Hi, yes I double checked the patch and it's applied correctly.
Here you can find my config.
CONFIG_DEBUG_STACKOVERFLOW is disabled.
I can't get the uart on this system, is there any other way to catch log in
this scenario?
Why should I test the 4.4.y? 4.9.146 works fine on the same system (with
the same guest). Did I miss something?
R.
Il ven 5 apr 2019, 10:14 Jan Kiszka <jan.kis...@siemens.com> ha scritto:
> On 05.04.19 08:20, cagnulein wrote:
> > Hi Jan, thanks for your patch.
> > I've just tried but I have the same issue: I start a kvm guest (windows
> 10 iot
> > 2019) and it works, but when I start a latency test the whole system
> hangs
> > completely.
> >
> > Could i give you more info in some way?
>
> OK... First question: Are you sure the patch was applied to the kernel
> you tested? Just to double-check a common mistake.
>
> Then, there are no debug messages on the uart at all when the system
> locks up? What is your kernel config?
>
> Next, please try with ipipe-4.4.y and this change:
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 2d480a64e172..0a1929dca183 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -8453,6 +8453,10 @@ static void vmx_handle_external_intr(struct
> kvm_vcpu *vcpu)
> unsigned long tmp;
> #endif
>
> +#ifdef CONFIG_IPIPE
> + __clear_bit(IPIPE_STALL_FLAG,
> + &ipipe_this_cpu_root_context()->status);
> +#endif
> vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
> desc = (gate_desc *)vmx->host_idt_base + vector;
> entry = gate_offset(*desc);
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index f895d4e0eb3e..e6863bd226e6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6639,6 +6639,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
> || need_resched() || signal_pending(current)) {
> vcpu->mode = OUTSIDE_GUEST_MODE;
> smp_wmb();
> + __ipipe_exit_vm();
> hard_cond_local_irq_enable();
> local_irq_enable();
> preempt_enable();
>
> Just make sure to have CONFIG_DEBUG_STACKOVERFLOW disabled (I just
> discovered a compilation issue on that kernel version).
>
> Jan
>
> --
> Siemens AG, Corporate Technology, CT RDA IOT SES-DE
> Corporate Competence Center Embedded Linux
>
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