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From: David Matlack <dmatlack@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Jim Mattson <jmattson@google.com>, kvm@vger.kernel.org
Subject: Re: [kvm-unit-tests PATCH v2 0/3] Regression test for L1 LDTR persistence bug
Date: Mon, 29 Nov 2021 14:19:36 -0800	[thread overview]
Message-ID: <CALzav=c63DpoBYzhkWeU20tiiH7uv1HfsUaM=RFTuAWOZSybMg@mail.gmail.com> (raw)
In-Reply-To: <ec57f5d2-f3bb-1fa6-bcdf-9217608756f5@redhat.com>

On Wed, Nov 10, 2021 at 1:45 PM Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 10/15/21 21:55, Jim Mattson wrote:
> > This issue is significant enough that it warrants a regression
> > test. Unfortunately, at the moment, the best we can do is check for
> > the LDTR persistence bug. I'd like to be able to trigger a
> > save/restore from within the L2 guest, but AFAICT, there's no way to
> > do that under qemu. Does anyone want to implement a qemu ISA test
> > device that triggers a save/restore when its configured I/O port is
> > written to?
>
> The selftests infrastructure already has save/restore tests at
> instruction granularity (state_test.c) so you should have more luck that
> way; these tests are worthwhile anyway.

There is also (I just discovered) support for guest-triggerable
migration in the kvm-unit-tests [1]. You could use that to trigger a
save/restore.

[1] Example: https://gitlab.com/kvm-unit-tests/kvm-unit-tests/-/blob/master/arm/gic.c#L798

>
> Paolo
>

  reply	other threads:[~2021-11-29 22:29 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-15 19:55 [kvm-unit-tests PATCH v2 0/3] Regression test for L1 LDTR persistence bug Jim Mattson
2021-10-15 19:55 ` [kvm-unit-tests PATCH v2 1/3] x86: Fix operand size for lldt Jim Mattson
2021-10-15 19:55 ` [kvm-unit-tests PATCH v2 2/3] x86: Make set_gdt_entry usable in 64-bit mode Jim Mattson
2021-10-15 19:55 ` [kvm-unit-tests PATCH v2 3/3] x86: Add a regression test for L1 LDTR persistence bug Jim Mattson
2021-11-10 19:50 ` [kvm-unit-tests PATCH v2 0/3] Regression " Jim Mattson
2021-11-10 21:44 ` Paolo Bonzini
2021-11-29 22:19   ` David Matlack [this message]
2021-11-30  8:42     ` Paolo Bonzini
2021-11-11 17:44 ` Paolo Bonzini

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