Changeset 77423 in vbox

Timestamp:

Feb 22, 2019 4:38:58 AM (6 years ago)

Author:

vboxsync

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

128984

Message:

SUPDrv: Use atomics while updating host MSR-cached global variable.

File:

• trunk/src/VBox/HostDrivers/Support/SUPDrv.cpp (modified) (2 diffs)

trunk/src/VBox/HostDrivers/Support/SUPDrv.cpp

@@ -4603 +4603 @@
      */
     if (   !fForce
-        && g_fHwvirtMsrsCached)
+        && ASMAtomicReadBool(&g_fHwvirtMsrsCached))
     {
         memcpy(pMsrs, &g_HwvirtMsrs, sizeof(*pMsrs));
@@ -4658 +4658 @@
                     g_HwvirtMsrs.u.vmx.u64VmFunc = ASMRdMsr(MSR_IA32_VMX_VMFUNC);
             }
-            g_fHwvirtMsrsCached = true;
+            ASMAtomicWriteBool(&g_fHwvirtMsrsCached, true);
         }
         else if (fCaps & SUPVTCAPS_AMD_V)
         {
             g_HwvirtMsrs.u.svm.u64MsrHwcr = ASMRdMsr(MSR_K8_HWCR);
-            g_fHwvirtMsrsCached = true;
+            ASMAtomicWriteBool(&g_fHwvirtMsrsCached, true);
         }
         else