Changeset 107570 in vbox for trunk/src/VBox/VMM/VMMR3

Timestamp:

Jan 9, 2025 9:23:18 AM (4 months ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

166643

Message:

VMM/CPUM: Report the host CPU microcode revision number to the guest when on an amd64 host. jiraref:VBP-947

File:

• trunk/src/VBox/VMM/VMMR3/CPUMR3CpuId.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMR3/CPUMR3CpuId.cpp

@@ -3396 +3396 @@
 #endif
 
+    /** @cfgm{/CPUM/GuestMicrocodeRev,32-bit}
+     * CPU microcode revision number to use.  If UINT32_MAX we use the host
+     * revision of the host CPU for the host-cpu profile and the database entry if a
+     * specific one is selected (amd64 host only). */
+    rc = CFGMR3QueryU32Def(pCpumCfg, "GuestMicrocodeRevision", &pCpum->GuestInfo.uMicrocodeRevision, UINT32_MAX);
+    AssertLogRelRCReturn(rc, rc);
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+    if (   pCpum->GuestInfo.uMicrocodeRevision == UINT32_MAX
+        && strcmp(Config.szCpuName, "host") == 0)
+    {
+        rc = SUPR3QueryMicrocodeRev(&pCpum->GuestInfo.uMicrocodeRevision);
+        if (RT_FAILURE(rc))
+            pCpum->GuestInfo.uMicrocodeRevision = UINT32_MAX;
+    }
+#endif
+
     /** @cfgm{/CPUM/MSRs/[Name]/[First|Last|Type|Value|...],}
      * Overrides the guest MSRs.