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Re: [Xen-devel] Re: how to handle paged hypercall args?
| To: | Olaf Hering <olaf@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Re: how to handle paged hypercall args? |
| From: | Keir Fraser <keir@xxxxxxx> |
| Date: | Thu, 11 Nov 2010 20:08:59 +0000 |
| Cc: | |
| Delivery-date: | Thu, 11 Nov 2010 12:09:54 -0800 |
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| Thread-topic: | [Xen-devel] Re: how to handle paged hypercall args? |
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On 11/11/2010 14:33, "Olaf Hering" <olaf@xxxxxxxxx> wrote: > So is that an acceptable way to deal with the HVMCOPY_gfn_paged_out > return codes from __hvm_copy? > Or should I explore some different way, like spinning there and possible > let other threads-of-execution make progress while waiting for the gfns > to come back? You can't just spin because Xen is not preemptible. If it were a single CPU system for example, no other thread would ever run again. You have to 'spin' via a preemptible loop that returns to guest context and then back into the hypercall. Which appears to be what you're doing. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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