libvirt/libvirt-cpu_x86-Introduce-virCPUx86DataAddMSR.patch

From d34cc77ac31f6df5195dad6b53d5aed00bda7dd7 Mon Sep 17 00:00:00 2001
Message-ID: <d34cc77ac31f6df5195dad6b53d5aed00bda7dd7.1780571167.git.jdenemar@redhat.com>
From: Jiri Denemark <jdenemar@redhat.com>
Date: Mon, 25 May 2026 13:17:47 +0200
Subject: [PATCH] cpu_x86: Introduce virCPUx86DataAddMSR

This just makes the relevant part of virCPUx86GetHost reusable in other
places.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
(cherry picked from commit a8952076d8e5062a2fac08e11597ad47871c2236)

https://redhat.atlassian.net/browse/RHEL-177364

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/cpu/cpu_x86.c        | 40 ++++++++++++++++++++++++++++------------
 src/cpu/cpu_x86.h        |  4 ++++
 src/libvirt_private.syms |  1 +
 3 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index 0f7eb8f48b..e5825fbb4d 100644
--- a/src/cpu/cpu_x86.c
+++ b/src/cpu/cpu_x86.c
@@ -2912,18 +2912,8 @@ virCPUx86GetHost(virCPUDef *cpu,
     /* This is best effort since there might be no way to read the MSR
      * when we are not running as root. */
     for (i = 0; i < nmsrs; i++) {
-        if (virHostCPUGetMSR(msrs[i], &msr) == 0) {
-            virCPUx86DataItem item = {
-                .type = VIR_CPU_X86_DATA_MSR,
-                .data.msr = {
-                    .index = msrs[i],
-                    .eax = msr & 0xffffffff,
-                    .edx = msr >> 32,
-                },
-            };
-
-            virCPUx86DataAdd(cpuData, &item);
-        }
+        if (virHostCPUGetMSR(msrs[i], &msr) == 0)
+            virCPUx86DataAddMSR(cpuData, msrs[i], msr);
     }
 
     ret = x86DecodeCPUData(cpu, cpuData, models);
@@ -3461,6 +3451,32 @@ virCPUx86DataAdd(virCPUData *cpuData,
 }
 
 
+/**
+ * virCPUx86DataAddMSR:
+ * @cpuData: CPU data to update
+ * @index: MSR index
+ * @value: content of the @index MSR
+ *
+ * Adds the specified MSR content to CPU data.
+ */
+void
+virCPUx86DataAddMSR(virCPUData *cpuData,
+                    uint32_t index,
+                    uint64_t value)
+{
+    virCPUx86DataItem item = {
+        .type = VIR_CPU_X86_DATA_MSR,
+        .data.msr = {
+            .index = index,
+            .eax = value & 0xffffffff,
+            .edx = value >> 32,
+        },
+    };
+
+    virCPUx86DataAdd(cpuData, &item);
+}
+
+
 void
 virCPUx86DataSetSignature(virCPUData *cpuData,
                           unsigned int family,
diff --git a/src/cpu/cpu_x86.h b/src/cpu/cpu_x86.h
index 2cd965fea4..bbc2a16447 100644
--- a/src/cpu/cpu_x86.h
+++ b/src/cpu/cpu_x86.h
@@ -28,6 +28,10 @@ extern struct cpuArchDriver cpuDriverX86;
 void virCPUx86DataAdd(virCPUData *cpuData,
                       const virCPUx86DataItem *cpuid);
 
+void virCPUx86DataAddMSR(virCPUData *cpuData,
+                         uint32_t index,
+                         uint64_t value);
+
 void virCPUx86DataSetSignature(virCPUData *cpuData,
                                unsigned int family,
                                unsigned int model,
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 3eca15f066..3eb6943440 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1592,6 +1592,7 @@ virCPUValidateFeatures;
 
 # cpu/cpu_x86.h
 virCPUx86DataAdd;
+virCPUx86DataAddMSR;
 virCPUx86DataGetSignature;
 virCPUx86DataSetSignature;
 virCPUx86DataSetVendor;
-- 
2.54.0