Commit-ID: 5fffd63db1260fb56a3ed37cf2bbc5f901fcbad4
Gitweb: http://git.kernel.org/tip/5fffd63db1260fb56a3ed37cf2bbc5f901fcbad4
Author: Sasha Levin <levinsasha928@xxxxxxxxx>
AuthorDate: Wed, 20 Jun 2012 11:37:39 +0400
Committer: Pekka Enberg <penberg@xxxxxxxxxx>
CommitDate: Wed, 20 Jun 2012 10:41:10 +0300
kvm tools: set the HYPERVISOR flag in cpuid
We need to set the HYPERVISOR flag to let the kernel know we're running
under a hypervisor.
This makes the kernel enable all sorts of para-virtualization options
such as kvm-clock.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
[gorcunov@: Add comments on bits]
Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxx>
---
tools/kvm/x86/cpuid.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/tools/kvm/x86/cpuid.c b/tools/kvm/x86/cpuid.c
index 75f3b4d..4c140f0 100644
--- a/tools/kvm/x86/cpuid.c
+++ b/tools/kvm/x86/cpuid.c
@@ -21,8 +21,13 @@ static void filter_cpuid(struct kvm_cpuid2 *kvm_cpuid)
struct kvm_cpuid_entry2 *entry = &kvm_cpuid->entries[i];
switch (entry->function) {
+ case 1:
+ /* Set X86_FEATURE_HYPERVISOR */
+ if (entry->index == 0)
+ entry->ecx |= (1 << 31);
+ break;
case 6:
- /* Clear presence of IA32_ENERGY_PERF_BIAS */
+ /* Clear X86_FEATURE_EPB */
entry->ecx = entry->ecx & ~(1 << 3);
break;
case CPUID_FUNC_PERFMON:
--
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