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[77.7.15.136]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49cca3e642dsm35357485e9.2.2026.08.28.22.50.22 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 28 Aug 2026 22:50:23 -0700 (PDT) From: Karl Mehltretter To: Marc Zyngier , Oliver Upton , kvmarm@lists.linux.dev Cc: Karl Mehltretter , Fuad Tabba , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Paolo Bonzini , Sean Christopherson , Shuah Khan , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH 2/2] KVM: arm64: selftests: Test empty SMCCC filter range at base 0 Date: Sat, 29 Aug 2026 07:48:56 +0200 Message-Id: <20260829054856.70549-3-kmehltretter@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20260829054856.70549-1-kmehltretter@gmail.com> References: <20260829054856.70549-1-kmehltretter@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit test_invalid_nr_functions() only checks an empty range at PSCI_0_2_FN64_CPU_ON, which KVM's end < start check happens to catch. It never exercised base 0, where the inclusive end wraps to U32_MAX instead. Add the base 0 case. Without the preceding fix it fails with EEXIST. Assisted-by: LLM Signed-off-by: Karl Mehltretter --- tools/testing/selftests/kvm/arm64/smccc_filter.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/testing/selftests/kvm/arm64/smccc_filter.c b/tools/testing/selftests/kvm/arm64/smccc_filter.c index 21e41880261b..a41ed3e016ba 100644 --- a/tools/testing/selftests/kvm/arm64/smccc_filter.c +++ b/tools/testing/selftests/kvm/arm64/smccc_filter.c @@ -140,6 +140,10 @@ static void test_invalid_nr_functions(void) TEST_ASSERT(r < 0 && errno == EINVAL, "Attempt to filter 0 functions should return EINVAL"); + r = __set_smccc_filter(vm, 0, 0, KVM_SMCCC_FILTER_DENY); + TEST_ASSERT(r < 0 && errno == EINVAL, + "Attempt to filter 0 functions at base 0 should return EINVAL"); + kvm_vm_free(vm); } -- 2.39.5 (Apple Git-154)