[PULL 14/17] error: Use error_setg_errno() to improve error messages

Markus Armbruster posted 17 patches 1 month ago
Maintainers: "Gonglei (Arei)" <arei.gonglei@huawei.com>, zhenwei pi <zhenwei.pi@linux.dev>, Alistair Francis <alistair.francis@wdc.com>, Stefan Berger <stefanb@linux.vnet.ibm.com>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Stefan Weil <sw@weilnetz.de>, Christian Schoenebeck <qemu_oss@crudebyte.com>, Greg Kurz <groug@kaod.org>, "Michael S. Tsirkin" <mst@redhat.com>, Igor Mammedov <imammedo@redhat.com>, Ani Sinha <anisinha@redhat.com>, Dongjiu Geng <gengdongjiu1@gmail.com>, Peter Maydell <peter.maydell@linaro.org>, Gerd Hoffmann <kraxel@redhat.com>, Bernhard Beschow <shentey@gmail.com>, Nicholas Piggin <npiggin@gmail.com>, Harsh Prateek Bora <harshpb@linux.ibm.com>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Stefano Stabellini <sstabellini@kernel.org>, Anthony PERARD <anthony@xenproject.org>, Paul Durrant <paul@xen.org>, Elena Ufimtseva <elena.ufimtseva@oracle.com>, Jagannathan Raman <jag.raman@oracle.com>, Palmer Dabbelt <palmer@dabbelt.com>, Weiwei Li <liwei1518@gmail.com>, Daniel Henrique Barboza <dbarboza@ventanamicro.com>, Liu Zhiwei <zhiwei_liu@linux.alibaba.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Alex Williamson <alex@shazbot.org>, "Cédric Le Goater" <clg@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>, Li Zhijian <lizhijian@fujitsu.com>, "Dr. David Alan Gilbert" <dave@treblig.org>, Eric Blake <eblake@redhat.com>, Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>, Jason Wang <jasowang@redhat.com>, Samuel Thibault <samuel.thibault@ens-lyon.org>, Michael Roth <michael.roth@amd.com>, Kostiantyn Kostiuk <kkostiuk@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Zhao Liu <zhao1.liu@intel.com>, Marcelo Tosatti <mtosatti@redhat.com>, Chinmay Rath <rathc@linux.ibm.com>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Yanan Wang <wangyanan55@huawei.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>
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[PULL 14/17] error: Use error_setg_errno() to improve error messages
Posted by Markus Armbruster 1 month ago
A few error messages show numeric errno codes.  Use error_setg_errno()
to show human-readable text instead.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20251121121438.1249498-13-armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 backends/cryptodev-lkcf.c   |  2 +-
 hw/ppc/spapr.c              |  6 +++---
 hw/vfio/migration-multifd.c |  5 +++--
 migration/rdma.c            |  3 +--
 net/l2tpv3.c                |  6 ++----
 target/riscv/kvm/kvm-cpu.c  | 11 ++++++-----
 6 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/backends/cryptodev-lkcf.c b/backends/cryptodev-lkcf.c
index 97a8a8812c..40c7bd3c5a 100644
--- a/backends/cryptodev-lkcf.c
+++ b/backends/cryptodev-lkcf.c
@@ -218,7 +218,7 @@ static void cryptodev_lkcf_init(CryptoDevBackend *backend, Error **errp)
     }
     lkcf->eventfd = eventfd(0, 0);
     if (lkcf->eventfd < 0) {
-        error_setg(errp, "Failed to create eventfd: %d", errno);
+        error_setg_errno(errp, errno, "Failed to create eventfd");
         return;
     }
 
