[Qemu-devel] [Bug 1042561] [NEW] Guest has no "xsave" feature with parameter "-cpu qemu64, +xsave" in qemu command line.

[Yongjie Ren]

Public bug reported:

Environment:
------------
Host OS (ia32/ia32e/IA64):ia32e
Guest OS (ia32/ia32e/IA64):ia32e
Guest OS Type (Linux/Windows):Linux
kvm.git Commit:1a577b72475d161b6677c05abe57301362023bb2
qemu-kvm Commit:98f1f30a89901c416e51cc70c1a08d9dc15a2ad4
Host Kernel Version:3.5.0-rc1
Hardware:Romley-EP, Ivy-bridge


Bug detailed description:
--------------------------
Guest has no "xsave" feature when create guest with parameter "-cpu 
qemu64,+xsave,+avx" in qemu command line, but the guest has avx feature.
When starting a guest with parameter "-cpu host" in qemu command line, the 
guest has 'avx' and 'xsave' features (as /proc/cpuinfo shows).

This is not a recent regression; it exists for a long time.

Reproduce steps:
----------------
1. qemu-system-x86_64 -m 1024 -smp 2 -hda rhel6u3.img -cpu qemu64,+xsave
2. cat /proc/cpuinfo | grep xsave     ( check guest's xsave feature)

Current result:
----------------
The guest has no xsave feature

Expected result:
----------------
The guest has xsave feature

Basic root-causing log:

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1042561

Title:
  Guest has no "xsave" feature with parameter "-cpu qemu64,+xsave" in
  qemu command line.

Status in QEMU:
  New

Bug description:
  Environment:
  ------------
  Host OS (ia32/ia32e/IA64):ia32e
  Guest OS (ia32/ia32e/IA64):ia32e
  Guest OS Type (Linux/Windows):Linux
  kvm.git Commit:1a577b72475d161b6677c05abe57301362023bb2
  qemu-kvm Commit:98f1f30a89901c416e51cc70c1a08d9dc15a2ad4
  Host Kernel Version:3.5.0-rc1
  Hardware:Romley-EP, Ivy-bridge

  
  Bug detailed description:
  --------------------------
  Guest has no "xsave" feature when create guest with parameter "-cpu 
qemu64,+xsave,+avx" in qemu command line, but the guest has avx feature.
  When starting a guest with parameter "-cpu host" in qemu command line, the 
guest has 'avx' and 'xsave' features (as /proc/cpuinfo shows).

  This is not a recent regression; it exists for a long time.

  Reproduce steps:
  ----------------
  1. qemu-system-x86_64 -m 1024 -smp 2 -hda rhel6u3.img -cpu qemu64,+xsave
  2. cat /proc/cpuinfo | grep xsave     ( check guest's xsave feature)

  Current result:
  ----------------
  The guest has no xsave feature

  Expected result:
  ----------------
  The guest has xsave feature

  Basic root-causing log:

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