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[79.242.51.208]) by smtp.gmail.com with ESMTPSA id v14sm7677245ejh.6.2020.10.18.09.34.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 18 Oct 2020 09:34:22 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: David Hildenbrand Mime-Version: 1.0 (1.0) Subject: Re: [PATCH v1 00/29] virtio-mem: Big Block Mode (BBM) Date: Sun, 18 Oct 2020 18:34:21 +0200 Message-Id: References: <20201018112849-mutt-send-email-mst@kernel.org> Cc: David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Andrew Morton , Jason Wang , Michal Hocko , Oscar Salvador , Pankaj Gupta , Wei Yang In-Reply-To: <20201018112849-mutt-send-email-mst@kernel.org> To: "Michael S. Tsirkin" X-Mailer: iPhone Mail (18A393) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Am 18.10.2020 um 17:29 schrieb Michael S. Tsirkin : >=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.=