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Re: [Xen-devel] Blocking upcall to dom0

On 28 Feb 2005, at 23:04, Andrew Biggadike wrote:

I'm working on a project in which I'd like to implement an upcall into
dom0 from certain points within Xen, where Xen is running in the context
of one of the unprivileged domains.  The upcall will pass a
variable-sized data structure (up to a few hundred bytes) to dom0, and
I need Xen to block on the completion of this upcall.  Also, it's
important that the source of the upcall start from within Xen itself,
rather than the domU guest.

In what context do you want to block? That of some other domain, or block all domains while dom0 executes, or something else?

Xen doesn't support arbitrary blocking within itself since it only maintains per-CPU stacks, not per-domain stacks. So you have to create a closure manually.

 -- Keir

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