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    SubjectRe: [BUG] kvm: guest can not startup due to triple fault
    On Mon, Oct 18, 2010 at 03:50:15PM +0200, Avi Kivity wrote:
    > On 10/18/2010 03:46 PM, Avi Kivity wrote:
    > > On 10/18/2010 03:45 PM, Dave Young wrote:
    > >>On Mon, Oct 18, 2010 at 03:26:30PM +0200, Avi Kivity wrote:
    > >>> On 10/18/2010 02:58 PM, Dave Young wrote:
    > >>> >>
    > >>> >> It's secondary_startup_64 enabling efer.sce and efer.nx.
    > >>> >>
    > >>> >> Dave, please post your /proc/cpuinfo. Is your host
    > >>running with NX
    > >>> >> disabled?
    > >>> >
    > >>> >I see nx bit in /proc/cpuinfo, Actually I don't know how to
    > >>disable it.
    > >>>
    > >>> Strange.
    > >>>
    > >>> Please patch arch/x86/kvm/x86.c to printk efer_reserved_bits (a
    > >>> global), efer (an argument) and old_efer (a local), and post the
    > >>> results.
    > >>
    > >>I add printk before kvm_mmu_reset_context(vcpu), correct? get
    > >>following value:
    > >>
    > >
    > >Add it at the beginning please, otherwise we'll miss the important
    > >one due to an early return.
    > >
    >
    > No need actually:
    >
    > >[ 3228.468325] efer_reserved_bits = 0xfffffffffffffafe
    >
    >
    > Bit 11 is reserved, so the guest can't enable nx.
    >
    > From arch/x86/kvm/vmx.c:
    > >static __init int hardware_setup(void)
    > >{
    > > if (setup_vmcs_config(&vmcs_config) < 0)
    > > return -EIO;
    > >
    > > if (boot_cpu_has(X86_FEATURE_NX))
    > > kvm_enable_efer_bits(EFER_NX);
    > >
    >
    > Please patch hardware_setup() to show the value of
    > boot_cpu_has(X86_FEATURE_NX).

    It's 0


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