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[Qemu-devel] Is qemu (version 1.0) support to emulate the CPU feture "x2


From: developer wang
Subject: [Qemu-devel] Is qemu (version 1.0) support to emulate the CPU feture "x2APIC"?
Date: Wed, 7 Mar 2012 21:54:28 +0800

Hi,

  I want to use qemu (version 1.0) to emulate guest systems with x2APIC enabled.
  But when I use qemu to emulate CPU's feture "x2APIC", I didn't find it in /proc/cpuinfo.
  And I saw the source code of qemu.
  I only find a single define (#define CPUID_EXE_X2APIC   (1<<21) )
  but no other places use this this define.
  Does this mean qemu now doesn't support to emulate the CPU's feture of "x2APIC"?
 

  Our host machine is running Debian 6, and the host system has x2APIC support.

  I use the following command to run qemu:

    qemu-system-x86_64 -nographic -cpu qemu64,+x2apic -serial mon:/dev/tty -hda ~/debian6.qcow2

After the guest (also Debian 6) boots up, I can't see x2apic in /proc/cpuinfo.

Our host machine's CPU features:

    model name      : Intel(R) Xeon(R) CPU E7- 4850  @ 2.00GHz
    flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 x2apic popcnt aes lahf_lm ida arat dts tpr_shadow vnmi flexpriority ept vpid

The CPU feature from the guest emulated by QEMU:

    model name      : QEMU Virtual CPU version 1.0,1
    flags           : fpu pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm up pni cx16 popcnt hypervisor lahf_lm svm abm sse4a

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