On 7/23/20 6:09 PM, Dr. David Alan Gilbert (git) wrote: > From: "Dr. David Alan Gilbert" <[email protected]> > > Clean up the error handling in kvm_init_vcpu so we can see what went > wrong more easily. > > Make it take an Error ** and fill it out with what failed, including > the cpu id, so you can tell if it only fails at a given ID. > > Replace the remaining DPRINTF by a trace. > > This turns a: > kvm_init_vcpu failed: Invalid argument > > into: > kvm_init_vcpu: kvm_get_vcpu failed (256): Invalid argument > > and with the trace you then get to see: > > [email protected]:kvm_init_vcpu index: 169 id: 212 > [email protected]:kvm_init_vcpu index: 170 id: 256 > qemu-system-x86_64: kvm_init_vcpu: kvm_get_vcpu failed (256): Invalid argument > > which makes stuff a lot more obvious. > > Signed-off-by: Dr. David Alan Gilbert <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]> > --- > accel/kvm/kvm-all.c | 19 ++++++++++++++----- > accel/kvm/trace-events | 1 + > accel/stubs/kvm-stub.c | 2 +- > include/sysemu/kvm.h | 2 +- > softmmu/cpus.c | 6 +----- > 5 files changed, 18 insertions(+), 12 deletions(-) > > diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c > index 63ef6af9a1c..0fbece977c7 100644 > --- a/accel/kvm/kvm-all.c > +++ b/accel/kvm/kvm-all.c > @@ -430,17 +430,18 @@ static int kvm_get_vcpu(KVMState *s, unsigned long > vcpu_id) > return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id); > } > > -int kvm_init_vcpu(CPUState *cpu) > +int kvm_init_vcpu(CPUState *cpu, Error **errp) > { > KVMState *s = kvm_state; > long mmap_size; > int ret; > > - DPRINTF("kvm_init_vcpu\n"); > + trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu)); > > ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu)); > if (ret < 0) { > - DPRINTF("kvm_create_vcpu failed\n"); > + error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_get_vcpu failed > (%lu)", > + kvm_arch_vcpu_id(cpu)); > goto err; > } > > @@ -451,7 +452,8 @@ int kvm_init_vcpu(CPUState *cpu) > mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); > if (mmap_size < 0) { > ret = mmap_size; > - DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n"); > + error_setg_errno(errp, -mmap_size, > + "kvm_init_vcpu: KVM_GET_VCPU_MMAP_SIZE failed"); > goto err; > } > > @@ -459,7 +461,9 @@ int kvm_init_vcpu(CPUState *cpu) > cpu->kvm_fd, 0); > if (cpu->kvm_run == MAP_FAILED) { > ret = -errno; > - DPRINTF("mmap'ing vcpu state failed\n"); > + error_setg_errno(errp, ret, > + "kvm_init_vcpu: mmap'ing vcpu state failed (%lu)", > + kvm_arch_vcpu_id(cpu)); > goto err; > } > > @@ -469,6 +473,11 @@ int kvm_init_vcpu(CPUState *cpu) > } > > ret = kvm_arch_init_vcpu(cpu); > + if (ret < 0) { > + error_setg_errno(errp, -ret, > + "kvm_init_vcpu: kvm_arch_init_vcpu failed (%lu)", > + kvm_arch_vcpu_id(cpu)); > + } > err: > return ret; > } > diff --git a/accel/kvm/trace-events b/accel/kvm/trace-events > index a68eb665343..e15ae8980d3 100644 > --- a/accel/kvm/trace-events > +++ b/accel/kvm/trace-events > @@ -8,6 +8,7 @@ kvm_run_exit(int cpu_index, uint32_t reason) "cpu_index %d, > reason %d" > kvm_device_ioctl(int fd, int type, void *arg) "dev fd %d, type 0x%x, arg %p" > kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to > retrieve ONEREG %" PRIu64 " from KVM: %s" > kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to set > ONEREG %" PRIu64 " to KVM: %s" > +kvm_init_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu" > kvm_irqchip_commit_routes(void) "" > kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector > %d virq %d" > kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d" > diff --git a/accel/stubs/kvm-stub.c b/accel/stubs/kvm-stub.c > index 82f118d2df9..cd573bfe3d9 100644 > --- a/accel/stubs/kvm-stub.c > +++ b/accel/stubs/kvm-stub.c > @@ -37,7 +37,7 @@ int kvm_destroy_vcpu(CPUState *cpu) > return -ENOSYS; > } > > -int kvm_init_vcpu(CPUState *cpu) > +int kvm_init_vcpu(CPUState *cpu, Error **errp) > { > return -ENOSYS; > } > diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h > index b4174d941c2..410848af514 100644 > --- a/include/sysemu/kvm.h > +++ b/include/sysemu/kvm.h > @@ -216,7 +216,7 @@ int kvm_has_many_ioeventfds(void); > int kvm_has_gsi_routing(void); > int kvm_has_intx_set_mask(void); > > -int kvm_init_vcpu(CPUState *cpu); > +int kvm_init_vcpu(CPUState *cpu, Error **errp); > int kvm_cpu_exec(CPUState *cpu); > int kvm_destroy_vcpu(CPUState *cpu); > > diff --git a/softmmu/cpus.c b/softmmu/cpus.c > index a802e899abb..9725fd9951f 100644 > --- a/softmmu/cpus.c > +++ b/softmmu/cpus.c > @@ -1170,11 +1170,7 @@ static void *qemu_kvm_cpu_thread_fn(void *arg) > cpu->can_do_io = 1; > current_cpu = cpu; > > - r = kvm_init_vcpu(cpu); > - if (r < 0) { > - error_report("kvm_init_vcpu failed: %s", strerror(-r)); > - exit(1); > - } > + kvm_init_vcpu(cpu, &error_fatal); > > kvm_init_cpu_signals(cpu); > >
