linux-kernel - Re: [PATCH RFC v4 00/13] virtio-mem: paravirtualized memory

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Date:   Fri, 5 Jun 2020 14:18:28 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Alex Shi <alex.shi@...ux.alibaba.com>, linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, virtio-dev@...ts.oasis-open.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Sebastien Boeuf <sebastien.boeuf@...el.com>,
        Samuel Ortiz <samuel.ortiz@...el.com>,
        Robert Bradford <robert.bradford@...el.com>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Alexander Potapenko <glider@...gle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Anthony Yznaga <anthony.yznaga@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Young <dyoung@...hat.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Juergen Gross <jgross@...e.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Len Brown <lenb@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Oscar Salvador <osalvador@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Pingfan Liu <kernelfans@...il.com>, Qian Cai <cai@....pw>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Wei Yang <richard.weiyang@...il.com>
Subject: Re: [PATCH RFC v4 00/13] virtio-mem: paravirtualized memory

On 05.06.20 12:46, Alex Shi wrote:
> 
> 
> 在 2020/6/5 下午6:05, David Hildenbrand 写道:
>>> I guess I know what's happening here. In case we only have DMA memory
>>> when booting, we don't reserve swiotlb buffers. Once we hotplug memory
>>> and online ZONE_NORMAL, we don't have any swiotlb DMA bounce buffers to
>>> map such PFNs (total 0 (slots), used 0 (slots)).
>>>
>>> Can you try with "swiotlb=force" on the kernel cmdline?
>> Alternative, looks like you can specify "-m 2G,maxmem=16G,slots=1", to
>> create proper ACPI tables that indicate hotpluggable memory. (I'll have
>> to look into QEMU to figure out to always indicate hotpluggable memory
>> that way).
>>
> 
> 
> That works too. Yes, better resolved in qemu, maybe. :)
> 

You can checkout

git@...hub.com:davidhildenbrand/qemu.git virtio-mem-v4

(prone to change before officially sent), which will create srat tables
also if no "slots" parameter was defined (and no -numa config was
specified).

Your original example should work with that.

-- 
Thanks,

David / dhildenb