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Re: [Xen-devel] Re: [Qemu-devel] Recursion in cpu_physical_memory_rw
| To: | Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, Paul Brook <paul@xxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Re: [Qemu-devel] Recursion in cpu_physical_memory_rw |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Wed, 15 Nov 2006 07:55:48 +0000 |
| Cc: | Xen Development Mailing List <xen-devel@xxxxxxxxxxxxxxxxxxx>, qemu-devel@xxxxxxxxxx |
| Delivery-date: | Tue, 14 Nov 2006 23:56:23 -0800 |
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| Thread-topic: | [Xen-devel] Re: [Qemu-devel] Recursion in cpu_physical_memory_rw |
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On 15/11/06 2:58 am, "Herbert Xu" <herbert@xxxxxxxxxxxxxxxxxxx> wrote: >> It isn't always system memory. Some DMA controllers deliberately write to >> device FIFOs. There are also several devices which map areas of onboard RAM. >> At minimum you need to make those to use RAM mappings rather than MMIO. > > I'm not suggesting that we change all existing users of cpu_physical_* > to a new interface that only accessed RAM. However, for cases where it > is obvious that only system RAM is intended (e.g., rtl8139), it makes > sense to bypass MMIO handlers. Could we add a recursion counter to the memory-access functions, and bail if it reaches some limit? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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