diff options
Diffstat (limited to 'tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c')
| -rw-r--r-- | tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c | 1020 |
1 files changed, 1020 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c new file mode 100644 index 000000000000..2a5727188c8d --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c @@ -0,0 +1,1020 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * svm_vmcall_test + * + * Copyright © 2021 Amazon.com, Inc. or its affiliates. + * + * Xen shared_info / pvclock testing + */ + +#include "test_util.h" +#include "kvm_util.h" +#include "processor.h" + +#include <stdint.h> +#include <time.h> +#include <sched.h> +#include <signal.h> +#include <pthread.h> + +#include <sys/eventfd.h> + +/* Defined in include/linux/kvm_types.h */ +#define GPA_INVALID (~(ulong)0) + +#define SHINFO_REGION_GVA 0xc0000000ULL +#define SHINFO_REGION_GPA 0xc0000000ULL +#define SHINFO_REGION_SLOT 10 + +#define DUMMY_REGION_GPA (SHINFO_REGION_GPA + (2 * PAGE_SIZE)) +#define DUMMY_REGION_SLOT 11 + +#define SHINFO_ADDR (SHINFO_REGION_GPA) +#define PVTIME_ADDR (SHINFO_REGION_GPA + PAGE_SIZE) +#define RUNSTATE_ADDR (SHINFO_REGION_GPA + PAGE_SIZE + 0x20) +#define VCPU_INFO_ADDR (SHINFO_REGION_GPA + 0x40) + +#define SHINFO_VADDR (SHINFO_REGION_GVA) +#define RUNSTATE_VADDR (SHINFO_REGION_GVA + PAGE_SIZE + 0x20) +#define VCPU_INFO_VADDR (SHINFO_REGION_GVA + 0x40) + +#define EVTCHN_VECTOR 0x10 + +#define EVTCHN_TEST1 15 +#define EVTCHN_TEST2 66 +#define EVTCHN_TIMER 13 + +#define XEN_HYPERCALL_MSR 0x40000000 + +#define MIN_STEAL_TIME 50000 + +#define SHINFO_RACE_TIMEOUT 2 /* seconds */ + +#define __HYPERVISOR_set_timer_op 15 +#define __HYPERVISOR_sched_op 29 +#define __HYPERVISOR_event_channel_op 32 + +#define SCHEDOP_poll 3 + +#define EVTCHNOP_send 4 + +#define EVTCHNSTAT_interdomain 2 + +struct evtchn_send { + u32 port; +}; + +struct sched_poll { + u32 *ports; + unsigned int nr_ports; + u64 timeout; +}; + +struct pvclock_vcpu_time_info { + u32 version; + u32 pad0; + u64 tsc_timestamp; + u64 system_time; + u32 tsc_to_system_mul; + s8 tsc_shift; + u8 flags; + u8 pad[2]; +} __attribute__((__packed__)); /* 32 bytes */ + +struct pvclock_wall_clock { + u32 version; + u32 sec; + u32 nsec; +} __attribute__((__packed__)); + +struct vcpu_runstate_info { + uint32_t state; + uint64_t state_entry_time; + uint64_t time[4]; +}; + +struct arch_vcpu_info { + unsigned long cr2; + unsigned long pad; /* sizeof(vcpu_info_t) == 64 */ +}; + +struct vcpu_info { + uint8_t evtchn_upcall_pending; + uint8_t evtchn_upcall_mask; + unsigned long evtchn_pending_sel; + struct arch_vcpu_info arch; + struct pvclock_vcpu_time_info time; +}; /* 64 bytes (x86) */ + +struct shared_info { + struct vcpu_info vcpu_info[32]; + unsigned long evtchn_pending[64]; + unsigned long evtchn_mask[64]; + struct pvclock_wall_clock wc; + uint32_t wc_sec_hi; + /* arch_shared_info here */ +}; + +#define RUNSTATE_running 0 +#define RUNSTATE_runnable 1 +#define RUNSTATE_blocked 2 +#define RUNSTATE_offline 3 + +static const char *runstate_names[] = { + "running", + "runnable", + "blocked", + "offline" +}; + +struct { + struct kvm_irq_routing info; + struct kvm_irq_routing_entry entries[2]; +} irq_routes; + +static volatile bool guest_saw_irq; + +static void evtchn_handler(struct ex_regs *regs) +{ + struct vcpu_info *vi = (void *)VCPU_INFO_VADDR; + vi->evtchn_upcall_pending = 0; + vi->evtchn_pending_sel = 