virt: enable detecting QEMU (TCG) via CPUID (#6399)

QEMU >= 2.10 will include a CPUID leaf with value "TCGTCGTCGTCG"
on x86 when running with the TCG CPU emulator:

  https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg05231.html

Existing methods of detecting QEMU are left unchanged for sake of
backcompatibility.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

diff --git a/src/basic/virt.c b/src/basic/virt.c
index 0060bb84602dc4c6aa98b53df4e41626ad3418d7..a8f1652d2cc3bc65443dc6937195318177e31a63 100644 (file)
--- a/src/basic/virt.c
+++ b/src/basic/virt.c
@@ -46,6 +46,7 @@ static int detect_vm_cpuid(void) {
         } cpuid_vendor_table[] = {
                 { "XenVMMXenVMM", VIRTUALIZATION_XEN       },
                 { "KVMKVMKVM",    VIRTUALIZATION_KVM       },
+                { "TCGTCGTCGTCG", VIRTUALIZATION_QEMU      },
                 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
                 { "VMwareVMware", VIRTUALIZATION_VMWARE    },
                 /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */