linux-kernel - Re: [PATCH v3 00/21] KVM: Dirty ring interface

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Date:   Thu, 9 Jan 2020 21:42:40 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Peter Xu <peterx@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christophe de Dinechin <dinechin@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Yan Zhao <yan.y.zhao@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Kevin Kevin <kevin.tian@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>
Subject: Re: [PATCH v3 00/21] KVM: Dirty ring interface

On 09/01/20 20:39, Peter Xu wrote:
>>
>> IIUC at the moment KVM never uses huge pages if any part of the huge page is
>> tracked.
>
> To be more precise - I think it's per-memslot.  Say, if the memslot is
> dirty tracked, then no huge page on the host on that memslot (even if
> guest used huge page over that).
> 
>> But if all parts of the page are written to then huge page
>> is used.
>
> I'm not sure of this... I think it's still in 4K granularity.

Right.  Dirty tracking always uses 4K page size.

Paolo