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Re: [Qemu-devel] [PATCH] memory: simple memory tree printer

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH] memory: simple memory tree printer
Date: Wed, 14 Sep 2011 22:24:26 +0300
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2

On 09/14/2011 09:10 PM, Jan Kiszka wrote:
OK, let's try again: Do we have to model hierarchy in PIO address space
at all? I don't think so.

We do. A device listens to addresses 0x100-0x110. Another BAR (at 0x106) clips this to 0x100-0x106. The pci/pci bridge clips this to 0x105-0x106. The host pci bridge remaps this as 0x1000000105-0x1000000106 in the memory address space space. But someone configured a cpu-local region at this address, so the cpu can't reach it at all.

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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