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[Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and d
| To: | Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Fri, 16 Feb 2007 10:47:11 +0000 |
| Cc: | Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, Steven Hand <steven.hand@xxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx> |
| Delivery-date: | Fri, 16 Feb 2007 02:46:32 -0800 |
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| In-reply-to: | <20070216020947.03e1726e.akpm@xxxxxxxxxxxxxxxxxxxx> |
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| Thread-index: | AcdRt8/EDlrZar2rEduvqQAX8io7RQ== |
| Thread-topic: | [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. |
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On 16/2/07 10:09, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> Are the places where the domU code references machine addresses splattered
> all over the code? If not, they can just be wrapped with
> preempt_disable/preempt_enable?
The main places where machine addresses are 'visible' are any code that
holds a pte_t,pmd_t,pud_t,pgd_t. We hide the machine-to-pseudophysical and
pseudophysical-to-machine translations inside e.g., pte_val() and __pte()
(i.e., constructors and extractors for page table entries). Obviously the
users of these macros are open coded all over the place, quite apart from
the performance cost of sprinkling preempt_{enable,disable} so liberally.
-- Keir
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