.com>
Date: Mon, 3 Jun 2024 15:05:07 +0200
From: Sebastian Ott <sebott@...hat.com>
To: linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.linux.dev,
linux-kernel@...r.kernel.org
Cc: Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>,
James Morse <james.morse@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Shaoqin Huang <shahuang@...hat.com>,
Eric Auger <eric.auger@...hat.com>
Subject: [PATCH v4 6/6] 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: Sebastian Ott <sebott@...hat.com>
Reviewed-by: Eric Auger <eric.auger@...hat.com>
---
.../testing/selftests/kvm/aarch64/set_id_regs.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/tools/testing/selftests/kvm/aarch64/set_id_regs.c b/tools/testing/selftests/kvm/aarch64/set_id_regs.c
index a7de39fa2a0a..9583c04f1228 100644
--- a/tools/testing/selftests/kvm/aarch64/set_id_regs.c
+++ b/tools/testing/selftests/kvm/aarch64/set_id_regs.c
@@ -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__);
}
--
2.42.0
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