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authorDaniel P. Berrange <berrange@redhat.com>2017-05-09 14:27:36 +0100
committerEduardo Habkost <ehabkost@redhat.com>2017-07-17 15:41:30 -0300
commit1ce36bfe6424243082d3d7c2330e1a0a4ff72a43 (patch)
treec58746657db8a709970e935c9fcaa9b43c5ba903 /include
parent39736e18cda64c501caab00d93ebfd8b4cf6b36e (diff)
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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 'include')
-rw-r--r--include/hw/i386/pc.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index f48d167..d80859b 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -380,6 +380,11 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
#define PC_COMPAT_2_8 \
HW_COMPAT_2_8 \
{\
+ .driver = TYPE_X86_CPU,\
+ .property = "tcg-cpuid",\
+ .value = "off",\
+ },\
+ {\
.driver = "kvmclock",\
.property = "x-mach-use-reliable-get-clock",\
.value = "off",\