linux-kernel - Re: [RFCv1 7/7] KVM: unmap guest memory using poisoned pages

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Message-ID: <87v98yuo3z.fsf@linux.intel.com>
Date:   Wed, 07 Apr 2021 08:10:40 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        "Edgecombe\, Rick P" <rick.p.edgecombe@...el.com>,
        "Kleen\, Andi" <andi.kleen@...el.com>,
        "Yamahata\, Isaku" <isaku.yamahata@...el.com>, x86@...nel.org,
        kvm@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Oscar Salvador <osalvador@...e.de>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: Re: [RFCv1 7/7] KVM: unmap guest memory using poisoned pages

David Hildenbrand <david@...hat.com> writes:

> I have no idea how expensive would be bouncing writes (and reads?)
> through the kernel. Did you ever experiment with that/evaluate that?

I would expect it to be quite expensive, as in virtio IO performance
tanking.

-Andi