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Re: [libvirt] [PATCH 1/1] ppc64 cpu features



ping ...

On 2012年12月21日 17:34, Li Zhang wrote:
From: Li Zhang <zhlcindy linux vnet ibm com>

This patch adds a CPU feature "powernv" identifying IBM Power
processor that supports native hypervisor e.g. KVM. This can
be used by virtualization management software to determine
the CPU capabilities. PVR doesn't indicate whether it a
host or a guest CPU. So, we use /proc/cpuinfo to get the
platform information (PowerNV) and use that to set the
"powernv" flag.

Signed-off-by: Dipankar Sarma <dipankar in ibm com>
Signed-off-by: Li Zhang <zhlcindy linux vnet ibm com>
---
  src/cpu/cpu_map.xml    |    9 ++
  src/cpu/cpu_powerpc.c  |  349 ++++++++++++++++++++++++++++++++++++++----------
  src/cpu/cpu_ppc_data.h |    4 +
  src/util/sysinfo.c     |    2 +-
  4 files changed, 294 insertions(+), 70 deletions(-)

diff --git a/src/cpu/cpu_map.xml b/src/cpu/cpu_map.xml
index eb69a34..6b1f9b9 100644
--- a/src/cpu/cpu_map.xml
+++ b/src/cpu/cpu_map.xml
@@ -587,14 +587,23 @@
    <arch name='ppc64'>
     <!-- vendor definitions -->
      <vendor name='IBM' string='PowerPC'/>
+    <feature name='powernv'> <!-- SYSTEMID_POWERNV -->
+      <systemid platform='0x00000001'/>
+    </feature>
     <!-- IBM-based CPU models -->
      <model name='POWER7'>
+      <feature name='powernv'/>
+      <systemid pvr='0x003f0200'/>
        <vendor name='IBM'/>
      </model>
      <model name='POWER7_v2.1'>
+      <feature name='powernv'/>
+      <systemid pvr='0x003f0201'/>
        <vendor name='IBM'/>
      </model>
      <model name='POWER7_v2.3'>
+      <feature name='powernv'/>
+      <systemid pvr='0x003f0203'/>
        <vendor name='IBM'/>
      </model>
    </arch>
diff --git a/src/cpu/cpu_powerpc.c b/src/cpu/cpu_powerpc.c
index ac10789..2135944 100644
--- a/src/cpu/cpu_powerpc.c
+++ b/src/cpu/cpu_powerpc.c
@@ -33,6 +33,7 @@
#include "cpu_map.h"
  #include "buf.h"
+#include "sysinfo.h"
#define VIR_FROM_THIS VIR_FROM_CPU @@ -44,16 +45,9 @@ struct cpuPowerPC {
      uint32_t pvr;
  };
-static const struct cpuPowerPC cpu_defs[] = {
-    {"POWER7", "IBM", 0x003f0200},
-    {"POWER7_v2.1", "IBM", 0x003f0201},
-    {"POWER7_v2.3", "IBM", 0x003f0203},
-    {NULL, NULL, 0xffffffff}
-};
-
-
  struct ppc_vendor {
      char *name;
+    uint32_t pvr;
      struct ppc_vendor *next;
  };
@@ -64,64 +58,191 @@ struct ppc_model {
      struct ppc_model *next;
  };
+struct ppc_feature {
+    char *name;
+    union cpuData *data;
+    struct ppc_feature *next;
+};
+
  struct ppc_map {
      struct ppc_vendor *vendors;
+    struct ppc_feature *features;
      struct ppc_model *models;
  };
+static void
+ppcDataSubtract(union cpuData *data1,
+                const union cpuData *data2)
+{
+    data1->ppc.platform &= ~data2->ppc.platform;
+}
+
+static bool
+ppcDataIsSubset(const union cpuData *data,
+                const union cpuData *subset)
+{
+    if (subset->ppc.platform &&
+       (data->ppc.platform & subset->ppc.platform) == subset->ppc.platform)
+        return true;
+
+    return false;
+}
+
+static void
+PowerPCDataFree(union cpuData *data)
+{
+    if (data == NULL)
+        return;
+    VIR_FREE(data);
+}
+
+
+static union cpuData *
+ppcDataCopy(const union cpuData *data)
+{
+    union cpuData *copy = NULL;
+
+    if (VIR_ALLOC(copy) < 0) {
+        PowerPCDataFree(copy);
+        return NULL;
+    }
+    copy->ppc = data->ppc;
+    return copy;
+}
+
+
+/* also removes all detected features from data */
  static int
-ConvertModelVendorFromPVR(char ***model,
-                          char ***vendor,
-                          uint32_t pvr)
+ppcDataToCPUFeatures(virCPUDefPtr cpu,
+                     int policy,
+                     union cpuData *data,
+                     const struct ppc_map *map)
  {
