[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Laurent COUSTET]

I had exactly the same problem using custom kernel on Debian GNU/Linux /
qemu-kvm 1.1.1 or 1.2.0.

CPU: Intel(R) Xeon(R) CPU E5-2667 0 @ 2.90GHz stepping 7 microcode 0x70b

I have two solutions: (VERY UGGLY) patch the kernel to remove intel perf
events (hardware events):

--- ../linux-3.4.10-fai-server/arch/x86/kernel/cpu/perf_event.c 2012-08-27 
00:02:10.000000000 +0200
+++ arch/x86/kernel/cpu/perf_event.c    2012-09-10 18:56:11.870774243 +0200
@@ -1324,7 +1328,8 @@
        struct event_constraint *c;
        int err;
 
-       pr_info("Performance Events: ");
+       pr_info("Performance Events: (DISABLED BY UGGLY PATCH)");
+       return 0;
 
        switch (boot_cpu_data.x86_vendor) {
        case X86_VENDOR_INTEL:


*OR*

Add support for KVM Guest in the *GUEST* kernel config:


+CONFIG_KVM_CLOCK=y
+CONFIG_KVM_GUEST=y
+CONFIG_PARAVIRT=y
+# CONFIG_PARAVIRT_SPINLOCKS is not set
+CONFIG_PARAVIRT_CLOCK=y

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https://bugs.launchpad.net/bugs/1037675

Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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