From: "Ling, Xiaofeng" <xiaofeng.ling@intel.com>
To: xen-devel <xen-devel@lists.xensource.com>
Subject: [PATCH] hide 64bit mode
Date: Fri, 16 Dec 2005 15:33:30 +0800 [thread overview]
Message-ID: <43A26DCA.9070809@intel.com> (raw)
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hide 64bit mode on i386 hypervisor and guest.
Signed-off-by: Xiaofeng Ling <xiaofeng.ling@intel.com>
[-- Attachment #2: cpuidem64t.patch --]
[-- Type: text/x-patch, Size: 851 bytes --]
# HG changeset patch
# User Xiaofeng Ling <xiaofeng.ling@intel.com>
# Node ID 24f89f563f46b72382731e692d702b1e629201f0
# Parent e035a8b7cfcc5e9d581da7df380d5107310e6a6b
hide 64bit mode on an i386 guest.
Signed-off-by: Xiaofeng Ling <xiaofeng.ling@intel.com>
diff -r e035a8b7cfcc -r 24f89f563f46 xen/arch/x86/vmx.c
--- a/xen/arch/x86/vmx.c Fri Dec 16 06:10:48 2005 +0800
+++ b/xen/arch/x86/vmx.c Fri Dec 16 15:05:43 2005 +0800
@@ -553,6 +553,13 @@
ecx &= ~VMX_VCPU_CPUID_L1_RESERVED; /* mask off reserved bits */
clear_bit(X86_FEATURE_VMXE & 31, &ecx);
clear_bit(X86_FEATURE_MWAIT & 31, &ecx);
+#ifdef __i386__
+ }
+ else if (input == 0x80000001)
+ {
+ /* mask feature for Intel ia32e or AMD long mode*/
+ clear_bit(X86_FEATURE_LM & 31, &edx);
+#endif
}
regs->eax = (unsigned long) eax;
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