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From: | Anthony Liguori |
Subject: | [Qemu-devel] Re: Extending virtio_console to support multiple ports |
Date: | Fri, 28 Aug 2009 12:00:08 -0500 |
User-agent: | Thunderbird 2.0.0.23 (X11/20090825) |
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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