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  3. [libvirt] [PATCH 0/2] qemu: Fix upgrade with running domains with host-model CPUs
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[libvirt] [PATCH 1/2] qemu: Separate fetching CPU definitions from filling qemuCaps

Jiri Denemark posted 2 patches 7 years, 5 months ago
[libvirt] [PATCH 1/2] qemu: Separate fetching CPU definitions from filling qemuCaps
Posted by Jiri Denemark 7 years, 5 months ago 
virQEMUCapsProbeQMPCPUDefinitions is now a small wrapper which fills in
qemuCaps with CPU models fetched by virQEMUCapsFetchCPUDefinitions.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/qemu/qemu_capabilities.c | 59 +++++++++++++++++++++++++++-----------------
 src/qemu/qemu_capabilities.h |  1 +
 2 files changed, 38 insertions(+), 22 deletions(-)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 29714855b0..8c65de956e 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -2956,30 +2956,19 @@ virQEMUCapsProbeQMPMachineTypes(virQEMUCapsPtr qemuCaps,
 }
 
 
-int
-virQEMUCapsProbeQMPCPUDefinitions(virQEMUCapsPtr qemuCaps,
-                                  qemuMonitorPtr mon,
-                                  bool tcg)
+virDomainCapsCPUModelsPtr
+virQEMUCapsFetchCPUDefinitions(qemuMonitorPtr mon)
 {
-    virDomainCapsCPUModelsPtr models;
-    qemuMonitorCPUDefInfoPtr *cpus;
-    int ncpus;
-    int ret = -1;
+    virDomainCapsCPUModelsPtr models = NULL;
+    qemuMonitorCPUDefInfoPtr *cpus = NULL;
+    int ncpus = 0;
     size_t i;
 
-    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_DEFINITIONS))
-        return 0;
-
     if ((ncpus = qemuMonitorGetCPUDefinitions(mon, &cpus)) < 0)
-        return -1;
+        goto error;
 
     if (!(models = virDomainCapsCPUModelsNew(ncpus)))
-        goto cleanup;
-
-    if (tcg || !virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM))
-        qemuCaps->tcgCPUModels = models;
-    else
-        qemuCaps->kvmCPUModels = models;
+        goto error;
 
     for (i = 0; i < ncpus; i++) {
         virDomainCapsCPUUsable usable = VIR_DOMCAPS_CPU_USABLE_UNKNOWN;
@@ -2991,18 +2980,44 @@ virQEMUCapsProbeQMPCPUDefinitions(virQEMUCapsPtr qemuCaps,
 
         if (virDomainCapsCPUModelsAddSteal(models, &cpus[i]->name, usable,
                                            &cpus[i]->blockers) < 0)
-            goto cleanup;
+            goto error;
     }
 
-    ret = 0;
-
  cleanup:
     for (i = 0; i < ncpus; i++)
         qemuMonitorCPUDefInfoFree(cpus[i]);
     VIR_FREE(cpus);
-    return ret;
+    return models;
+
+ error:
+    virObjectUnref(models);
+    models = NULL;
+    goto cleanup;
 }
 
+
+int
+virQEMUCapsProbeQMPCPUDefinitions(virQEMUCapsPtr qemuCaps,
+                                  qemuMonitorPtr mon,
+                                  bool tcg)
+{
+    virDomainCapsCPUModelsPtr models = NULL;
+
+    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_DEFINITIONS))
+        return 0;
+
+    if (!(models = virQEMUCapsFetchCPUDefinitions(mon)))
+        return -1;
+
+    if (tcg || !virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM))
+        qemuCaps->tcgCPUModels = models;
+    else
+        qemuCaps->kvmCPUModels = models;
+
+    return 0;
+}
+
+
 static int
 virQEMUCapsProbeQMPHostCPU(virQEMUCapsPtr qemuCaps,
                            qemuMonitorPtr mon,
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 9f239a0ecf..e73dbaa557 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -485,6 +485,7 @@ int virQEMUCapsAddCPUDefinitions(virQEMUCapsPtr qemuCaps,
                                  virDomainCapsCPUUsable usable);
 virDomainCapsCPUModelsPtr virQEMUCapsGetCPUDefinitions(virQEMUCapsPtr qemuCaps,
                                                        virDomainVirtType type);
+virDomainCapsCPUModelsPtr virQEMUCapsFetchCPUDefinitions(qemuMonitorPtr mon);
 
 typedef enum {
     /* Host CPU definition reported in domain capabilities. */
-- 
2.15.1

