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    SubjectRe: qemu-kvm loops after kernel udpate
    On 09/12/2012 10:06 AM, Avi Kivity wrote:
    > On 09/11/2012 10:41 PM, Jiri Slaby wrote:
    >> On 09/11/2012 09:03 PM, Marcelo Tosatti wrote:
    >>> On Tue, Sep 11, 2012 at 08:11:36PM +0200, Jiri Slaby wrote:
    >>>> Hi,
    >>>> it looks like an update from next-20120824 to next-20120910 makes kvm
    >>>> defunct. When I try to run qemu, it loops forever without printing
    >>>> anything on the monitor.
    >>>> -no-kvm makes it indeed work.
    >>>> Cmdline I use:
    >>>> qemu-kvm -k en-us -usbdevice tablet -balloon virtio -hda IMAGE -smp 2 -m
    >>>> 1000M -net user -net nic,model=e1000 -usb -serial pty
    >>>> Before I start investigating further, like biscection, is this a known
    >>>> issue already and fix available somewhere?
    >>> Its not a known issue. 'info registers' (for both vcpus) and
    >>> 'x /20i $eip' might help track it down.
    >> I don't think it's in a state with something loaded.
    >> (qemu) cpu 0
    >> (qemu) info registers
    >> EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000623
    >> ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
    >> EIP=0000fff0 EFL=00010002 [-------] CPL=3 II=0 A20=1 SMM=0 HLT=0
    >> ES =0000 00000000 0000ffff 00009300
    >> CS =f000 000f0000 0000ffff 0000f300
    > This is before the first instruction is executed.
    > You're on an Intel host, yes?


    processor : 1
    vendor_id : GenuineIntel
    cpu family : 6
    model : 15
    model name : Intel(R) Core(TM)2 Duo CPU E6850 @ 3.00GHz
    stepping : 11
    microcode : 0xba
    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 lm constant_tsc arch_perfmon pebs bts nopl aperfmperf pni
    dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm lahf_lm
    dtherm tpr_shadow vnmi flexpriority

    > Please provide the output of vmxcap
    > (,

    pin-based controls
    External interrupt exiting yes
    NMI exiting yes
    Virtual NMIs yes
    Activate VMX-preemption timer no
    primary processor-based controls
    Interrupt window exiting yes
    Use TSC offsetting yes
    HLT exiting yes
    INVLPG exiting yes
    MWAIT exiting yes
    RDPMC exiting yes
    RDTSC exiting yes
    CR3-load exiting forced
    CR3-store exiting forced
    CR8-load exiting yes
    CR8-store exiting yes
    Use TPR shadow yes
    NMI-window exiting yes
    MOV-DR exiting yes
    Unconditional I/O exiting yes
    Use I/O bitmaps yes
    Monitor trap flag no
    Use MSR bitmaps yes
    MONITOR exiting yes
    PAUSE exiting yes
    Activate secondary control yes
    secondary processor-based controls
    Virtualize APIC accesses yes
    Enable EPT no
    Descriptor-table exiting no
    Virtualize x2APIC mode no
    Enable VPID no
    WBINVD exiting no
    Unrestricted guest no
    PAUSE-loop exiting no
    RDRAND exiting no
    Enable INVPCID no
    Enable VM functions no
    VM-Exit controls
    Save debug controls forced
    Host address-space size yes
    Acknowledge interrupt on exit yes
    Save IA32_PAT no
    Load IA32_PAT no
    Save IA32_EFER no
    Load IA32_EFER no
    Save VMX-preemption timer value no
    VM-Entry controls
    Load debug controls forced
    IA-64 mode guest yes
    Entry to SMM yes
    Deactivate dual-monitor treatment yes
    Load IA32_PAT no
    Load IA32_EFER no
    Miscellaneous data
    VMX-preemption timer scale (log2) 0
    Store EFER.LMA into IA-32e mode guest control no
    HLT activity state yes
    Shutdown activity state yes
    Wait-for-SIPI activity state yes
    Number of CR3-target values 4
    MSR-load/store count recommenation 0
    IA32_SMM_MONITOR_CTL[2] can be set to 1 no
    MSEG revision identifier 0
    VPID and EPT capabilities
    Execute-only EPT translations no
    Page-walk length 4 no
    Paging-structure memory type UC no
    Paging-structure memory type WB no
    2MB EPT pages no
    1GB EPT pages no
    INVEPT supported no
    EPT accessed and dirty flags no
    Single-context INVEPT no
    All-context INVEPT no
    INVVPID supported no
    Individual-address INVVPID no
    Single-context INVVPID no
    All-context INVVPID no
    Single-context-retaining-globals INVVPID no
    VM Functions
    EPTP Switching no

    > and a snapshot of kvm_stat while the guest is hung.

    kvm statistics

    exits 6778198 615942
    host_state_reload 1988 187
    irq_exits 1523 138
    mmu_cache_miss 4 0
    fpu_reload 1 0

    suse labs

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