Changeset 15390 in vbox

Timestamp:

Dec 12, 2008 5:33:23 PM (16 years ago)

Author:

vboxsync

Message:

X86_CPUID_AMD_FEATURE_EDX_SEP not set it seems in 32 bits mode. (Intel)

File:

• trunk/src/VBox/VMM/VMMAll/CPUMAllRegs.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/CPUMAllRegs.cpp

@@ -1358 +1358 @@
                 ||  !(ASMCpuId_EDX(0x80000001) & X86_CPUID_AMD_FEATURE_EDX_SEP))
             {
-                LogRel(("WARNING: Can't turn on SYSCALL/SYSRET when the host doesn't support it!!\n"));
-                return;
+#if HC_ARCH_BITS == 32
+                /* X86_CPUID_AMD_FEATURE_EDX_SEP not set it seems in 32 bits mode.
+                 * Even when the cpu is capable of doing so in 64 bits mode.
+                 */
+                if (    pVM->cpum.s.aGuestCpuIdExt[0].eax < 0x80000001
+                    ||  !(ASMCpuId_EDX(0x80000001) & X86_CPUID_AMD_FEATURE_EDX_LONG_MODE)
+                    ||  !(ASMCpuId_EDX(1) & X86_CPUID_FEATURE_EDX_SEP))
+#endif
+                {
+                    LogRel(("WARNING: Can't turn on SYSCALL/SYSRET when the host doesn't support it!!\n"));
+                    return;
+                }
             }
             /* Valid for both Intel and AMD CPUs, although only in 64 bits mode for Intel. */