From 3335b5e0db21375053c5005be9f820f7ba945010 Mon Sep 17 00:00:00 2001

Message-Id: <3335b5e0db21375053c5005be9f820f7ba945010@dist-git>

From: Jiri Denemark <jdenemar@redhat.com>

Date: Fri, 21 Jun 2019 09:25:02 +0200

Subject: [PATCH] cpu_x86: Log decoded CPU model and signatures

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The log message may be useful when debugging why a specific CPU model

was selected for a given set of CPUID data.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>

Reviewed-by: Ján Tomko <jtomko@redhat.com>

(cherry picked from commit 5ced12decea42f1d588f2cb28b10ca7a5772098e)

https://bugzilla.redhat.com/show_bug.cgi?id=1686895

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>

Message-Id: <cae19825427465e352de05433920c96dc44552ff.1561068591.git.jdenemar@redhat.com>

Reviewed-by: Ján Tomko <jtomko@redhat.com>

---

 src/cpu/cpu_x86.c | 26 ++++++++++++++++++++++++++

 1 file changed, 26 insertions(+)

diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c

index 7bd8119c23..ba14a6097d 100644

--- a/src/cpu/cpu_x86.c

+++ b/src/cpu/cpu_x86.c

@@ -1769,6 +1769,26 @@ x86ModelHasSignature(virCPUx86ModelPtr model,

 }

+static char *

+x86FormatSignatures(virCPUx86ModelPtr model)

+{

+    virBuffer buf = VIR_BUFFER_INITIALIZER;

+    size_t i;

+

+    for (i = 0; i < model->nsignatures; i++) {

+        virBufferAsprintf(&buf, "%06lx,",

+                          (unsigned long)model->signatures[i]);

+    }

+

+    virBufferTrim(&buf, ",", -1);

+

+    if (virBufferCheckError(&buf) < 0)

+        return NULL;

+

+    return virBufferContentAndReset(&buf;;

+}

+

+

 /*

  * Checks whether a candidate model is a better fit for the CPU data than the

  * current model.

@@ -1892,6 +1912,7 @@ x86Decode(virCPUDefPtr cpu,

     virCPUx86Data features = VIR_CPU_X86_DATA_INIT;

     virCPUx86VendorPtr vendor;

     virDomainCapsCPUModelPtr hvModel = NULL;

+    VIR_AUTOFREE(char *) sigs = NULL;

     uint32_t signature;

     ssize_t i;

     int rc;

@@ -1984,6 +2005,11 @@ x86Decode(virCPUDefPtr cpu,

     if (vendor && VIR_STRDUP(cpu->vendor, vendor->name) < 0)

         goto cleanup;

+    sigs = x86FormatSignatures(model);

+

+    VIR_DEBUG("Using CPU model %s (signatures %s) for CPU with signature %06lx",

+              model->name, NULLSTR(sigs), (unsigned long)signature);

+

     VIR_STEAL_PTR(cpu->model, cpuModel->model);

     VIR_STEAL_PTR(cpu->features, cpuModel->features);

     cpu->nfeatures = cpuModel->nfeatures;

-- 

2.22.0