From: Ben Gardon <bgardon@google.com>
To: "Maciej S. Szmigiero" <maciej.szmigiero@oracle.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Peter Shier <pshier@google.com>, Leo Hou <leohou1402@gmail.com>,
LKML <linux-kernel@vger.kernel.org>, kvm <kvm@vger.kernel.org>,
Sean Christopherson <seanjc@google.com>
Subject: Re: [PATCH 2/3] kvm: x86/mmu: Ensure TDP MMU roots are freed after yield
Date: Wed, 6 Jan 2021 09:56:20 -0800 [thread overview]
Message-ID: <CANgfPd_jJmFT_ZLW9M0=AMP8fH9JnA2Jm1aymOwPBfnbL6odSw@mail.gmail.com> (raw)
In-Reply-To: <4471c5e6-16a1-65c4-aa59-185091a2ebbc@oracle.com>
On Wed, Jan 6, 2021 at 9:37 AM Maciej S. Szmigiero
<maciej.szmigiero@oracle.com> wrote:
>
> On 06.01.2021 18:28, Ben Gardon wrote:
> > On Wed, Jan 6, 2021 at 1:26 AM Maciej S. Szmigiero
> > <maciej.szmigiero@oracle.com> wrote:
> >>
> >> Thanks for looking at it Ben.
> >>
> >> On 06.01.2021 00:38, Ben Gardon wrote:
> >> (..)
> >>>
> >>> +Sean Christopherson, for whom I used a stale email address.
> >>> .
> >>> I tested this series by running kvm-unit-tests on an Intel Skylake
> >>> machine. It did not introduce any new failures. I also ran the
> >>> set_memory_region_test
> >>
> >> It's "memslot_move_test" that is crashing the kernel - a memslot
> >> move test based on "set_memory_region_test".
> >
> > I apologize if I'm being very dense, but I can't find this test
> > anywhere.
>
> No problem, the reproducer is available here:
> https://gist.github.com/maciejsszmigiero/890218151c242d99f63ea0825334c6c0
> as I stated in my original report.
Ah, that makes sense now. I didn't realize there were more files below
the .config. I added your test and can now reproduce the issue!
>
> > Is this something you have in-house but haven't upstreamed
> > or just the test_move_memory_region(); testcase from
> > set_memory_region_test? I have a similar memslot-moving-stress-test in
> > the pipeline I need to send out, but I didn't think such a test
> > existed yet and my test hadn't caught this issue.
>
> The reproducer at that GitHub link is taken from my KVM memslot
> test mini-set, itself based on set_memory_region_test.c from
> KVM selftests.
> The full mini-set will be posted as soon as I finish it :)
Awesome, thank you for writing this test!
>
> Thanks,
> Maciej
next prev parent reply other threads:[~2021-01-06 17:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-05 23:31 [PATCH 1/3] kvm: x86/mmu: Clarify TDP MMU page list invariants Ben Gardon
2021-01-05 23:31 ` [PATCH 2/3] kvm: x86/mmu: Ensure TDP MMU roots are freed after yield Ben Gardon
2021-01-05 23:38 ` Ben Gardon
2021-01-06 9:26 ` Maciej S. Szmigiero
2021-01-06 17:28 ` Ben Gardon
2021-01-06 17:37 ` Maciej S. Szmigiero
2021-01-06 17:56 ` Ben Gardon [this message]
2021-01-06 18:02 ` Maciej S. Szmigiero
2021-01-05 23:31 ` [PATCH 3/3] kvm: x86/mmu: Get/put TDP MMU root refs in iterator Ben Gardon
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