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From:   David Hildenbrand <david@redhat.com>
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Subject: Re: [PATCH v1 00/29] virtio-mem: Big Block Mode (BBM)
Date:   Sun, 18 Oct 2020 18:34:21 +0200
Message-Id: <ED93C2B5-67F0-4FFA-8FF1-4545B86456FA@redhat.com>
References: <20201018112849-mutt-send-email-mst@kernel.org>
Cc:     David Hildenbrand <david@redhat.com>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, virtualization@lists.linux-foundation.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Jason Wang <jasowang@redhat.com>,
        Michal Hocko <mhocko@kernel.org>,
        Oscar Salvador <osalvador@suse.de>,
        Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
        Wei Yang <richard.weiyang@linux.alibaba.com>
In-Reply-To: <20201018112849-mutt-send-email-mst@kernel.org>
To:     "Michael S. Tsirkin" <mst@redhat.com>
Precedence: bulk


> Am 18.10.2020 um 17:29 schrieb Michael S. Tsirkin <mst@redhat.com>:
>=20
> =EF=BB=BFOn Mon, Oct 12, 2020 at 02:52:54PM +0200, David Hildenbrand wrote=
:
>> virtio-mem currently only supports device block sizes that span at most
>> a single Linux memory block. For example, gigantic pages in the hyperviso=
r
>> result on x86-64 in a device block size of 1 GiB - when the Linux memory
>> block size is 128 MiB, we cannot support such devices (we fail loading th=
e
>> driver). Of course, we want to support any device block size in any Linux=

>> VM.
>>=20
>> Bigger device block sizes will become especially important once supportin=
g
>> VFIO in QEMU - each device block has to be mapped separately, and the
>> maximum number of mappings for VFIO is 64k. So we usually want blocks in
>> the gigabyte range when wanting to grow the VM big.
>=20
> I guess it missed this Linux right? There's an mm change which did not
> get an ack from mm mainatiners, so I can't merge it ...

No issue, I was targeting 5.11 either way! I=E2=80=98ll resend based on linu=
s=E2=80=98 tree now that all prereqs are upstream.=