forked from Minki/linux
KVM: arm64: selftests: Add arch_timer test
Add a KVM selftest to validate the arch_timer functionality. Primarily, the test sets up periodic timer interrupts and validates the basic architectural expectations upon its receipt. The test provides command-line options to configure the period of the timer, number of iterations, and number of vCPUs. Signed-off-by: Raghavendra Rao Ananta <rananta@google.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20211007233439.1826892-15-rananta@google.com
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parent
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1
tools/testing/selftests/kvm/.gitignore
vendored
1
tools/testing/selftests/kvm/.gitignore
vendored
@ -1,4 +1,5 @@
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# SPDX-License-Identifier: GPL-2.0-only
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/aarch64/arch_timer
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/aarch64/debug-exceptions
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/aarch64/get-reg-list
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/aarch64/psci_cpu_on_test
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@ -86,6 +86,7 @@ TEST_GEN_PROGS_x86_64 += set_memory_region_test
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TEST_GEN_PROGS_x86_64 += steal_time
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TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test
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TEST_GEN_PROGS_aarch64 += aarch64/arch_timer
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TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
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TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
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TEST_GEN_PROGS_aarch64 += aarch64/psci_cpu_on_test
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366
tools/testing/selftests/kvm/aarch64/arch_timer.c
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tools/testing/selftests/kvm/aarch64/arch_timer.c
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@ -0,0 +1,366 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch_timer.c - Tests the aarch64 timer IRQ functionality
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*
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* The test validates both the virtual and physical timer IRQs using
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* CVAL and TVAL registers. This consitutes the four stages in the test.
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* The guest's main thread configures the timer interrupt for a stage
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* and waits for it to fire, with a timeout equal to the timer period.
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* It asserts that the timeout doesn't exceed the timer period.
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*
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* On the other hand, upon receipt of an interrupt, the guest's interrupt
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* handler validates the interrupt by checking if the architectural state
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* is in compliance with the specifications.
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*
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* The test provides command-line options to configure the timer's
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* period (-p), number of vCPUs (-n), and iterations per stage (-i).
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*
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* Copyright (c) 2021, Google LLC.
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*/
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <pthread.h>
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#include <linux/kvm.h>
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#include <linux/sizes.h>
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#include "kvm_util.h"
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#include "processor.h"
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#include "delay.h"
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#include "arch_timer.h"
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#include "gic.h"
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#include "vgic.h"
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#define NR_VCPUS_DEF 4
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#define NR_TEST_ITERS_DEF 5
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#define TIMER_TEST_PERIOD_MS_DEF 10
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#define TIMER_TEST_ERR_MARGIN_US 100
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struct test_args {
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int nr_vcpus;
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int nr_iter;
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int timer_period_ms;
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};
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static struct test_args test_args = {
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.nr_vcpus = NR_VCPUS_DEF,
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.nr_iter = NR_TEST_ITERS_DEF,
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.timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
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};
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#define msecs_to_usecs(msec) ((msec) * 1000LL)
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#define GICD_BASE_GPA 0x8000000ULL
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#define GICR_BASE_GPA 0x80A0000ULL
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enum guest_stage {
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GUEST_STAGE_VTIMER_CVAL = 1,
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GUEST_STAGE_VTIMER_TVAL,
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GUEST_STAGE_PTIMER_CVAL,
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GUEST_STAGE_PTIMER_TVAL,
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GUEST_STAGE_MAX,
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};
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/* Shared variables between host and guest */
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struct test_vcpu_shared_data {
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int nr_iter;
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enum guest_stage guest_stage;
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uint64_t xcnt;
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};
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struct test_vcpu {
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uint32_t vcpuid;
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pthread_t pt_vcpu_run;
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struct kvm_vm *vm;
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};
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static struct test_vcpu test_vcpu[KVM_MAX_VCPUS];
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static struct test_vcpu_shared_data vcpu_shared_data[KVM_MAX_VCPUS];
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static int vtimer_irq, ptimer_irq;
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static void
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guest_configure_timer_action(struct test_vcpu_shared_data *shared_data)
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{
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switch (shared_data->guest_stage) {
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case GUEST_STAGE_VTIMER_CVAL:
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timer_set_next_cval_ms(VIRTUAL, test_args.timer_period_ms);
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shared_data->xcnt = timer_get_cntct(VIRTUAL);
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timer_set_ctl(VIRTUAL, CTL_ENABLE);
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break;
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case GUEST_STAGE_VTIMER_TVAL:
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timer_set_next_tval_ms(VIRTUAL, test_args.timer_period_ms);
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shared_data->xcnt = timer_get_cntct(VIRTUAL);
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timer_set_ctl(VIRTUAL, CTL_ENABLE);
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break;
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case GUEST_STAGE_PTIMER_CVAL:
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timer_set_next_cval_ms(PHYSICAL, test_args.timer_period_ms);
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shared_data->xcnt = timer_get_cntct(PHYSICAL);
