linux-kernel - Re: [PATCH 6/6] KVM: selftests: Add memslot modification stress test

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Message-ID: <YAIu+7qu5OTRZXsT@google.com>
Date:   Fri, 15 Jan 2021 16:10:35 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Andrew Jones <drjones@...hat.com>,
        Peter Shier <pshier@...gle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Thomas Huth <thuth@...hat.com>, Jacob Xu <jacobhxu@...gle.com>,
        Makarand Sonare <makarandsonare@...gle.com>
Subject: Re: [PATCH 6/6] KVM: selftests: Add memslot modification stress test

On Tue, Jan 12, 2021, Ben Gardon wrote:
> Add a memslot modification stress test in which a memslot is repeatedly
> created and removed while vCPUs access memory in another memslot. Most
> userspaces do not create or remove memslots on running VMs which makes
> it hard to test races in adding and removing memslots without a
> dedicated test. Adding and removing a memslot also has the effect of
> tearing down the entire paging structure, which leads to more page
> faults and pressure on the page fault handling path than a one-and-done
> memory population test.

Would it make sense to integrate this with set_memory_region_test?  At a high
level, they are doing very similar things.  Not sure how much code can be shared,
but I assume there's some amount of overlap.