linux-kernel - Re: [PATCH RFC 04/15] KVM: Implement ring-based dirty memory tracking

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Message-ID: <c6d00ced-64ff-34af-99dd-abbcbac67836@redhat.com>
Date:   Tue, 17 Dec 2019 17:48:58 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     Christophe de Dinechin <dinechin@...hat.com>,
        Christophe de Dinechin <christophe.de.dinechin@...il.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH RFC 04/15] KVM: Implement ring-based dirty memory tracking

On 17/12/19 17:42, Peter Xu wrote:
> 
> However I just noticed something... Note that we still didn't read
> into non-x86 archs, I think it's the same question as when I asked
> whether we can unify the kvm[_vcpu]_write() interfaces and you'd like
> me to read the non-x86 archs - I think it's time I read them, because
> it's still possible that non-x86 archs will still need the per-vm
> ring... then that could be another problem if we want to at last
> spread the dirty ring idea outside of x86.

We can take a look, but I think based on x86 experience it's okay if we
restrict dirty ring to arches that do no VM-wide accesses.

Paolo