0; + guest_saw_irq = true; + + GUEST_SYNC(0x20); +} + +static void guest_wait_for_irq(void) +{ + while (!guest_saw_irq) + __asm__ __volatile__ ("rep nop" : : : "memory"); + guest_saw_irq = false; +} + +static void guest_code(void) +{ + struct vcpu_runstate_info *rs = (void *)RUNSTATE_VADDR; + int i; + + __asm__ __volatile__( + "sti\n" + "nop\n" + ); + + /* Trigger an interrupt injection */ + GUEST_SYNC(0); + + guest_wait_for_irq(); + + /* Test having the host set runstates manually */ + GUEST_SYNC(RUNSTATE_runnable); + GUEST_ASSERT(rs->time[RUNSTATE_runnable] != 0); + GUEST_ASSERT(rs->state == 0); + + GUEST_SYNC(RUNSTATE_blocked); + GUEST_ASSERT(rs->time[RUNSTATE_blocked] != 0); + GUEST_ASSERT(rs->state == 0); + + GUEST_SYNC(RUNSTATE_offline); + GUEST_ASSERT(rs->time[RUNSTATE_offline] != 0); + GUEST_ASSERT(rs->state == 0); + + /* Test runstate time adjust */ + GUEST_SYNC(4); + GUEST_ASSERT(rs->time[RUNSTATE_blocked] == 0x5a); + GUEST_ASSERT(rs->time[RUNSTATE_offline] == 0x6b6b); + + /* Test runstate time set */ + GUEST_SYNC(5); + GUEST_ASSERT(rs->state_entry_time >= 0x8000); + GUEST_ASSERT(rs->time[RUNSTATE_runnable] == 0); + GUEST_ASSERT(rs->time[RUNSTATE_blocked] == 0x6b6b); + GUEST_ASSERT(rs->time[RUNSTATE_offline] == 0x5a); + + /* sched_yield() should result in some 'runnable' time */ + GUEST_SYNC(6); + GUEST_ASSERT(rs->time[RUNSTATE_runnable] >= MIN_STEAL_TIME); + + /* Attempt to deliver a *masked* interrupt */ + GUEST_SYNC(7); + + /* Wait until we see the bit set */ + struct shared_info *si = (void *)SHINFO_VADDR; + while (!si->evtchn_pending[0]) + __asm__ __volatile__ ("rep nop" : : : "memory"); + + /* Now deliver an *unmasked* interrupt */ + GUEST_SYNC(8); + + guest_wait_for_irq(); + + /* Change memslots and deliver an interrupt */ + GUEST_SYNC(9); + + guest_wait_for_irq(); + + /* Deliver event channel with KVM_XEN_HVM_EVTCHN_SEND */ + GUEST_SYNC(10); + + guest_wait_for_irq(); + + GUEST_SYNC(11); + + /* Our turn. Deliver event channel (to ourselves) with + * EVTCHNOP_send hypercall. */ + unsigned long rax; + struct evtchn_send s = { .port = 127 }; + __asm__ __volatile__ ("vmcall" : + "=a" (rax) : + "a" (__HYPERVISOR_event_channel_op), + "D" (EVTCHNOP_send), + "S" (&s)); + + GUEST_ASSERT(rax == 0); + + guest_wait_for_irq(); + + GUEST_SYNC(12); + + /* Deliver "outbound" event channel to an eventfd which + * happens to be one of our own irqfds. */ + s.port = 197; + __asm__ __volatile__ ("vmcall" : + "=a" (rax) : + "a" (__HYPERVISOR_event_channel_op), + "D" (EVTCHNOP_send), + "S" (&s)); + + GUEST_ASSERT(rax == 0); + + guest_wait_for_irq(); + + GUEST_SYNC(13); + + /* Set a timer 100ms in the future. */ + __asm__ __volatile__ ("vmcall" : + "=a" (rax) : + "a" (__HYPERVISOR_set_timer_op), + "D" (rs->state_entry_time + 100000000)); + GUEST_ASSERT(rax == 0); + + GUEST_SYNC(14); + + /* Now wait for the timer */ + guest_wait_for_irq(); + + GUEST_SYNC(15); + + /* The host has 'restored' the timer. Just wait for it. */ + guest_wait_for_irq(); + + GUEST_SYNC(16); + + /* Poll for an event channel port which is already set */ + u32 ports[1] = { EVTCHN_TIMER }; + struct sched_poll p = { + .ports = ports, + .nr_ports = 1, + .timeout = 0, + }; + + __asm__ __volatile__ ("vmcall" : + "=a" (rax) : + "a" (__HYPERVISOR_sched_op), + "D" (SCHEDOP_poll), + "S" (&p)); + + GUEST_ASSERT(rax == 0); + + GUEST_SYNC(17); + + /* Poll for an unset port and wait for the timeout. */ + p.timeout = 100000000; + __asm__ __volatile__ ("vmcall" : + "=a" (rax) : + "a" (__HYPERVISOR_sched_op), + "D" (SCHEDOP_poll), + "S" (&p)); + + GUEST_ASSERT(rax == 0); + + GUEST_SYNC(18); + + /* A timer will wake the masked port we're waiting on, while we poll */ + p.timeout = 0; + __asm__ __volatile__ ("vmcall" : + "=a" (rax) : + "a" (__HYPERVISOR_sched_op), + "D" (SCHEDOP_poll), + "S" (&p)); + + GUEST_ASSERT(rax == 0); + + GUEST_SYNC(19); + + /* A timer wake an *unmasked* port which should wake us with an + * actual interrupt, while we're polling on a different port. */ + ports[0]++; + p.timeout = 0; + __asm__ __volatile__ ("vmcall" : + "=a" (rax) : + "a" (__HYPERVISOR_sched_op), + "D" (SCHEDOP_poll), + "S" (&p)); + + GUEST_ASSERT(rax == 0); + + guest_wait_for_irq(); + + GUEST_SYNC(20); + + /* Timer should have fired already */ + guest_wait_for_irq(); + + GUEST_SYNC(21); + /* Racing host ioctls */ + + guest_wait_for_irq(); + + GUEST_SYNC(22); + /* Racing vmcall against host ioctl */ + + ports[0] = 0; + + p = (struct sched_poll) { + .ports = ports, + .nr_ports = 1, + .timeout = 0 + }; + +wait_for_timer: + /* + * Poll for a timer wake event while the worker thread is mucking with + * the shared info. KVM XEN drops timer IRQs if the shared info is + * invalid when the timer expires. Arbitrarily poll 100 times before + * giving up and asking the VMM to re-arm the timer. 100 polls should + * consume enough time to beat on KVM without taking too long if the + * timer IRQ is dropped due to an invalid event channel. + */ + for (i = 0; i < 100 && !guest_saw_irq; i++) + asm volatile("vmcall" + : "=a" (rax) + : "a" (__HYPERVISOR_sched_op), + "D" (SCHEDOP_poll), + "S" (&p) + : "memory"); + + /* + * Re-send the timer IRQ if it was (likely) dropped due to the timer + * expiring while the event channel was invalid. + */ + if (!guest_saw_irq) { + GUEST_SYNC(23); + goto wait_for_timer; + } + guest_saw_irq = false; + + GUEST_SYNC(24); +} + +static int cmp_timespec(struct timespec *a, struct timespec *b) +{ + if (a->tv_sec > b->tv_sec) + return 1; + else if (a->tv_sec < b->tv_sec) + return -1; + else if (a->tv_nsec > b->tv_nsec) + return 1; + else if (a->tv_nsec < b->tv_nsec) + return -1; + else + return 0; +} + +static struct vcpu_info *vinfo; +static struct kvm_vcpu *vcpu; + +static void handle_alrm(int sig) +{ + if (vinfo) + printf("evtchn_upcall_pending 0x%x\n", vinfo->evtchn_upcall_pending); + vcpu_dump(stdout, vcpu, 0); + TEST_FAIL("IRQ delivery timed out"); +} + +static void *juggle_shinfo_state(void *arg) +{ + struct kvm_vm *vm = (struct kvm_vm *)arg; + + struct kvm_xen_hvm_attr cache_init = { + .type = KVM_XEN_ATTR_TYPE_SHARED_INFO, + .u.shared_info.gfn = SHINFO_REGION_GPA / PAGE_SIZE + }; + + struct kvm_xen_hvm_attr cache_destroy = { + .type = KVM_XEN_ATTR_TYPE_SHARED_INFO, + .u.shared_info.gfn = GPA_INVALID + }; + + for (;;) { + __vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &cache_init); + __vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &cache_destroy); + pthread_testcancel(); + }; + + return NULL; +} + +int main(int argc, char *argv[]) +{ + struct timespec min_ts, max_ts, vm_ts; + struct kvm_vm *vm; + pthread_t thread; + bool verbose; + int ret; + + verbose = argc > 1 && (!strncmp(argv[1], "-v", 3) || + !strncmp(argv[1], "--verbose", 10)); + + int xen_caps = kvm_check_cap(KVM_CAP_XEN_HVM); + TEST_REQUIRE(xen_caps & KVM_XEN_HVM_CONFIG_SHARED_INFO); + + bool do_runstate_tests = !!