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| From: | Avi Kivity |
| Subject: | [Qemu-devel] Re: [PATCH 4/7] ide: use the PCI memory access interface |
| Date: | Thu, 02 Sep 2010 19:07:31 +0300 |
| User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8) Gecko/20100806 Fedora/3.1.2-1.fc13 Lightning/1.0b2pre Thunderbird/3.1.2 |
On 09/02/2010 06:39 PM, Michael S. Tsirkin wrote:
On Thu, Sep 02, 2010 at 06:24:25PM +0300, Avi Kivity wrote:That's not a practical long term solution. Eventually everything gets turned on.That's why I wanted a simple !iommu check and fallback. This way unless it's really used there's no overhead.
It's not very different from an indirect function call. Modern branch predictors store the target function address and supply it ahead of time.
I've never seen a function call instruction in a profile. -- error compiling committee.c: too many arguments to function
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