linux-kernel - Re: qemu-x86_64 compat: LTP: controllers: RIP: 0010:__alloc

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Date:   Thu, 25 May 2023 17:52:10 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-stable <stable@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, LTP List <ltp@...ts.linux.it>,
        lkft-triage@...ts.linaro.org, X86 ML <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Anders Roxell <anders.roxell@...aro.org>
Subject: Re: qemu-x86_64 compat: LTP: controllers: RIP: 0010:__alloc_pages

On Thu, 25 May 2023 at 02:03, Arnd Bergmann <arnd@...db.de> wrote:
>
> On Wed, May 24, 2023, at 19:54, Peter Zijlstra wrote:
> > On Wed, May 24, 2023 at 09:39:50PM +0530, Naresh Kamboju wrote:
> >> FYI,
> >> These are running in AWS cloud as qemu-i386 and qemu-x86_64.
> >
> > Are these hosted on x86 and using KVM or are they hosted on Graviton and
> > using TCG x86 ?
> >
> > Supposedly TCG x86 is known 'funny' and if that's what you're using it
> > would be very good to confirm the problem on x86 hardware.

I see the following logs while booting.

<3>[    1.834686] kvm_intel: VMX not supported by CPU 0
<3>[    1.835860] kvm_amd: SVM not supported by CPU 0, not amd or hygon

And they are running on x86 machines.

>
> Even on x86 cloud instances you are likely to run with TCG if
> the host does not support nested virtualization. So the question
> really is what specific cloud instance type this was running
> on, and if KVM was actually used or not.  From what I could
> find on the web, Amazon EC2 only supports KVM guests inside of
> bare-metal instances but not any of the normal virtualized ones,
> while other providers using KVM (Google, Microsoft, ...) do support
> nested guests.
>
>       Arnd