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SubjectRe: [PATCH RFC v4 00/13] virtio-mem: paravirtualized memory
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在 2020/1/9 下午9:48, David Hildenbrand 写道:
> Ping,
>
> I'd love to get some feedback on
>
> a) The remaining MM bits from MM folks (especially, patch #6 and #8).
> b) The general virtio infrastructure (esp. uapi in patch #2) from virtio
> folks.
>
> I'm planning to send a proper v1 (!RFC) once I have all necessary MM
> acks. In the meanwhile, I will do more testing and minor reworks (e.g.,
> fix !CONFIG_NUMA compilation).


Hi David,

Thanks for your work!

I am trying your https://github.com/davidhildenbrand/linux.git virtio-mem-v5
which works fine for me, but just a 'DMA error' happens when a vm start with
less than 2GB memory, Do I missed sth?

Thanks
Alex


(qemu) qom-set vm0 requested-size 1g
(qemu) [ 26.560026] virtio_mem virtio0: plugged size: 0x0
[ 26.560648] virtio_mem virtio0: requested size: 0x40000000
[ 26.561730] systemd-journald[167]: no db file to read /run/udev/data/+virtio:virtio0: No such file or directory
[ 26.563138] systemd-journald[167]: no db file to read /run/udev/data/+virtio:virtio0: No such file or directory
[ 26.569122] Built 1 zonelists, mobility grouping on. Total pages: 513141
[ 26.570039] Policy zone: Normal

(qemu) [ 32.175838] e1000 0000:00:03.0: swiotlb buffer is full (sz: 81 bytes), total 0 (slots), used 0 (slots)
[ 32.176922] e1000 0000:00:03.0: TX DMA map failed
[ 32.177488] e1000 0000:00:03.0: swiotlb buffer is full (sz: 81 bytes), total 0 (slots), used 0 (slots)
[ 32.178535] e1000 0000:00:03.0: TX DMA map failed

my qemu command is like this:
qemu-system-x86_64 --enable-kvm \
-m 2G,maxmem=16G -kernel /root/linux-next/$1/arch/x86/boot/bzImage \
-smp 4 \
-append "earlyprintk=ttyS0 root=/dev/sda1 console=ttyS0 debug psi=1 nokaslr ignore_loglevel" \
-hda /root/CentOS-7-x86_64-Azure-1703.qcow2 \
-net user,hostfwd=tcp::2222-:22 -net nic -s \
-object memory-backend-ram,id=mem0,size=3G \
-device virtio-mem-pci,id=vm0,memdev=mem0,node=0,requested-size=0M \
--nographic

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