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Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode
Date: Tue, 13 Sep 2011 11:10:05 +0300
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2

On 09/13/2011 10:54 AM, Alexander Graf wrote:
>>  Yeah, usually the ISA bus is behind an ISA-PCI bridge, so it should inherit 
the offset from its parent. Or do you mean something different?
>  He means that isa_mem_base should go away; instead isa_address_space() 
should be a subregion at offset 0x80000000.

So we are talking about the same thing. Logically speaking, ISA devices are 
behind the ISA-PCI bridge, so the parent would be the bridge, right?

Right. system_memory -> pci_address_space() -> isa_address_space() -> various vga areas.

>  Which vga variant are you using?

This is stdvga.

Don't see the call to vga_init() in that path (this is what passes isa_address_space() to the vga core).

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

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