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Re: [Qemu-devel] [RFC] Memory API
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [RFC] Memory API |
Date: |
Thu, 19 May 2011 14:20:39 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2011-05-19 13:57, Avi Kivity wrote:
> On 05/19/2011 02:54 PM, Gleb Natapov wrote:
>>>
>>> In this case the device would call a chipset function, passing the
>>> memory region as a parameter, and the chipset would call
>>> m_r_add_subregion().
>> But then chipset can resolve all overlapping by itself and register only
>> regions that are actually accessible by a guest software.
>
> Sure it can (and it does now), but it's hard. This API centralizes the
> logic, leaving the devices/chipsets to specify what they want.
>
> For a PC, we have at least two such cases, the ISA bus and the PCI bus.
>
>> Also there are
>> devices that on some architectures are accessed through a chipset and on
>> other they resides directly on a system bus. If they will need to call
>> different memory registration api depending on how they are instantiated
>> the code can become messy.
>
> An example is ne2000-isa and ne2000-pci. There's no getting around some
> glue logic, but I think this API minimizes it (you can declare
> everything about your memory region in common code, the only thing that
> is different is registration).
If devices register against the corresponding qbus (I expect we'll have
multiple ones in the future), not even that need to be different.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
- Re: [Qemu-devel] [RFC] Memory API, (continued)
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Gleb Natapov, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Gleb Natapov, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Gleb Natapov, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Gleb Natapov, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API,
Jan Kiszka <=
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Anthony Liguori, 2011/05/19