[Xen-changelog] [xen-unstable] x86, hvm: Make host TscInvariant CPUID flag visible to guest by default.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1257792867 0
# Node ID e8483c7f668d9e2699c22a6502ffe20123a9ef45
# Parent  42e268da38b961ed8b9edf02308a8a85d4456bf3
x86, hvm: Make host TscInvariant CPUID flag visible to guest by default.

Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 tools/libxc/xc_cpuid_x86.c |    8 ++++++++
 1 files changed, 8 insertions(+)

diff -r 42e268da38b9 -r e8483c7f668d tools/libxc/xc_cpuid_x86.c
--- a/tools/libxc/xc_cpuid_x86.c        Mon Nov 09 08:19:55 2009 +0000
+++ b/tools/libxc/xc_cpuid_x86.c        Mon Nov 09 18:54:27 2009 +0000
@@ -224,6 +224,14 @@ static void xc_cpuid_hvm_policy(
             clear_bit(X86_FEATURE_NX, regs[3]);
         break;
 
+    case 0x80000007:
+        /*
+         * Keep only TSCInvariant. This may be cleared by the hypervisor
+         * depending on guest TSC and migration settings.
+         */
+        regs[0] = regs[1] = regs[2] = 0;
+        regs[3] &= 1u<<8;
+        break;
 
     case 0x80000008:
         regs[0] &= 0x0000ffffu;

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