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Re: [PATCH v2] target/i386: seg_helper: Correct segement selector nullif

From: Bin Meng
Subject: Re: [PATCH v2] target/i386: seg_helper: Correct segement selector nullification in the RET/IRET helper
Date: Tue, 24 Nov 2020 14:09:24 +0800

Hi Paolo,

On Tue, Nov 17, 2020 at 7:06 PM Paolo Bonzini <pbonzini@redhat.com> wrote:
> On 17/11/20 11:08, Bin Meng wrote:
> >> I see.  Is there any chance you could write a testcase for
> >> kvm-unit-tests?  Or just explain how to write such a test, and then I
> >> can write it myself; it's not clear to me how the guest can observe the
> >> base and limit of a non-present segment.
> >
> > I am not familiar with kvm-unit-test. The original issue cannot be
> > reproduced with a KVM enabled QEMU as the codes-in-flaw is in the
> > emulation path.
> kvm-unit-tests, despite the name, is a set generic tests for CPU
> behavior; it works with other accelerators that QEMU supports including
> the emulation path.  You can find it at
> https://gitlab.com/kvm-unit-tests/kvm-unit-tests.

I see. Thanks for the info.

> If you explain in enough detail how VxWorks triggers the bug, I can take
> care of writing the test.

I will try to create a test case using the kvm-unit-tests framework.


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