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Re: [Xen-devel] Re: [Qemu-devel] Recursion in cpu_physical_memory_rw
From: |
Keir Fraser |
Subject: |
Re: [Xen-devel] Re: [Qemu-devel] Recursion in cpu_physical_memory_rw |
Date: |
Wed, 15 Nov 2006 07:57:27 -0000 |
User-agent: |
Microsoft-Entourage/11.2.5.060620 |
On 15/11/06 2:58 am, "Herbert Xu" <address@hidden> 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