cpu_x86: Store CPU signature in an array

In preparation for storing several CPU signatures in a single CPU model,
we need to turn virCPUx86Model's signature into an array of signatures.

The parser still hardcodes the number of signatures to 1, but the
following patch will drop this limit.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index 0be1b12cdbd1e3993c784f7e5e1c604926e2d1e8..3577f31aa05fbcecbf9cc98d0797d406a00311e2 100644 (file)
--- a/src/cpu/cpu_x86.c
+++ b/src/cpu/cpu_x86.c
@@ -147,7 +147,8 @@ typedef virCPUx86Model *virCPUx86ModelPtr;
 struct _virCPUx86Model {
     char *name;
     virCPUx86VendorPtr vendor;
-    uint32_t signature;
+    size_t nsignatures;
+    uint32_t *signatures;
     virCPUx86Data data;
 };
 
@@ -974,6 +975,7 @@ x86ModelFree(virCPUx86ModelPtr model)
         return;
 
     VIR_FREE(model->name);
+    VIR_FREE(model->signatures);
     virCPUx86DataClear(&model->data);
     VIR_FREE(model);
 }
@@ -983,7 +985,14 @@ static int
 x86ModelCopySignatures(virCPUx86ModelPtr dst,
                        virCPUx86ModelPtr src)
 {
-    dst->signature = src->signature;
+    size_t i;
+
+    if (VIR_ALLOC_N(dst->signatures, src->nsignatures) < 0)
+        return -1;
+
+    dst->nsignatures = src->nsignatures;
+    for (i = 0; i < src->nsignatures; i++)
+        dst->signatures[i] = src->signatures[i];
 
     return 0;
 }
@@ -1200,12 +1209,18 @@ static int
 x86ModelParseSignature(virCPUx86ModelPtr model,
                        xmlXPathContextPtr ctxt)
 {
+    /* Remove inherited signatures. */
+    VIR_FREE(model->signatures);
 
     if (virXPathBoolean("boolean(./signature)", ctxt)) {
         unsigned int sigFamily = 0;
         unsigned int sigModel = 0;
         int rc;
 
+        model->nsignatures = 1;
+        if (VIR_ALLOC_N(model->signatures, 1) < 0)
+            return -1;
+
         rc = virXPathUInt("string(./signature/@family)", ctxt, &sigFamily);
         if (rc < 0 || sigFamily == 0) {
             virReportError(VIR_ERR_INTERNAL_ERROR,
@@ -1222,7 +1237,7 @@ x86ModelParseSignature(virCPUx86ModelPtr model,
             return -1;
         }
 
-        model->signature = x86MakeSignature(sigFamily, sigModel, 0);
+        model->signatures[0] = x86MakeSignature(sigFamily, sigModel, 0);
     }
 
     return 0;
@@ -1625,7 +1640,8 @@ x86Compute(virCPUDefPtr host,
                                      &host_model->vendor->cpuid) < 0)
             goto error;
 
-        if (x86DataAddSignature(&guest_model->data, host_model->signature) < 0)
+        if (host_model->signatures &&
+            x86DataAddSignature(&guest_model->data, *host_model->signatures) < 0)
             goto error;
 
         if (cpu->type == VIR_CPU_TYPE_GUEST
@@ -1731,6 +1747,21 @@ virCPUx86Compare(virCPUDefPtr host,
 }
 
 
+static bool
+x86ModelHasSignature(virCPUx86ModelPtr model,
+                     uint32_t signature)
+{
+    size_t i;
+
+    for (i = 0; i < model->nsignatures; i++) {
+        if (model->signatures[i] == signature)
+            return true;
+    }
+
+    return false;
+}
+
+
 /*
  * Checks whether a candidate model is a better fit for the CPU data than the
  * current model.
@@ -1772,8 +1803,8 @@ x86DecodeUseCandidate(virCPUx86ModelPtr current,
      * consider candidates with matching family/model.
      */
     if (signature &&
-        current->signature == signature &&
-        candidate->signature != signature) {
+        x86ModelHasSignature(current, signature) &&
+        !x86ModelHasSignature(candidate, signature)) {
         VIR_DEBUG("%s differs in signature from matching %s",
                   cpuCandidate->model, cpuCurrent->model);
         return 0;
@@ -1789,8 +1820,8 @@ x86DecodeUseCandidate(virCPUx86ModelPtr current,
      * result in longer list of features.
      */
     if (signature &&
-        candidate->signature == signature &&
-        current->signature != signature) {
+        x86ModelHasSignature(candidate, signature) &&
+        !x86ModelHasSignature(current, signature)) {
         VIR_DEBUG("%s provides matching signature", cpuCandidate->model);
         return 1;
     }
@@ -2858,7 +2889,8 @@ virCPUx86Translate(virCPUDefPtr cpu,
         virCPUx86DataAddCPUIDInt(&model->data, &model->vendor->cpuid) < 0)
         goto cleanup;
 
-    if (x86DataAddSignature(&model->data, model->signature) < 0)
+    if (model->signatures &&
+        x86DataAddSignature(&model->data, model->signatures[0]) < 0)
         goto cleanup;
 
     if (!(translated = virCPUDefCopyWithoutModel(cpu)))