(xen_caps & KVM_XEN_HVM_CONFIG_RUNSTATE); + bool do_eventfd_tests = !!(xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL); + bool do_evtchn_tests = do_eventfd_tests && !!(xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_SEND); + + clock_gettime(CLOCK_REALTIME, &min_ts); + + vm = vm_create_with_one_vcpu(&vcpu, guest_code); + + /* Map a region for the shared_info page */ + vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, + SHINFO_REGION_GPA, SHINFO_REGION_SLOT, 2, 0); + virt_map(vm, SHINFO_REGION_GVA, SHINFO_REGION_GPA, 2); + + struct shared_info *shinfo = addr_gpa2hva(vm, SHINFO_VADDR); + + int zero_fd = open("/dev/zero", O_RDONLY); + TEST_ASSERT(zero_fd != -1, "Failed to open /dev/zero"); + + struct kvm_xen_hvm_config hvmc = { + .flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL, + .msr = XEN_HYPERCALL_MSR, + }; + + /* Let the kernel know that we *will* use it for sending all + * event channels, which lets it intercept SCHEDOP_poll */ + if (do_evtchn_tests) + hvmc.flags |= KVM_XEN_HVM_CONFIG_EVTCHN_SEND; + + vm_ioctl(vm, KVM_XEN_HVM_CONFIG, &hvmc); + + struct kvm_xen_hvm_attr lm = { + .type = KVM_XEN_ATTR_TYPE_LONG_MODE, + .u.long_mode = 1, + }; + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &lm); + + struct kvm_xen_hvm_attr ha = { + .type = KVM_XEN_ATTR_TYPE_SHARED_INFO, + .u.shared_info.gfn = SHINFO_REGION_GPA / PAGE_SIZE, + }; + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &ha); + + /* + * Test what happens when the HVA of the shinfo page is remapped after + * the kernel has a reference to it. But make sure we copy the clock + * info over since that's only set at setup time, and we test it later. + */ + struct pvclock_wall_clock wc_copy = shinfo->wc; + void *m = mmap(shinfo, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_PRIVATE, zero_fd, 0); + TEST_ASSERT(m == shinfo, "Failed to map /dev/zero over shared info"); + shinfo->wc = wc_copy; + + struct kvm_xen_vcpu_attr vi = { + .type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO, + .u.gpa = VCPU_INFO_ADDR, + }; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &vi); + + struct kvm_xen_vcpu_attr pvclock = { + .type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO, + .u.gpa = PVTIME_ADDR, + }; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &pvclock); + + struct kvm_xen_hvm_attr vec = { + .type = KVM_XEN_ATTR_TYPE_UPCALL_VECTOR, + .u.vector = EVTCHN_VECTOR, + }; + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &vec); + + vm_init_descriptor_tables(vm); + vcpu_init_descriptor_tables(vcpu); + vm_install_exception_handler(vm, EVTCHN_VECTOR, evtchn_handler); + + if (do_runstate_tests) { + struct kvm_xen_vcpu_attr st = { + .type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR, + .u.gpa = RUNSTATE_ADDR, + }; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &st); + } + + int irq_fd[2] = { -1, -1 }; + + if (do_eventfd_tests) { + irq_fd[0] = eventfd(0, 0); + irq_fd[1] = eventfd(0, 0); + + /* Unexpected, but not a KVM failure */ + if (irq_fd[0] == -1 || irq_fd[1] == -1) + do_evtchn_tests = do_eventfd_tests = false; + } + + if (do_eventfd_tests) { + irq_routes.info.nr = 2; + + irq_routes.entries[0].gsi = 32; + irq_routes.entries[0].type = KVM_IRQ_ROUTING_XEN_EVTCHN; + irq_routes.entries[0].u.xen_evtchn.port = EVTCHN_TEST1; + irq_routes.entries[0].u.xen_evtchn.vcpu = vcpu->id; + irq_routes.entries[0].u.xen_evtchn.