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Re: [Xen-devel] Timer going backwards and Unable to handle kernel NULLpo
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Timer going backwards and Unable to handle kernel NULLpointer |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Wed, 30 May 2007 18:31:04 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx, Robert Hulme <rob@xxxxxxxxxxxx> |
| Delivery-date: | Wed, 30 May 2007 10:29:32 -0700 |
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| In-reply-to: | <C28363F6.FB6C%keir@xxxxxxxxxxxxx> |
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| Thread-index: | Acei1xeKVjL7Yg7KEdyiOwAX8io7RQACTTEh |
| Thread-topic: | [Xen-devel] Timer going backwards and Unable to handle kernel NULLpointer |
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On 30/5/07 17:25, "Keir Fraser" <keir@xxxxxxxxxxxxx> wrote: > How about if we add support for ACPI PM timer as platform clock source? > Should be easy, any ACPI system will most likely provide it, and it should > be much better to use than the PIT (even a 24-bit PM timer should only wrap > every 5 seconds). We'll have to prevent dom0 monkeying with the timer: > either disallow accesses, or emulate the register. I've now done this in c/s 15189:2d7d33ac982. Works okay on my test box and is now available from the staging tree. I didn't implement anything to stop dom0 clobbering the timer register, as we don't currently do so for cyclone or hpet time sources either. We can add it if it turns out to be a problem. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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