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Re: [Qemu-devel] [PATCH 09/26] ehci: Use uframe precision for interrupt

From: Hans de Goede
Subject: Re: [Qemu-devel] [PATCH 09/26] ehci: Use uframe precision for interrupt threshold checking
Date: Tue, 18 Dec 2012 12:30:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 
Hi,

On 12/18/2012 12:03 PM, Gerd Hoffmann wrote:

   Hi,


Can qemu not handle an mmio range where writes are trapped, but reads are
not? That would force the use of the shadow variable, but should otherwise
provide a nice speedup.


No.  vmexit is needed anyway btw, but the round-trip to qemu userspace
could be short-cutted in theory.  It's non-trivial though.  Alex had a
talk about it at kvm forum (covering ide).


Ok, then I'll respin the patch getting rid of the shadow variable.

Regards,

Hans
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