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RE: [Xen-devel] Recursion in cpu_physical_memory_rw
| To: | "Herbert Xu" <herbert@xxxxxxxxxxxxxxxxxxx>, <qemu-devel@xxxxxxxxxx>, "Xen Development Mailing List" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] Recursion in cpu_physical_memory_rw |
| From: | "Li, Xin B" <xin.b.li@xxxxxxxxx> |
| Date: | Wed, 15 Nov 2006 08:50:42 +0800 |
| Delivery-date: | Tue, 14 Nov 2006 16:51:16 -0800 |
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| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
| Thread-index: | AccIT10PKs3oZEsZRR+qQklQPNQzkAAAHoGQ |
| Thread-topic: | [Xen-devel] Recursion in cpu_physical_memory_rw |
> >A number of qemu driver backends (such as rtl8139) call the function >cpu_physical_memory_rw to read/write guest memory. The target guest >memory address is often supplied by the guest. This opens up the >possibility of a guest giving an address which happens to be an MMIO >address which can potentially lead to infinite recursion involving >cpu_physical_memory_rw. > >Since these driver backends really only need to access system memory, >we could simply provide a new access interface that does not allow >MMIO addresses. > >Any comments on this problem? > The interface called paddr_is_ram should help. -Xin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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