-    int i;
+    const struct ppc_feature *feature = map->features;
- for (i = 0; cpu_defs[i].name; i++) {
-        if (cpu_defs[i].pvr == pvr) {
-            **model = strdup(cpu_defs[i].name);
-            **vendor = strdup(cpu_defs[i].vendor);
-            return 0;
+    while (feature != NULL) {
+        if (ppcDataIsSubset(data, feature->data)) {
+            ppcDataSubtract(data, feature->data);
+            if (virCPUDefAddFeature(cpu, feature->name, policy) < 0)
+                return -1;
          }
+        feature = feature->next;
      }
- virReportError(VIR_ERR_INTERNAL_ERROR,
-                   "%s", _("Missing the definition of this model"));
-    return -1;
+    return 0;
  }
-static int
-ConvertPVRFromModel(const char *model,
-                    uint32_t *pvr)
+static struct ppc_feature *
+ppcFeatureNew(void)
  {
-    int i;
+    struct ppc_feature *feature;
- for (i = 0; cpu_defs[i].name; i++) {
-        if (STREQ(cpu_defs[i].name, model)) {
-            *pvr = cpu_defs[i].pvr;
-            return 0;
-        }
+    if (VIR_ALLOC(feature) < 0)
+        return NULL;
+
+    if (VIR_ALLOC(feature->data) < 0) {
+        VIR_FREE(feature);
+        return NULL;
+    }
+
+    return feature;
+}
+
+
+static void
+ppcFeatureFree(struct ppc_feature *feature)
+{
+    if (feature == NULL)
+        return;
+
+    VIR_FREE(feature->name);
+    PowerPCDataFree(feature->data);
+    VIR_FREE(feature);
+}
+
+
+static struct ppc_feature *
+ppcFeatureFind(const struct ppc_map *map,
+               const char *name)
+{
+    struct ppc_feature *feature;
+
+    feature = map->features;
+    while (feature != NULL) {
+        if (STREQ(feature->name, name))
+            return feature;
+
+        feature = feature->next;
      }
- virReportError(VIR_ERR_INTERNAL_ERROR,
-                   "%s", _("Missing the definition of this model"));
-    return -1;
+    return NULL;
  }
static int
-cpuMatch(const union cpuData *data,
-         char **cpu_model,
-         char **cpu_vendor,
-         const struct ppc_model *model)
+ppcFeatureLoad(xmlXPathContextPtr ctxt,
+               struct ppc_map *map)
  {
+    xmlNodePtr *nodes = NULL;
+    xmlNodePtr ctxt_node = ctxt->node;
+    struct ppc_feature *feature;
      int ret = 0;
+    unsigned long platform = 0;
+    unsigned long pvr = 0;
+    int ret_platform;
+    int ret_pvr;
+    int n;
+
+    if (!(feature = ppcFeatureNew()))
+        goto no_memory;
+
+    feature->name = virXPathString("string(@name)", ctxt);
+    if (feature->name == NULL) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       "%s", _("Missing CPU feature name"));
+        goto ignore;
+    }
+
+    if (ppcFeatureFind(map, feature->name)) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("CPU feature %s already defined"), feature->name);
+        goto ignore;
+    }
+
+    n = virXPathNodeSet("./systemid", ctxt, &nodes);
+    if (n < 0)
+        goto ignore;
+
+    ctxt->node = nodes[0];
+    ret_platform = virXPathULongHex("string(@platform)", ctxt, &platform);
+    ret_pvr = virXPathULongHex("string(@pvr)", ctxt, &pvr);
+    if (ret_platform < 0 && ret_pvr < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("Invalid systemid in %s feature"), feature->name);
+            goto ignore;
+    }
+    feature->data->ppc.platform = platform;
+    feature->data->ppc.pvr = pvr;
- ret = ConvertModelVendorFromPVR(&cpu_model, &cpu_vendor, data->ppc.pvr);
+    if (map->features == NULL)
+        map->features = feature;
+    else {
+        feature->next = map->features;
+        map->features = feature;
+    }
- if (STREQ(model->name, *cpu_model) &&
-        STREQ(model->vendor->name, *cpu_vendor))
-        ret = 1;
+out:
+    ctxt->node = ctxt_node;
+    VIR_FREE(nodes);
return ret;
+
+no_memory:
+    virReportOOMError();
+    ret = -1;
+
+ignore:
