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Message-Id: <20241217212358.3709634-1-oliver.upton@linux.dev>
Date: Tue, 17 Dec 2024 13:23:58 -0800
From: Oliver Upton <oliver.upton@...ux.dev>
To: kvmarm@...ts.linux.dev
Cc: Marc Zyngier <maz@...nel.org>,
Joey Gouly <joey.gouly@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Zenghui Yu <yuzenghui@...wei.com>,
Mingwei Zhang <mizhang@...gle.com>,
Colton Lewis <coltonlewis@...gle.com>,
Raghavendra Rao Ananta <rananta@...gle.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Mark Rutland <mark.rutland@....com>,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
Oliver Upton <oliver.upton@...ux.dev>
Subject: [HACK PATCH 18/18] KVM: arm64: selftests: Add test for probing PMUv3 sysregs
Add a test for sniffing out PMUv3 register traps.
Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>
---
Not intended to be applied, just sharing in case someone finds it
useful.
tools/testing/selftests/kvm/Makefile | 1 +
.../kvm/aarch64/pmuv3_register_probe.c | 135 ++++++++++++++++++
2 files changed, 136 insertions(+)
create mode 100644 tools/testing/selftests/kvm/aarch64/pmuv3_register_probe.c
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 41593d2e7de9..739542928306 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -159,6 +159,7 @@ TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
TEST_GEN_PROGS_aarch64 += aarch64/hypercalls
TEST_GEN_PROGS_aarch64 += aarch64/mmio_abort
TEST_GEN_PROGS_aarch64 += aarch64/page_fault_test
+TEST_GEN_PROGS_aarch64 += aarch64/pmuv3_register_probe
TEST_GEN_PROGS_aarch64 += aarch64/psci_test
TEST_GEN_PROGS_aarch64 += aarch64/set_id_regs
TEST_GEN_PROGS_aarch64 += aarch64/smccc_filter
diff --git a/tools/testing/selftests/kvm/aarch64/pmuv3_register_probe.c b/tools/testing/selftests/kvm/aarch64/pmuv3_register_probe.c
new file mode 100644
index 000000000000..859b0162dbeb
--- /dev/null
+++ b/tools/testing/selftests/kvm/aarch64/pmuv3_register_probe.c
@@ -0,0 +1,135 @@
+#include <perf/arm_pmuv3.h>
+
+#include "vgic.h"
+#include "test_util.h"
+#include "processor.h"
+
+static bool undef_taken;
+
+#define test_read(sr) \
+do { \
+ u64 __val = read_sysreg(sr); \
+ \
+ if (READ_ONCE(undef_taken)) \
+ GUEST_PRINTF("read_sysreg("#sr"): UNDEFINED\n"); \
+ else \
+ GUEST_PRINTF("read_sysreg("#sr"): %lx\n", __val); \
+ WRITE_ONCE(undef_taken, false); \
+} while (0)
+
+#define test_write(val, sr) \
+do { \
+ write_sysreg(val, sr); \
+ \
+ if (READ_ONCE(undef_taken)) \
+ GUEST_PRINTF("write_sysreg(%x, "#sr"): UNDEFINED\n", val); \
+ else \
+ GUEST_PRINTF("write_sysreg(%x, "#sr"): OK\n", val); \
+ WRITE_ONCE(undef_taken, false); \
+} while (0)
+
+static void guest_undef_handler(struct ex_regs *regs)
+{
+ WRITE_ONCE(undef_taken, true);
+ regs->pc += 4;
+}
+
+#define READ_PMEVCNTRN(n) test_read(pmevcntr##n##_el0)
+static void test_read_evcntr(int n)
+{
+ PMEVN_SWITCH(n, READ_PMEVCNTRN);
+}
+
+#define READ_PMEVTYPERN(n) test_read(pmevtyper##n##_el0);
+static void test_read_evtyper(int n)
+{
+ PMEVN_SWITCH(n, READ_PMEVTYPERN);
+}
+
+static void guest_code(void)
+{
+ test_read(pmcr_el0);
+ test_read(pmcntenset_el0);
+ test_read(pmcntenclr_el0);
+ test_read(pmovsset_el0);
+ test_read(pmovsclr_el0);
+ test_read(pmintenset_el1);
+ test_read(pmintenclr_el1);
+ test_read(pmceid0_el0);
+ test_read(pmceid1_el0);
+
+ test_read(pmccntr_el0);
+ test_read(pmccfiltr_el0);
+ test_write(0, pmswinc_el0);
+
+ test_write(0, pmselr_el0);
+ test_read(pmxevcntr_el0);
+ test_read(pmxevtyper_el0);
+
+ test_read(pmuserenr_el0);
+
+ for (int i = 0; i < 31; i++) {
+ test_read_evcntr(i);
+ test_read_evtyper(i);
+ }
+
+ GUEST_DONE();
+}
+
+static void run_test(struct kvm_vcpu *vcpu)
+{
+ struct ucall uc;
+
+ while (true) {
+ vcpu_run(vcpu);
+
+ switch (get_ucall(vcpu, &uc)) {
+ case UCALL_PRINTF:
+ REPORT_GUEST_PRINTF(uc);
+ break;
+ case UCALL_DONE:
+ return;
+ default:
+ TEST_FAIL("Unknown ucall %lu", uc.cmd);
+ }
+ }
+}
+
+int main(void)
+{
+ struct kvm_device_attr attr;
+ struct kvm_vcpu_init init;
+ struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+ int irq = 23;
+
+ TEST_REQUIRE(kvm_has_cap(KVM_CAP_ARM_PMU_V3));
+
+ vm = vm_create(1);
+ vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init);
+ init.features[0] |= (1 << KVM_ARM_VCPU_PMU_V3);
+ vcpu = aarch64_vcpu_add(vm, 0, &init, guest_code);
+
+ __TEST_REQUIRE(vgic_v3_setup(vm, 1, 64) >= 0,
+ "Failed to create vgic-v3, skipping");
+
+ vm_init_descriptor_tables(vm);
+ vcpu_init_descriptor_tables(vcpu);
+ vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT, ESR_ELx_EC_UNKNOWN,
+ guest_undef_handler);
+
+ attr = (struct kvm_device_attr) {
+ .group = KVM_ARM_VCPU_PMU_V3_CTRL,
+ .attr = KVM_ARM_VCPU_PMU_V3_IRQ,
+ .addr = (u64)&irq,
+ };
+ vcpu_ioctl(vcpu, KVM_SET_DEVICE_ATTR, &attr);
+
+ attr = (struct kvm_device_attr) {
+ .group = KVM_ARM_VCPU_PMU_V3_CTRL,
+ .attr = KVM_ARM_VCPU_PMU_V3_INIT,
+ };
+ vcpu_ioctl(vcpu, KVM_SET_DEVICE_ATTR, &attr);
+
+ run_test(vcpu);
+}
--
2.39.5
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