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL; + + irq_routes.entries[1].gsi = 33; + irq_routes.entries[1].type = KVM_IRQ_ROUTING_XEN_EVTCHN; + irq_routes.entries[1].u.xen_evtchn.port = EVTCHN_TEST2; + irq_routes.entries[1].u.xen_evtchn.vcpu = vcpu->id; + irq_routes.entries[1].u.xen_evtchn.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL; + + vm_ioctl(vm, KVM_SET_GSI_ROUTING, &irq_routes.info); + + struct kvm_irqfd ifd = { }; + + ifd.fd = irq_fd[0]; + ifd.gsi = 32; + vm_ioctl(vm, KVM_IRQFD, &ifd); + + ifd.fd = irq_fd[1]; + ifd.gsi = 33; + vm_ioctl(vm, KVM_IRQFD, &ifd); + + struct sigaction sa = { }; + sa.sa_handler = handle_alrm; + sigaction(SIGALRM, &sa, NULL); + } + + struct kvm_xen_vcpu_attr tmr = { + .type = KVM_XEN_VCPU_ATTR_TYPE_TIMER, + .u.timer.port = EVTCHN_TIMER, + .u.timer.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL, + .u.timer.expires_ns = 0 + }; + + if (do_evtchn_tests) { + struct kvm_xen_hvm_attr inj = { + .type = KVM_XEN_ATTR_TYPE_EVTCHN, + .u.evtchn.send_port = 127, + .u.evtchn.type = EVTCHNSTAT_interdomain, + .u.evtchn.flags = 0, + .u.evtchn.deliver.port.port = EVTCHN_TEST1, + .u.evtchn.deliver.port.vcpu = vcpu->id + 1, + .u.evtchn.deliver.port.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL, + }; + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &inj); + + /* Test migration to a different vCPU */ + inj.u.evtchn.flags = KVM_XEN_EVTCHN_UPDATE; + inj.u.evtchn.deliver.port.vcpu = vcpu->id; + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &inj); + + inj.u.evtchn.send_port = 197; + inj.u.evtchn.deliver.eventfd.port = 0; + inj.u.evtchn.deliver.eventfd.fd = irq_fd[1]; + inj.u.evtchn.flags = 0; + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &inj); + + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr); + } + vinfo = addr_gpa2hva(vm, VCPU_INFO_VADDR); + vinfo->evtchn_upcall_pending = 0; + + struct vcpu_runstate_info *rs = addr_gpa2hva(vm, RUNSTATE_ADDR); + rs->state = 0x5a; + + bool evtchn_irq_expected = false; + + for (;;) { + volatile struct kvm_run *run = vcpu->run; + struct ucall uc; + + vcpu_run(vcpu); + + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, + "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n", + run->exit_reason, + exit_reason_str(run->exit_reason)); + + switch (get_ucall(vcpu, &uc)) { + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + /* NOT REACHED */ + case UCALL_SYNC: { + struct kvm_xen_vcpu_attr rst; + long rundelay; + + if (do_runstate_tests) + TEST_ASSERT(rs->state_entry_time == rs->time[0] + + rs->time[1] + rs->time[2] + rs->time[3], + "runstate times don't add up"); + + switch (uc.args[1]) { + case 0: + if (verbose) + printf("Delivering evtchn upcall\n"); + evtchn_irq_expected = true; + vinfo->evtchn_upcall_pending = 1; + break; + + case RUNSTATE_runnable...RUNSTATE_offline: + TEST_ASSERT(!evtchn_irq_expected, "Event channel IRQ not seen"); + if (!do_runstate_tests) + goto done; + if (verbose) + printf("Testing runstate %s\n", runstate_names[uc.args[1]]); + rst.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT; + rst.u.runstate.state = uc.args[1]; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &rst); + break; + + case 4: + if (verbose) + printf("Testing RUNSTATE_ADJUST\n"); + rst.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST; + memset(&rst.u, 0, sizeof(rst.u)); + rst.u.runstate.state = (uint64_t)-1; + rst.u.runstate.time_blocked = + 0x5a - rs->time[RUNSTATE_blocked]; + rst.u.runstate.time_offline = + 0x6b6b - rs->time[RUNSTATE_offline]; + rst.u.runstate.time_runnable = -rst.u.runstate.time_blocked - + rst.u.runstate.time_offline; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &rst); + break; + + case 5: + if (verbose) + printf("Testing RUNSTATE_DATA\n"); + rst.