+    ppcFeatureFree(feature);
+    goto out;
  }
@@ -171,6 +292,66 @@ ppcModelFind(const struct ppc_map *map,
      return NULL;
  }
+/* also removes bits corresponding to vendor string from data */
+static const struct ppc_vendor *
+ppcDataToVendor(union cpuData *data,
+                const struct ppc_map *map)
+{
+    const struct ppc_vendor *vendor = map->vendors;
+
+    while (vendor) {
+        if (data->ppc.pvr == vendor->pvr)
+            return vendor;
+        vendor = vendor->next;
+    }
+
+    return NULL;
+}
+
+
+static virCPUDefPtr
+ppcDataToCPU(const union cpuData *data,
+             const struct ppc_model *model,
+             const struct ppc_map *map)
+{
+    virCPUDefPtr cpu;
+    union cpuData *copy = NULL;
+    union cpuData *modelData = NULL;
+    const struct ppc_vendor *vendor;
+
+    if (VIR_ALLOC(cpu) < 0 ||
+        !(cpu->model = strdup(model->name)) ||
+        !(copy = ppcDataCopy(data)) ||
+        !(modelData = ppcDataCopy(model->data)))
+        goto no_memory;
+
+    if ((vendor = ppcDataToVendor(copy, map)) &&
+        !(cpu->vendor = strdup(vendor->name)))
+        goto no_memory;
+
+    ppcDataSubtract(copy, modelData);
+    ppcDataSubtract(modelData, data);
+
+    /* because feature policy is ignored for host CPU */
+    cpu->type = VIR_CPU_TYPE_GUEST;
+
+    if (ppcDataToCPUFeatures(cpu, VIR_CPU_FEATURE_REQUIRE, copy, map) ||
+        ppcDataToCPUFeatures(cpu, VIR_CPU_FEATURE_DISABLE, modelData, map))
+        goto error;
+
+cleanup:
+    PowerPCDataFree(modelData);
+    PowerPCDataFree(copy);
+    return cpu;
+
+no_memory:
+    virReportOOMError();
+error:
+    virCPUDefFree(cpu);
+    cpu = NULL;
+    goto cleanup;
+}
+
  static struct ppc_vendor *
  ppcVendorFind(const struct ppc_map *map,
                const char *name)
@@ -256,6 +437,9 @@ ppcModelLoad(xmlXPathContextPtr ctxt,
      xmlNodePtr *nodes = NULL;
      struct ppc_model *model;
      char *vendor = NULL;
+    unsigned long pvr = 0, platform = 0;
+    int ret_platform, ret_pvr;
+    int n;
      int ret = -1;
if (!(model = ppcModelNew()))
@@ -268,10 +452,20 @@ ppcModelLoad(xmlXPathContextPtr ctxt,
          goto ignore;
      }
- ret = ConvertPVRFromModel(model->name, &model->data->ppc.pvr);
-    if (ret < 0)
-       goto ignore;
+    n = virXPathNodeSet("./systemid", ctxt, &nodes);
+    if (n < 0)
+        goto ignore;
+ ctxt->node = nodes[0];
+    ret_platform = virXPathULongHex("string(@platform)", ctxt, &platform);
+    ret_pvr = virXPathULongHex("string(@pvr)", ctxt, &pvr);
+    if (ret_platform < 0 && ret_pvr < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("Invalid systemid in %s model"), model->name);
+            goto ignore;
+    }
+    model->data->ppc.platform = platform;
+    model->data->ppc.pvr = pvr;
if (virXPathBoolean("boolean(./vendor)", ctxt)) {
          vendor = virXPathString("string(./vendor/@name)", ctxt);
@@ -324,6 +518,8 @@ ppcMapLoadCallback(enum cpuMapElement element,
          return ppcVendorLoad(ctxt, map);
      case CPU_MAP_ELEMENT_MODEL:
          return ppcModelLoad(ctxt, map);
+    case CPU_MAP_ELEMENT_FEATURE:
+        return ppcFeatureLoad(ctxt, map);
      default:
          break;
      }
@@ -385,6 +581,7 @@ ppcModelCopy(const struct ppc_model *model)
      }
copy->data->ppc.pvr = model->data->ppc.pvr;
+    copy->data->ppc.platform = model->data->ppc.platform;
      copy->vendor = model->vendor;
return copy;
@@ -437,8 +634,6 @@ PowerPCDecode(virCPUDefPtr cpu,
      const struct ppc_model *candidate;
      virCPUDefPtr cpuCandidate;
      virCPUDefPtr cpuModel = NULL;
-    char *cpu_vendor = NULL;
-    char *cpu_model = NULL;
      unsigned int i;
if (data == NULL || (map = ppcLoadMap()) == NULL)
@@ -475,13 +670,30 @@ PowerPCDecode(virCPUDefPtr cpu,
              goto next;
          }
- if (VIR_ALLOC(cpuCandidate) < 0) {