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timer_set_ctl(PHYSICAL, CTL_ENABLE);
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break;
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case GUEST_STAGE_PTIMER_TVAL:
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timer_set_next_tval_ms(PHYSICAL, test_args.timer_period_ms);
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shared_data->xcnt = timer_get_cntct(PHYSICAL);
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timer_set_ctl(PHYSICAL, CTL_ENABLE);
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break;
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default:
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GUEST_ASSERT(0);
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}
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}
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static void guest_validate_irq(unsigned int intid,
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struct test_vcpu_shared_data *shared_data)
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{
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enum guest_stage stage = shared_data->guest_stage;
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uint64_t xcnt = 0, xcnt_diff_us, cval = 0;
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unsigned long xctl = 0;
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unsigned int timer_irq = 0;
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if (stage == GUEST_STAGE_VTIMER_CVAL ||
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stage == GUEST_STAGE_VTIMER_TVAL) {
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xctl = timer_get_ctl(VIRTUAL);
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timer_set_ctl(VIRTUAL, CTL_IMASK);
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xcnt = timer_get_cntct(VIRTUAL);
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cval = timer_get_cval(VIRTUAL);
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timer_irq = vtimer_irq;
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} else if (stage == GUEST_STAGE_PTIMER_CVAL ||
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stage == GUEST_STAGE_PTIMER_TVAL) {
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xctl = timer_get_ctl(PHYSICAL);
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timer_set_ctl(PHYSICAL, CTL_IMASK);
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xcnt = timer_get_cntct(PHYSICAL);
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cval = timer_get_cval(PHYSICAL);
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timer_irq = ptimer_irq;
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} else {
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GUEST_ASSERT(0);
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}
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xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt);
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/* Make sure we are dealing with the correct timer IRQ */
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GUEST_ASSERT_2(intid == timer_irq, intid, timer_irq);
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/* Basic 'timer condition met' check */
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GUEST_ASSERT_3(xcnt >= cval, xcnt, cval, xcnt_diff_us);
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GUEST_ASSERT_1(xctl & CTL_ISTATUS, xctl);
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}
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static void guest_irq_handler(struct ex_regs *regs)
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{
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unsigned int intid = gic_get_and_ack_irq();
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uint32_t cpu = guest_get_vcpuid();
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struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
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guest_validate_irq(intid, shared_data);
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WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1);
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gic_set_eoi(intid);
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}
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static void guest_run_stage(struct test_vcpu_shared_data *shared_data,
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enum guest_stage stage)
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{
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uint32_t irq_iter, config_iter;
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shared_data->guest_stage = stage;
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shared_data->nr_iter = 0;
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for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
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/* Setup the next interrupt */
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guest_configure_timer_action(shared_data);
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/* Setup a timeout for the interrupt to arrive */
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udelay(msecs_to_usecs(test_args.timer_period_ms) +
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TIMER_TEST_ERR_MARGIN_US);
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irq_iter = READ_ONCE(shared_data->nr_iter);
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GUEST_ASSERT_2(config_iter + 1 == irq_iter,
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config_iter + 1, irq_iter);
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}
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}
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static void guest_code(void)
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{
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uint32_t cpu = guest_get_vcpuid();
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struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
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local_irq_disable();
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gic_init(GIC_V3, test_args.nr_vcpus,
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(void *)GICD_BASE_GPA, (void *)GICR_BASE_GPA);
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timer_set_ctl(VIRTUAL, CTL_IMASK);
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timer_set_ctl(PHYSICAL, CTL_IMASK);
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gic_irq_enable(vtimer_irq);
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gic_irq_enable(ptimer_irq);
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local_irq_enable();
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guest_run_stage(shared_data, GUEST_STAGE_VTIMER_CVAL);
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guest_run_stage(shared_data, GUEST_STAGE_VTIMER_TVAL);
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guest_run_stage(shared_data, GUEST_STAGE_PTIMER_CVAL);
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guest_run_stage(shared_data, GUEST_STAGE_PTIMER_TVAL);
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GUEST_DONE();
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}
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static void *test_vcpu_run(void *arg)
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{
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struct ucall uc;
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struct test_vcpu *vcpu = arg;
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struct kvm_vm *vm = vcpu->vm;
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uint32_t vcpuid = vcpu->vcpuid;
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struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[vcpuid];
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vcpu_run(vm, vcpuid);
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switch (get_ucall(vm, vcpuid, &uc)) {
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case UCALL_SYNC:
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case UCALL_DONE:
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break;
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case UCALL_ABORT:
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sync_global_from_guest(vm, *shared_data);
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TEST_FAIL("%s at %s:%ld\n\tvalues: %lu, %lu; %lu, vcpu: %u; stage: %u; iter: %u",
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(const char *)uc.args[0], __FILE__, uc.args[1],
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uc.args[2], uc.args[3], uc.args[4], vcpuid,
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shared_data->guest_stage, shared_data->nr_iter);
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break;
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default:
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TEST_FAIL("Unexpected guest exit\n");
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}
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return NULL;
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}
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static void test_run(struct kvm_vm *vm)
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{
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int i, ret;
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for (i = 0; i < test_args.nr_vcpus; i++) {
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ret = pthread_create(&test_vcpu[i].pt_vcpu_run, NULL,
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test_vcpu_run, &test_vcpu[i]);
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TEST_ASSERT(!ret, "Failed to create vCPU-%d pthread\n", i);
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}
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for (i = 0; i < test_args.nr_vcpus; i++)
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pthread_join(test_vcpu[i].pt_vcpu_run, NULL);
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}
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static void test_init_timer_irq(struct kvm_vm *vm)
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{
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/* Timer initid should be same for all the vCPUs, so query only vCPU-0 */
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int vcpu0_fd = vcpu_get_fd(vm, 0);
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kvm_device_access(vcpu0_fd, KVM_ARM_VCPU_TIMER_CTRL,
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KVM_ARM_VCPU_TIMER_IRQ_PTIMER, &ptimer_irq, false);
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kvm_device_access(vcpu0_fd, KVM_ARM_VCPU_TIMER_CTRL,
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KVM_ARM_VCPU_TIMER_IRQ_VTIMER, &vtimer_irq, false);
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sync_global_to_guest(vm, ptimer_irq);
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sync_global_to_guest(vm, vtimer_irq);
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pr_debug("ptimer_irq: %d; vtimer_irq: %d\n", ptimer_irq, vtimer_irq);
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}
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static struct kvm_vm *test_vm_create(void)
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{
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struct kvm_vm *vm;
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unsigned int i;
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int nr_vcpus = test_args.nr_vcpus;
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vm = vm_create_default_with_vcpus(nr_vcpus, 0, 0, guest_code, NULL);
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vm_init_descriptor_tables(vm);
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vm_install_exception_handler(vm, VECTOR_IRQ_CURRENT, guest_irq_handler);
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for (i = 0; i < nr_vcpus; i++) {
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vcpu_init_descriptor_tables(vm, i);
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test_vcpu[i].vcpuid = i;
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test_vcpu[i].vm = vm;
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}
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ucall_init(vm, NULL);
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test_init_timer_irq(vm);
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vgic_v3_setup(vm, nr_vcpus, GICD_BASE_GPA, GICR_BASE_GPA);
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/* Make all the test's cmdline args visible to the guest */
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sync_global_to_guest(vm, test_args);
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return vm;
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}
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static void test_print_help(char *name)
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{
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pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
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name);
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pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
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NR_VCPUS_DEF, KVM_MAX_VCPUS);
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pr_info("\t-i: Number of iterations per stage (default: %u)\n",
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NR_TEST_ITERS_DEF);
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pr_info("\t-p: Periodicity (in ms) of the guest timer (default: %u)\n",
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TIMER_TEST_PERIOD_MS_DEF);
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pr_info("\t-h: print this help screen\n");
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}
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static bool parse_args(int argc, char *argv[])
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{
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int opt;
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while ((opt = getopt(argc, argv, "hn:i:p:")) != -1) {
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switch (opt) {
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case 'n':
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test_args.nr_vcpus = atoi(optarg);
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if (test_args.nr_vcpus <= 0) {
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pr_info("Positive value needed for -n\n");
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goto err;
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} else if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
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pr_info("Max allowed vCPUs: %u\n",
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KVM_MAX_VCPUS);
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goto err;
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}
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break;
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case 'i':
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test_args.nr_iter = atoi(optarg);
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if (test_args.nr_iter <= 0) {
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pr_info("Positive value needed for -i\n");
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goto err;
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}
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break;
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case 'p':
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test_args.timer_period_ms = atoi(optarg);
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if (test_args.timer_period_ms <= 0) {
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pr_info("Positive value needed for -p\n");
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goto err;
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}
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break;
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case 'h':
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default:
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goto err;
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}
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}
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return true;
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err:
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test_print_help(argv[0]);
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return false;
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}
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int main(int argc, char *argv[])
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{
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struct kvm_vm *vm;
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/* Tell stdout not to buffer its content */
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setbuf(stdout, NULL);
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if (!parse_args(argc, argv))
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exit(KSFT_SKIP);
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vm = test_vm_create();
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test_run(vm);
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kvm_vm_free(vm);
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return 0;
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}
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