diff options
Diffstat (limited to 'tools/testing/selftests/kvm/steal_time.c')
| -rw-r--r-- | tools/testing/selftests/kvm/steal_time.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selftests/kvm/steal_time.c index 171adfb2a6cb..bae0c5026f82 100644 --- a/tools/testing/selftests/kvm/steal_time.c +++ b/tools/testing/selftests/kvm/steal_time.c @@ -11,7 +11,9 @@ #include <pthread.h> #include <linux/kernel.h> #include <asm/kvm.h> +#ifndef __riscv #include <asm/kvm_para.h> +#endif #include "test_util.h" #include "kvm_util.h" @@ -203,6 +205,103 @@ static void steal_time_dump(struct kvm_vm *vm, uint32_t vcpu_idx) pr_info(" st_time: %ld\n", st->st_time); } +#elif defined(__riscv) + +/* SBI STA shmem must have 64-byte alignment */ +#define STEAL_TIME_SIZE ((sizeof(struct sta_struct) + 63) & ~63) + +static vm_paddr_t st_gpa[NR_VCPUS]; + +struct sta_struct { + uint32_t sequence; + uint32_t flags; + uint64_t steal; + uint8_t preempted; + uint8_t pad[47]; +} __packed; + +static void sta_set_shmem(vm_paddr_t gpa, unsigned long flags) +{ + unsigned long lo = (unsigned long)gpa; +#if __riscv_xlen == 32 + unsigned long hi = (unsigned long)(gpa >> 32); +#else + unsigned long hi = gpa == -1 ? -1 : 0; +#endif + struct sbiret ret = sbi_ecall(SBI_EXT_STA, 0, lo, hi, flags, 0, 0, 0); + + GUEST_ASSERT(ret.value == 0 && ret.error == 0); +} + +static void check_status(struct sta_struct *st) +{ + GUEST_ASSERT(!(READ_ONCE(st->sequence) & 1)); + GUEST_ASSERT(READ_ONCE(st->flags) == 0); + GUEST_ASSERT(READ_ONCE(st->preempted) == 0); +} + +static void guest_code(int cpu) +{ + struct sta_struct *st = st_gva[cpu]; + uint32_t sequence; + long out_val = 0; + bool probe; + + probe = guest_sbi_probe_extension(SBI_EXT_STA, &out_val); + GUEST_ASSERT(probe && out_val == 1); + + sta_set_shmem(st_gpa[cpu], 0); + GUEST_SYNC(0); + + check_status(st); + WRITE_ONCE(guest_stolen_time[cpu], st->steal); + sequence = READ_ONCE(st->sequence); + check_status(st); + GUEST_SYNC(1); + + check_status(st); + GUEST_ASSERT(sequence < READ_ONCE(st->sequence)); + WRITE_ONCE(guest_stolen_time[cpu], st->steal); + check_status(st); + GUEST_DONE(); +} + +static bool is_steal_time_supported(struct kvm_vcpu *vcpu) +{ + uint64_t id = RISCV_SBI_EXT_REG(KVM_RISCV_SBI_EXT_STA); + unsigned long enabled; + + vcpu_get_reg(vcpu, id, &enabled); + TEST_ASSERT(enabled == 0 || enabled == 1, "Expected boolean result"); + + return enabled; +} + +static void steal_time_init(struct kvm_vcpu *vcpu, uint32_t i) +{ + /* ST_GPA_BASE is identity mapped */ + st_gva[i] = (void *)(ST_GPA_BASE + i * STEAL_TIME_SIZE); + st_gpa[i] = addr_gva2gpa(vcpu->vm, (vm_vaddr_t)st_gva[i]); + sync_global_to_guest(vcpu->vm, st_gva[i]); + sync_global_to_guest(vcpu->vm, st_gpa[i]); +} + +static void steal_time_dump(struct kvm_vm *vm, uint32_t vcpu_idx) +{ + struct sta_struct *st = addr_gva2hva(vm, (ulong)st_gva[vcpu_idx]); + int i; + + pr_info("VCPU%d:\n", vcpu_idx); + pr_info(" sequence: %d\n", st->sequence); + pr_info(" flags: %d\n", st->flags); + pr_info(" steal: %"PRIu64"\n", st->steal); + pr_info(" preempted: %d\n", st->preempted); + pr_info(" pad: "); + for (i = 0; i < 47; ++i) + pr_info("%d", st->pad[i]); + pr_info("\n"); +} + #endif static void *do_steal_time(void *arg) |