-            virReportOOMError();
+        if (!(cpuCandidate = ppcDataToCPU(data, candidate, map)))
              goto out;
+
+        if (candidate->vendor && cpuCandidate->vendor &&
+            STRNEQ(candidate->vendor->name, cpuCandidate->vendor)) {
+            VIR_DEBUG("CPU vendor %s of model %s differs from %s; ignoring",
+                      candidate->vendor->name, candidate->name,
+                      cpuCandidate->vendor);
+            virCPUDefFree(cpuCandidate);
+            goto next;
          }
- cpuCandidate->model = strdup(candidate->name);
-        cpuCandidate->vendor = strdup(candidate->vendor->name);
+        if (cpu->type == VIR_CPU_TYPE_HOST) {
+            cpuCandidate->type = VIR_CPU_TYPE_HOST;
+            for (i = 0; i < cpuCandidate->nfeatures; i++) {
+                switch (cpuCandidate->features[i].policy) {
+                case VIR_CPU_FEATURE_DISABLE:
+                    virCPUDefFree(cpuCandidate);
+                    goto next;
+                default:
+                    cpuCandidate->features[i].policy = -1;
+                }
+            }
+        }
if (preferred && STREQ(cpuCandidate->model, preferred)) {
              virCPUDefFree(cpuModel);
@@ -489,19 +701,12 @@ PowerPCDecode(virCPUDefPtr cpu,
              break;
          }
- ret = cpuMatch(data, &cpu_model, &cpu_vendor, candidate);
-        if (ret < 0) {
-            VIR_FREE(cpuCandidate);
-            goto out;
-        } else if (ret == 1) {
-            cpuCandidate->model = cpu_model;
-            cpuCandidate->vendor = cpu_vendor;
+        if (cpuModel == NULL
+            || cpuModel->nfeatures > cpuCandidate->nfeatures) {
              virCPUDefFree(cpuModel);
              cpuModel = cpuCandidate;
-            break;
-        }
-
-        virCPUDefFree(cpuCandidate);
+        }else
+            virCPUDefFree(cpuCandidate);
next:
          candidate = candidate->next;
@@ -515,6 +720,8 @@ PowerPCDecode(virCPUDefPtr cpu,
cpu->model = cpuModel->model;
      cpu->vendor = cpuModel->vendor;
+    cpu->nfeatures = cpuModel->nfeatures;
+    cpu->features = cpuModel->features;
      VIR_FREE(cpuModel);
ret = 0;
@@ -537,19 +744,11 @@ static uint32_t ppc_mfpvr(void)
  }
  #endif
-static void
-PowerPCDataFree(union cpuData *data)
-{
-    if (data == NULL)
-        return;
-
-    VIR_FREE(data);
-}
-
  static union cpuData *
  PowerPCNodeData(void)
  {
      union cpuData *data;
+    virSysinfoDefPtr hostinfo;
if (VIR_ALLOC(data) < 0) {
          virReportOOMError();
@@ -561,6 +760,18 @@ PowerPCNodeData(void)
      data->ppc.pvr = ppc_mfpvr();
  #endif
+ hostinfo = virSysinfoRead();
+    if (hostinfo == NULL) {
+        VIR_FREE(data);
+        return NULL;
+    }
+
+    data->ppc.platform &= ~VIR_CPU_PPC64_POWERNV;
+
+    if (STREQ(hostinfo->system_family, "PowerNV"))
+        data->ppc.platform |= VIR_CPU_PPC64_POWERNV;
+    virSysinfoDefFree(hostinfo);
+
      return data;
  }
diff --git a/src/cpu/cpu_ppc_data.h b/src/cpu/cpu_ppc_data.h
index 685332a..0e691ce 100644
--- a/src/cpu/cpu_ppc_data.h
+++ b/src/cpu/cpu_ppc_data.h
@@ -28,6 +28,10 @@
struct cpuPPCData {
      uint32_t pvr;
+    uint32_t platform; /* Bitflag indicating platform features */
  };
+#define VIR_CPU_PPC64_NONE 0x0
+#define VIR_CPU_PPC64_POWERNV	0x1
+
  #endif /* __VIR_CPU_PPC_DATA_H__ */
diff --git a/src/util/sysinfo.c b/src/util/sysinfo.c
index 6a5db80..5f98986 100644
--- a/src/util/sysinfo.c
+++ b/src/util/sysinfo.c
@@ -234,7 +234,7 @@ virSysinfoRead(void) {
      if (VIR_ALLOC(ret) < 0)
          goto no_memory;
- if (virFileReadAll(CPUINFO, 2048, &outbuf) < 0) {
+    if (virFileReadAll(CPUINFO, 8192, &outbuf) < 0) {
          virReportError(VIR_ERR_INTERNAL_ERROR,
                         _("Failed to open %s"), CPUINFO);
          return NULL;


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