Amit Shah wrote:
On (Tue) Aug 25 2009 [11:47:20], Amit Shah wrote:
Hello all,
Here is a new iteration of the patch series that implements a
transport for guest and host communications.
The code has been updated to reuse the virtio-console device instead
of creating a new virtio-serial device.
And the problem now is that hvc calls the put_chars function with
spinlocks held and we now allocate pages in send_buf(), called from
put_chars.
Don't allocate pages in send_buf. There's a fixed number of possible
entries on the ring. Preallocate them up front and then you don't need
to sleep.
A few solutions:
- Keep things as they are, virtio_console.c remains as it is and
virtio_serial.c gets added
Not an option from a QEMU perspective.
Regards,
Anthony Liguori
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