Re: [Qemu-devel] [patch] non-blocking disk IO

[John Coiner]

Magnus,

I don't think the Windows 2000 install hack will ever be obsolete.

The installer assumes that a hard disk will take nonzero time to read 
some data. QEMU always services a read in zero-guest-time. (With the 
nonblocking IO patch, zero-guest-time reads still occur, when the 
requested data is in the host's file cache.)

I doubt the IDE spec allows Windows to make this assumption... but the 
assumption is there, and we work around it by adding a delay that's 
visible to the guest.

-- John