[Xen-devel] Xen Interdomain Semaphore

[Timothy Hayes <hayesti@xxxxxx>]

Hi,

 

I'm working with some data that's been mapped into two virtual machine address spaces (this is kernel module code). Right now if I try to manipulate the data there are race conditions so naturally I need a constraint like a mutex or a semaphore. I'm not 100% certain, but I'm guessing the Linux kernel semaphore isn't going to work as expected since it puts a process to sleep for a wait() call and wakes a process up for the signal() call. The domain in question won't be the same domain that created the process.

 

I'm wondering if there is an interdomain semaphore for Xen; maybe someone has written one already? Maybe there are some "best practices" when it comes to something like this. Any tips would be really appreciated.

 

Kind regards

Tim Hayes

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