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From: | Avi Kivity |
Subject: | [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver |
Date: | Sun, 28 Mar 2010 12:45:02 +0300 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100301 Fedora/3.0.3-1.fc12 Thunderbird/3.0.3 |
On 03/28/2010 12:40 PM, Michael S. Tsirkin wrote:
uio accepts 32 bit writes to the char device file. We can encode the fd number there, and use the high bit to signal assign/deassign.Ugh. Very unexpandable.It currently fails on any non-4 byte write. So if we need more bits in the future we can always teach it about e.g. 8 byte writes. Do you think it's worth it doing it now already, and using 8 byte writes for msi mapping?
Aren't ioctls a lot simpler? Multiplexing multiple functions on write()s is just ioctls done uglier. -- error compiling committee.c: too many arguments to function
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