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Re: [libvirt] [PATCH 1/2] qemu: Separate fetching CPU definitions from filling qemuCaps
Posted by John Ferlan 7 years, 5 months ago 

On 12/07/2017 08:20 AM, Jiri Denemark wrote:
> virQEMUCapsProbeQMPCPUDefinitions is now a small wrapper which fills in
> qemuCaps with CPU models fetched by virQEMUCapsFetchCPUDefinitions.
> 
> Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
> ---
>  src/qemu/qemu_capabilities.c | 59 +++++++++++++++++++++++++++-----------------
>  src/qemu/qemu_capabilities.h |  1 +
>  2 files changed, 38 insertions(+), 22 deletions(-)
> 
> diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
> index 29714855b0..8c65de956e 100644
> --- a/src/qemu/qemu_capabilities.c
> +++ b/src/qemu/qemu_capabilities.c
> @@ -2956,30 +2956,19 @@ virQEMUCapsProbeQMPMachineTypes(virQEMUCapsPtr qemuCaps,
>  }
>  
>  
> -int
> -virQEMUCapsProbeQMPCPUDefinitions(virQEMUCapsPtr qemuCaps,
> -                                  qemuMonitorPtr mon,
> -                                  bool tcg)
> +virDomainCapsCPUModelsPtr
> +virQEMUCapsFetchCPUDefinitions(qemuMonitorPtr mon)
>  {
> -    virDomainCapsCPUModelsPtr models;
> -    qemuMonitorCPUDefInfoPtr *cpus;
> -    int ncpus;
> -    int ret = -1;
> +    virDomainCapsCPUModelsPtr models = NULL;
> +    qemuMonitorCPUDefInfoPtr *cpus = NULL;
> +    int ncpus = 0;
>      size_t i;
>  
> -    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_DEFINITIONS))
> -        return 0;
> -
>      if ((ncpus = qemuMonitorGetCPUDefinitions(mon, &cpus)) < 0)
> -        return -1;
> +        goto error;

This adjustment causes a Coverity found problem for the "for (i = 0; i <
ncpus; i++)" in cleanup: on failure ncpus == -1.

