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[Qemu-devel] when the device property is called?


From: Wang Dong
Subject: [Qemu-devel] when the device property is called?
Date: Mon, 12 Jun 2017 18:23:54 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

Hi,

I am newbie to qemu. Recently, I am reading the code and found one question.

I can see some property function is added to the object. But I wonder when these

property functions are called or triggered. When I try to trace them, only the initialization

is found. I found some unclear lines in the doc, I can not figure out the details.

*"Device properties in QOM are bound to devices and are implemented by closures provided by the device.
***

*A Visitor is passed to the closure which effectively allows properties to be set/get through native C types.***

*Mapping to any other type of representation (string or otherwise) is done by a Visitor with no knowledge of the device or property.***

 "

I also found this property function has something to do with the *Visitor*, and I trace the function *x86_cpu_get_crash_info_qom* along with

Visitor. And I found that these crash information is finally read out to log file along with this visitor. *But **still I have no idea when this **
**x86_cpu_get_crash_info_qom is triggered.
*

But as I found that the cpu class is initialized with an another function *cc->get_crash_info = x86_cpu_get_crash_info*

And with this function, the crash information will also be put out to log file. And this function will return a crash information struct to *qemu_system_**guest**_panicked*, which will then print the crash info to log file too.

*I wonder what is the difference between them? And when the property function is called?
*

*
*

*Any clue will be very appreciated. Thanks in advance.
*

Thanks in advance.



--
Best regards.

Wang Dong



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