Sukanto Ghosh wrote:
> Hi all,
>
> Why has the IO device emulation part been kept in
> userspace ?
> IO attempts cause VM-exits to the KVM (running in
> kernel-mode) it then forwards these requests to the
> userspace (mode-switch). After completion of IO in
> userspace, another mode switch is done to KVM before
> resuming the guests.
> What would be the problems had the device emulation parts
> been moved totally to kernelspace ?
>
The simple reason is that people don't want to pull a lot of code into
kernel whose failure may crash the whole system, of course there are
many other reasons such as maintaining synchronization with Qemu
upstream, coding style, maintanence effort etc.
Eddie
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