[Qemu-devel] vexpress: Horribly slow MMC emulation on ARM host

[Jan Kiszka]

Hi,

this basically concludes my problems of getting KVM running on the
Jetson TK1 board with QEMU: all fine now, provided I switch from

  qemu-system-arm -machine vexpress-a15 -sd disk.img ...

to

  qemu-system-arm -machine vexpress-a15 \
    -drive file=disk.img,if=none,id=disk \
    -device virtio-blk-device,drive=disk ...

This applies to both emulated and KVM accelerated mode. If I run the
same image (and guest kernel) emulated on my x86 box, there is still a
difference between both disk modes, but it's not that excessive. On ARM
the system requires minutes to boot from MMC - if it doesn't run into
timeouts earlier. It's seconds with virtio.

Known problem?

Jan

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