Re: [PATCH v1 00/29] virtio-mem: Big Block Mode (BBM)

[David Hildenbrand]

> Am 18.10.2020 um 17:29 schrieb Michael S. Tsirkin <mst@xxxxxxxxxx>:
> 
> On 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 hypervisor
>> 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 the
>> driver). Of course, we want to support any device block size in any Linux
>> VM.
>> 
>> Bigger device block sizes will become especially important once supporting
>> 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.
> 
> 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‘ll resend based on linus‘ tree now that all prereqs are upstream.