Messages in this thread | | | Date | Mon, 18 Oct 2010 15:50:15 +0200 | From | Avi Kivity <> | Subject | Re: [BUG] kvm: guest can not startup due to triple fault |
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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).
-- error compiling committee.c: too many arguments to function
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