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[2003:f6:af1b:ce00:e6fe:5f11:c0a7:f4a1]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-451f8311ae6sm14105175e9.2.2025.06.05.03.36.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Jun 2025 03:36:59 -0700 (PDT) From: Sebastian Ott To: Marc Zyngier , Oliver Upton Cc: Colton Lewis , Ricardo Koller , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Shuah Khan , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Sebastian Ott Subject: [PATCH v3 2/4] KVM: arm64: selftests: fix thread migration in arch_timer_edge_cases Date: Thu, 5 Jun 2025 12:36:11 +0200 Message-ID: <20250605103613.14544-3-sebott@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250605103613.14544-1-sebott@redhat.com> References: <20250605103613.14544-1-sebott@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: M2PXyQKEHeClGGgERminLp9jLPyfQTtoMzzl_BNK8ag_1749119821 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250605_033703_988596_65D074C2 X-CRM114-Status: GOOD ( 14.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org arch_timer_edge_cases tries to migrate itself across host cpus. Before the first test it migrates to cpu 0 by setting up an affinity mask with only bit 0 set. After that it looks for the next possible cpu in the current affinity mask which still has only bit 0 set. So there is no migration at all. Fix this by reading the default mask at start and use this to find the next cpu in each iteration. Signed-off-by: Sebastian Ott --- tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c b/tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c index c4716e0c1438..a813b4c6c817 100644 --- a/tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c +++ b/tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c @@ -849,17 +849,17 @@ static void guest_code(enum arch_timer timer) GUEST_DONE(); } +static cpu_set_t default_cpuset; + static uint32_t next_pcpu(void) { uint32_t max = get_nprocs(); uint32_t cur = sched_getcpu(); uint32_t next = cur; - cpu_set_t cpuset; + cpu_set_t cpuset = default_cpuset; TEST_ASSERT(max > 1, "Need at least two physical cpus"); - sched_getaffinity(0, sizeof(cpuset), &cpuset); - do { next = (next + 1) % CPU_SETSIZE; } while (!CPU_ISSET(next, &cpuset)); @@ -1046,6 +1046,8 @@ int main(int argc, char *argv[]) if (!parse_args(argc, argv)) exit(KSFT_SKIP); + sched_getaffinity(0, sizeof(default_cpuset), &default_cpuset); + if (test_args.test_virtual) { test_vm_create(&vm, &vcpu, VIRTUAL); test_run(vm, vcpu); -- 2.49.0