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index b3c5097bf8..f129e4ec39 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2700,9 +2700,9 @@ static void spapr_set_vsmt_mode(SpaprMachineState *spapr, Error **errp)
         ret = kvmppc_set_smt_threads(spapr->vsmt);
         if (ret) {
             /* Looks like KVM isn't able to change VSMT mode */
-            error_setg(&local_err,
-                       "Failed to set KVM's VSMT mode to %d (errno %d)",
-                       spapr->vsmt, ret);
+            error_setg_errno(&local_err, -ret,
+                             "Failed to set KVM's VSMT mode to %d",
+                             spapr->vsmt);
             /* We can live with that if the default one is big enough
              * for the number of threads, and a submultiple of the one
              * we want.  In this case we'll waste some vcpu ids, but
diff --git a/hw/vfio/migration-multifd.c b/hw/vfio/migration-multifd.c
index e4785031a7..4a855f4e12 100644
--- a/hw/vfio/migration-multifd.c
+++ b/hw/vfio/migration-multifd.c
@@ -725,8 +725,9 @@ vfio_multifd_save_complete_precopy_thread(SaveCompletePrecopyThreadData *d,
         data_size = read(migration->data_fd, &packet->data,
                          migration->data_buffer_size);
         if (data_size < 0) {
-            error_setg(errp, "%s: reading state buffer %" PRIu32 " failed: %d",
-                       vbasedev->name, idx, errno);
+            error_setg_errno(errp, errno,
+                             "%s: reading state buffer %" PRIu32 " failed",
+                             vbasedev->name, idx);
             goto thread_exit;
         } else if (data_size == 0) {
             break;
diff --git a/migration/rdma.c b/migration/rdma.c
index 337b415889..9e301cf917 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -2349,8 +2349,7 @@ static int qemu_get_cm_event_timeout(RDMAContext *rdma,
         error_setg(errp, "RDMA ERROR: poll cm event timeout");
         return -1;
     } else if (ret < 0) {
-        error_setg(errp, "RDMA ERROR: failed to poll cm event, errno=%i",
-                   errno);
+        error_setg_errno(errp, errno, "RDMA ERROR: failed to poll cm event");
         return -1;
     } else if (poll_fd.revents & POLLIN) {
         if (rdma_get_cm_event(rdma->channel, cm_event) < 0) {
diff --git a/net/l2tpv3.c b/net/l2tpv3.c
index cdfc641aa6..3044fa4608 100644
--- a/net/l2tpv3.c
+++ b/net/l2tpv3.c
@@ -639,13 +639,11 @@ int net_init_l2tpv3(const Netdev *netdev,
     }
     fd = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
     if (fd == -1) {
-        fd = -errno;
-        error_setg(errp, "socket creation failed, errno = %d",
-                   -fd);
+        error_setg_errno(errp, errno, "socket creation failed");
         goto outerr;
     }
     if (bind(fd, (struct sockaddr *) result->ai_addr, result->ai_addrlen)) {
-        error_setg(errp, "could not bind socket err=%i", errno);
+        error_setg_errno(errp, errno, "could not bind socket");
         goto outerr;
     }
     if (!qemu_set_blocking(fd, false, errp)) {
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 5d792563b9..99284abbc6 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1996,8 +1996,8 @@ static bool kvm_cpu_realize(CPUState *cs, Error **errp)
     if (riscv_has_ext(&cpu->env, RVV)) {
         ret = prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON);
         if (ret) {
-            error_setg(errp, "Error in prctl PR_RISCV_V_SET_CONTROL, code: %s",
-                       strerrorname_np(errno));
+            error_setg_errno(errp, errno,
+                             "Error in prctl PR_RISCV_V_SET_CONTROL");
             return false;
         }
     }
@@ -2032,7 +2032,8 @@ void riscv_kvm_cpu_finalize_features(RISCVCPU *cpu, Error **errp)
         reg.addr = (uint64_t)&val;
         ret = ioctl(kvmcpu.cpufd, KVM_GET_ONE_REG, &reg);
         if (ret != 0) {
-            error_setg(errp, "Unable to read cbom_blocksize, error %d", errno);
+            error_setg(errp, errno,
+                       "Unable to read cbom_blocksize");
             return;
         }
 
@@ -2051,7 +2052,7 @@ void riscv_kvm_cpu_finalize_features(RISCVCPU *cpu, Error **errp)
         reg.addr = (uint64_t)&val;
         ret = ioctl(kvmcpu.cpufd, KVM_GET_ONE_REG, &reg);
         if (ret != 0) {
-            error_setg(errp, "Unable to read cboz_blocksize, error %d", errno);
+            error_setg_errno(errp, errno, "Unable to read cboz_blocksize");
             return;
         }
 
@@ -2073,7 +2074,7 @@ void riscv_kvm_cpu_finalize_features(RISCVCPU *cpu, Error **errp)
         reg.addr = (uint64_t)&val;
         ret = ioctl(kvmcpu.cpufd, KVM_GET_ONE_REG, &reg);
         if (ret != 0) {
-            error_setg(errp, "Unable to read vlenb register, error %d", errno);
+            error_setg_errno(errp, errno, "Unable to read vlenb register");
             return;
         }
 
-- 
2.52.0



Re: [PULL 14/17] error: Use error_setg_errno() to improve error messages
Posted by Richard Henderson 1 month ago
On 1/7/26 23:43, Markus Armbruster wrote:
> @@ -2032,7 +2032,8 @@ void riscv_kvm_cpu_finalize_features(RISCVCPU *cpu, Error **errp)
>           reg.addr = (uint64_t)&val;
>           ret = ioctl(kvmcpu.cpufd, KVM_GET_ONE_REG, &reg);
>           if (ret != 0) {
> -            error_setg(errp, "Unable to read cbom_blocksize, error %d", errno);
> +            error_setg(errp, errno,
> +                       "Unable to read cbom_blocksize");
>               return;
>           }
>   

Missed changing the function.

../target/riscv/kvm/kvm-cpu.c:2035:13: error: passing argument 5 of ‘error_setg_internal’ 
makes pointer from integer without a cast [-Wint-conversion]
  2035 |             error_setg(errp, errno,
       |             ^~~~~~~~~~
       |             |
       |             int
In file included from ../target/riscv/kvm/kvm-cpu.c:26:
../include/qapi/error.h:322:38: note: expected ‘const char *’ but argument is of type ‘int’
   322 |                          const char *fmt, ...)
       |                          ~~~~~~~~~~~~^~~

https://gitlab.com/qemu-project/qemu/-/jobs/12639739827


r~

Re: [PULL 14/17] error: Use error_setg_errno() to improve error messages
Posted by Markus Armbruster 1 month ago
Richard Henderson <richard.henderson@linaro.org> writes:

> On 1/7/26 23:43, Markus Armbruster wrote:
>> @@ -2032,7 +2032,8 @@ void riscv_kvm_cpu_finalize_features(RISCVCPU *cpu, Error **errp)
>>           reg.addr = (uint64_t)&val;
>>           ret = ioctl(kvmcpu.cpufd, KVM_GET_ONE_REG, &reg);
>>           if (ret != 0) {
>> -            error_setg(errp, "Unable to read cbom_blocksize, error %d", errno);
>> +            error_setg(errp, errno,
>> +                       "Unable to read cbom_blocksize");
>>               return;
>>           }
>>   
>
> Missed changing the function.

[...]

Sorry about that.  v2 coming.