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[Xen-devel] BSS region in xen_in_range is incorrect
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] BSS region in xen_in_range is incorrect |
| From: | "Han, Weidong" <weidong.han@xxxxxxxxx> |
| Date: | Thu, 22 Apr 2010 17:35:51 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 22 Apr 2010 02:37:29 -0700 |
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| Thread-index: | Acrh/zKm6Wy3InEBQhuIQSO4VmUQ+A== |
| Thread-topic: | BSS region in xen_in_range is incorrect |
In c/s 21038, console_init_postirq frees default static ring buffer if a dynamic one was obtained. This makes dom0 can use the default static ring buffer which is in BSS region, but xen_in_range didn't remove the region from BSS region which won't be mapped in VT-d page table, so it causes problems when a device DMAs to that region. To fix this issue, 1) remove the freed region from BSS region in xen_in_range; 2) don't free default static ring buffer. Method 1) can fix it cleanly, but maybe need many changes. Method 2) is simple, but it wastes some resources. Keir / Jan, what's your opinion? Regards, Weidong _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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