John

>  
>      if (!(models = virDomainCapsCPUModelsNew(ncpus)))
> -        goto cleanup;
> -
> -    if (tcg || !virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM))
> -        qemuCaps->tcgCPUModels = models;
> -    else
> -        qemuCaps->kvmCPUModels = models;
> +        goto error;
>  
>      for (i = 0; i < ncpus; i++) {
>          virDomainCapsCPUUsable usable = VIR_DOMCAPS_CPU_USABLE_UNKNOWN;
> @@ -2991,18 +2980,44 @@ virQEMUCapsProbeQMPCPUDefinitions(virQEMUCapsPtr qemuCaps,
>  
>          if (virDomainCapsCPUModelsAddSteal(models, &cpus[i]->name, usable,
>                                             &cpus[i]->blockers) < 0)
> -            goto cleanup;
> +            goto error;
>      }
>  
> -    ret = 0;
> -
>   cleanup:
>      for (i = 0; i < ncpus; i++)
>          qemuMonitorCPUDefInfoFree(cpus[i]);
>      VIR_FREE(cpus);
> -    return ret;
> +    return models;
> +
> + error:
> +    virObjectUnref(models);
> +    models = NULL;
> +    goto cleanup;
>  }
>  
> +
> +int
> +virQEMUCapsProbeQMPCPUDefinitions(virQEMUCapsPtr qemuCaps,
> +                                  qemuMonitorPtr mon,
> +                                  bool tcg)
> +{
> +    virDomainCapsCPUModelsPtr models = NULL;
> +
> +    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_DEFINITIONS))
> +        return 0;
> +
> +    if (!(models = virQEMUCapsFetchCPUDefinitions(mon)))
> +        return -1;
> +
> +    if (tcg || !virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM))
> +        qemuCaps->tcgCPUModels = models;
> +    else
> +        qemuCaps->kvmCPUModels = models;
> +
> +    return 0;
> +}
> +
> +
>  static int
>  virQEMUCapsProbeQMPHostCPU(virQEMUCapsPtr qemuCaps,
>                             qemuMonitorPtr mon,
> diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
> index 9f239a0ecf..e73dbaa557 100644
> --- a/src/qemu/qemu_capabilities.h
> +++ b/src/qemu/qemu_capabilities.h
> @@ -485,6 +485,7 @@ int virQEMUCapsAddCPUDefinitions(virQEMUCapsPtr qemuCaps,
>                                   virDomainCapsCPUUsable usable);
>  virDomainCapsCPUModelsPtr virQEMUCapsGetCPUDefinitions(virQEMUCapsPtr qemuCaps,
>                                                         virDomainVirtType type);
> +virDomainCapsCPUModelsPtr virQEMUCapsFetchCPUDefinitions(qemuMonitorPtr mon);
>  
>  typedef enum {
>      /* Host CPU definition reported in domain capabilities. */
> 

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Re: [libvirt] [PATCH 1/2] qemu: Separate fetching CPU definitions from filling qemuCaps
Posted by Jiri Denemark 7 years, 5 months ago 
On Mon, Dec 11, 2017 at 07:59:44 -0500, John Ferlan wrote:
> 
> 
> On 12/07/2017 08:20 AM, Jiri Denemark wrote:
> > virQEMUCapsProbeQMPCPUDefinitions is now a small wrapper which fills in
> > qemuCaps with CPU models fetched by virQEMUCapsFetchCPUDefinitions.
> > 
> > Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
> > ---
> >  src/qemu/qemu_capabilities.c | 59 +++++++++++++++++++++++++++-----------------
> >  src/qemu/qemu_capabilities.h |  1 +
> >  2 files changed, 38 insertions(+), 22 deletions(-)
> > 
> > diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
> > index 29714855b0..8c65de956e 100644
> > --- a/src/qemu/qemu_capabilities.c
> > +++ b/src/qemu/qemu_capabilities.c
> > @@ -2956,30 +2956,19 @@ virQEMUCapsProbeQMPMachineTypes(virQEMUCapsPtr qemuCaps,
> >  }
> >  
> >  
> > -int
> > -virQEMUCapsProbeQMPCPUDefinitions(virQEMUCapsPtr qemuCaps,
> > -                                  qemuMonitorPtr mon,
> > -                                  bool tcg)
> > +virDomainCapsCPUModelsPtr
> > +virQEMUCapsFetchCPUDefinitions(qemuMonitorPtr mon)
> >  {
> > -    virDomainCapsCPUModelsPtr models;
> > -    qemuMonitorCPUDefInfoPtr *cpus;
> > -    int ncpus;
> > -    int ret = -1;
> > +    virDomainCapsCPUModelsPtr models = NULL;
> > +    qemuMonitorCPUDefInfoPtr *cpus = NULL;
> > +    int ncpus = 0;
> >      size_t i;
> >  
> > -    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_DEFINITIONS))
> > -        return 0;
> > -
> >      if ((ncpus = qemuMonitorGetCPUDefinitions(mon, &cpus)) < 0)
> > -        return -1;
> > +        goto error;
> 
> This adjustment causes a Coverity found problem for the "for (i = 0; i <
> ncpus; i++)" in cleanup: on failure ncpus == -1.

Oh right, a patch is coming...

Jirka

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