diff options
| author | Daniel P. Berrange <berrange@redhat.com> | 2017-05-09 14:27:36 +0100 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2017-07-17 15:41:30 -0300 |
| commit | 1ce36bfe6424243082d3d7c2330e1a0a4ff72a43 (patch) | |
| tree | c58746657db8a709970e935c9fcaa9b43c5ba903 /target/i386/cpu.h | |
| parent | 39736e18cda64c501caab00d93ebfd8b4cf6b36e (diff) | |
i386: expose "TCGTCGTCGTCG" in the 0x40000000 CPUID leaf
Currently when running KVM, we expose "KVMKVMKVM\0\0\0" in
the 0x40000000 CPUID leaf. Other hypervisors (VMWare,
HyperV, Xen, BHyve) all do the same thing, which leaves
TCG as the odd one out.
The CPUID signature is used by software to detect which
virtual environment they are running in and (potentially)
change behaviour in certain ways. For example, systemd
supports a ConditionVirtualization= setting in unit files.
The virt-what command can also report the virt type it is
running on
Currently both these apps have to resort to custom hacks
like looking for 'fw-cfg' entry in the /proc/device-tree
file to identify TCG.
This change thus proposes a signature "TCGTCGTCGTCG" to be
reported when running under TCG.
To hide this, the -cpu option tcg-cpuid=off can be used.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <20170509132736.10071-3-berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'target/i386/cpu.h')
| -rw-r--r-- | target/i386/cpu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 7a228afd04..051867399b 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1218,6 +1218,7 @@ struct X86CPU { bool check_cpuid; bool enforce_cpuid; bool expose_kvm; + bool expose_tcg; bool migratable; bool max_features; /* Enable all supported features automatically */ uint32_t apic_id; |