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA; + memset(&rst.u, 0, sizeof(rst.u)); + rst.u.runstate.state = RUNSTATE_running; + rst.u.runstate.state_entry_time = 0x6b6b + 0x5a; + rst.u.runstate.time_blocked = 0x6b6b; + rst.u.runstate.time_offline = 0x5a; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &rst); + break; + + case 6: + if (verbose) + printf("Testing steal time\n"); + /* Yield until scheduler delay exceeds target */ + rundelay = get_run_delay() + MIN_STEAL_TIME; + do { + sched_yield(); + } while (get_run_delay() < rundelay); + break; + + case 7: + if (!do_eventfd_tests) + goto done; + if (verbose) + printf("Testing masked event channel\n"); + shinfo->evtchn_mask[0] = 1UL << EVTCHN_TEST1; + eventfd_write(irq_fd[0], 1UL); + alarm(1); + break; + + case 8: + if (verbose) + printf("Testing unmasked event channel\n"); + /* Unmask that, but deliver the other one */ + shinfo->evtchn_pending[0] = 0; + shinfo->evtchn_mask[0] = 0; + eventfd_write(irq_fd[1], 1UL); + evtchn_irq_expected = true; + alarm(1); + break; + + case 9: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + shinfo->evtchn_pending[1] = 0; + if (verbose) + printf("Testing event channel after memslot change\n"); + vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, + DUMMY_REGION_GPA, DUMMY_REGION_SLOT, 1, 0); + eventfd_write(irq_fd[0], 1UL); + evtchn_irq_expected = true; + alarm(1); + break; + + case 10: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + if (!do_evtchn_tests) + goto done; + + shinfo->evtchn_pending[0] = 0; + if (verbose) + printf("Testing injection with KVM_XEN_HVM_EVTCHN_SEND\n"); + + struct kvm_irq_routing_xen_evtchn e; + e.port = EVTCHN_TEST2; + e.vcpu = vcpu->id; + e.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL; + + vm_ioctl(vm, KVM_XEN_HVM_EVTCHN_SEND, &e); + evtchn_irq_expected = true; + alarm(1); + break; + + case 11: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + shinfo->evtchn_pending[1] = 0; + + if (verbose) + printf("Testing guest EVTCHNOP_send direct to evtchn\n"); + evtchn_irq_expected = true; + alarm(1); + break; + + case 12: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + shinfo->evtchn_pending[0] = 0; + + if (verbose) + printf("Testing guest EVTCHNOP_send to eventfd\n"); + evtchn_irq_expected = true; + alarm(1); + break; + + case 13: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + shinfo->evtchn_pending[1] = 0; + + if (verbose) + printf("Testing guest oneshot timer\n"); + break; + + case 14: + memset(&tmr, 0, sizeof(tmr)); + tmr.type = KVM_XEN_VCPU_ATTR_TYPE_TIMER; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &tmr); + TEST_ASSERT(tmr.u.timer.port == EVTCHN_TIMER, + "Timer port not returned"); + TEST_ASSERT(tmr.u.timer.priority == KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL, + "Timer priority not returned"); + TEST_ASSERT(tmr.u.timer.expires_ns > rs->state_entry_time, + "Timer expiry not returned"); + evtchn_irq_expected = true; + alarm(1); + break; + + case 15: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + shinfo->evtchn_pending[0] = 0; + + if (verbose) + printf("Testing restored oneshot timer\n"); + + tmr.u.timer.expires_ns = rs->state_entry_time + 100000000; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr); + evtchn_irq_expected = true; + alarm(1); + break; + + case 16: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + + if (verbose) + printf("Testing SCHEDOP_poll with already pending event\n"); + shinfo->evtchn_pending[0] = shinfo->evtchn_mask[0] = 1UL << EVTCHN_TIMER; + alarm(1); + break; + + case 17: + if (verbose) + printf("Testing SCHEDOP_poll timeout\n"); + shinfo->evtchn_pending[0] = 0; + alarm(1); + break; + + case 18: + if (verbose) + printf("Testing SCHEDOP_poll wake on masked event\n"); + + tmr.u.timer.expires_ns = rs->state_entry_time + 100000000; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr); + alarm(1); + break; + + case 19: + shinfo->evtchn_pending[0] = shinfo->evtchn_mask[0] = 0; + if (verbose) + printf("Testing SCHEDOP_poll wake on unmasked event\n"); + + evtchn_irq_expected = true; + tmr.u.timer.expires_ns = rs->state_entry_time + 100000000; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr); + + /* Read it back and check the pending time is reported correctly */ + tmr.u.timer.expires_ns = 0; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &tmr); + TEST_ASSERT(tmr.u.timer.expires_ns == rs->state_entry_time + 100000000, + "Timer not reported pending"); + alarm(1); + break; + + case 20: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + /* Read timer and check it is no longer pending */ + vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &tmr); + TEST_ASSERT(!tmr.u.timer.expires_ns, "Timer still reported pending"); + + shinfo->evtchn_pending[0] = 0; + if (verbose) + printf("Testing timer in the past\n"); + + evtchn_irq_expected = true; + tmr.u.timer.expires_ns = rs->state_entry_time - 100000000ULL; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr); + alarm(1); + break; + + case 21: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + alarm(0); + + if (verbose) + printf("Testing shinfo lock corruption (KVM_XEN_HVM_EVTCHN_SEND)\n"); + + ret = pthread_create(&thread, NULL, &juggle_shinfo_state, (void *)vm); + TEST_ASSERT(ret == 0, "pthread_create() failed: %s", strerror(ret)); + + struct kvm_irq_routing_xen_evtchn uxe = { + .port = 1, + .vcpu = vcpu->id, + .priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL + }; + + evtchn_irq_expected = true; + for (time_t t = time(NULL) + SHINFO_RACE_TIMEOUT; time(NULL) < t;) + __vm_ioctl(vm, KVM_XEN_HVM_EVTCHN_SEND, &uxe); + break; + + case 22: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + + if (verbose) + printf("Testing shinfo lock corruption (SCHEDOP_poll)\n"); + + shinfo->evtchn_pending[0] = 1; + + evtchn_irq_expected = true; + tmr.u.timer.expires_ns = rs->state_entry_time + + SHINFO_RACE_TIMEOUT * 1000000000ULL; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr); + break; + + case 23: + /* + * Optional and possibly repeated sync point. + * Injecting the timer IRQ may fail if the + * shinfo is invalid when the timer expires. + * If the timer has expired but the IRQ hasn't + * been delivered, rearm the timer and retry. + */ + vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &tmr); + + /* Resume the guest if the timer is still pending. */ + if (tmr.u.timer.expires_ns) + break; + + /* All done if the IRQ was delivered. */ + if (!evtchn_irq_expected) + break; + + tmr.u.timer.expires_ns = rs->state_entry_time + + SHINFO_RACE_TIMEOUT * 1000000000ULL; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr); + break; + case 24: + TEST_ASSERT(!evtchn_irq_expected, + "Expected