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[Qemu-devel] [Bug 1042561] Re: Guest has no "xsave" feature with paramet

From: Eduardo Habkost
Subject: [Qemu-devel] [Bug 1042561] Re: Guest has no "xsave" feature with parameter "-cpu qemu64, +xsave" in qemu command line.
Date: Mon, 16 Sep 2013 17:51:59 -0000

xsave needs level >= 13, and qemu64 has level=4. Try "-cpu

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

Status in QEMU:

Bug description:
  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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