event channel IRQ but it didn't happen"); + + ret = pthread_cancel(thread); + TEST_ASSERT(ret == 0, "pthread_cancel() failed: %s", strerror(ret)); + + ret = pthread_join(thread, 0); + TEST_ASSERT(ret == 0, "pthread_join() failed: %s", strerror(ret)); + goto done; + + case 0x20: + TEST_ASSERT(evtchn_irq_expected, "Unexpected event channel IRQ"); + evtchn_irq_expected = false; + break; + } + break; + } + case UCALL_DONE: + goto done; + default: + TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd); + } + } + + done: + alarm(0); + clock_gettime(CLOCK_REALTIME, &max_ts); + + /* + * Just a *really* basic check that things are being put in the + * right place. The actual calculations are much the same for + * Xen as they are for the KVM variants, so no need to check. + */ + struct pvclock_wall_clock *wc; + struct pvclock_vcpu_time_info *ti, *ti2; + + wc = addr_gpa2hva(vm, SHINFO_REGION_GPA + 0xc00); + ti = addr_gpa2hva(vm, SHINFO_REGION_GPA + 0x40 + 0x20); + ti2 = addr_gpa2hva(vm, PVTIME_ADDR); + + if (verbose) { + printf("Wall clock (v %d) %d.%09d\n", wc->version, wc->sec, wc->nsec); + printf("Time info 1: v %u tsc %" PRIu64 " time %" PRIu64 " mul %u shift %u flags %x\n", + ti->version, ti->tsc_timestamp, ti->system_time, ti->tsc_to_system_mul, + ti->tsc_shift, ti->flags); + printf("Time info 2: v %u tsc %" PRIu64 " time %" PRIu64 " mul %u shift %u flags %x\n", + ti2->version, ti2->tsc_timestamp, ti2->system_time, ti2->tsc_to_system_mul, + ti2->tsc_shift, ti2->flags); + } + + vm_ts.tv_sec = wc->sec; + vm_ts.tv_nsec = wc->nsec; + TEST_ASSERT(wc->version && !(wc->version & 1), + "Bad wallclock version %x", wc->version); + TEST_ASSERT(cmp_timespec(&min_ts, &vm_ts) <= 0, "VM time too old"); + TEST_ASSERT(cmp_timespec(&max_ts, &vm_ts) >= 0, "VM time too new"); + + TEST_ASSERT(ti->version && !(ti->version & 1), + "Bad time_info version %x", ti->version); + TEST_ASSERT(ti2->version && !(ti2->version & 1), + "Bad time_info version %x", ti->version); + + if (do_runstate_tests) { + /* + * Fetch runstate and check sanity. Strictly speaking in the + * general case we might not expect the numbers to be identical + * but in this case we know we aren't running the vCPU any more. + */ + struct kvm_xen_vcpu_attr rst = { + .type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA, + }; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &rst); + + if (verbose) { + printf("Runstate: %s(%d), entry %" PRIu64 " ns\n", + rs->state <= RUNSTATE_offline ? runstate_names[rs->state] : "unknown", + rs->state, rs->state_entry_time); + for (int i = RUNSTATE_running; i <= RUNSTATE_offline; i++) { + printf("State %s: %" PRIu64 " ns\n", + runstate_names[i], rs->time[i]); + } + } + TEST_ASSERT(rs->state == rst.u.runstate.state, "Runstate mismatch"); + TEST_ASSERT(rs->state_entry_time == rst.u.runstate.state_entry_time, + "State entry time mismatch"); + TEST_ASSERT(rs->time[RUNSTATE_running] == rst.u.runstate.time_running, + "Running time mismatch"); + TEST_ASSERT(rs->time[RUNSTATE_runnable] == rst.u.runstate.time_runnable, + "Runnable time mismatch"); + TEST_ASSERT(rs->time[RUNSTATE_blocked] == rst.u.runstate.time_blocked, + "Blocked time mismatch"); + TEST_ASSERT(rs->time[RUNSTATE_offline] == rst.u.runstate.time_offline, + "Offline time mismatch"); + + TEST_ASSERT(rs->state_entry_time == rs->time[0] + + rs->time[1] + rs->time[2] + rs->time[3], + "runstate times don't add up"); + } + kvm_vm_free(vm); + return 0; +} |