Re: [Qemu-devel] [PATCH 4/6] replace cpu_physical_memory_rw

[Glauber Costa <glommer@gmail.com>]

On Tue, Jan 20, 2009 at 6:24 PM, Avi Kivity <avi@redhat.com> wrote:
> Glauber Costa wrote:
>>
>> This patch introduces a kvm version of cpu_physical_memory_rw.
>> The main motivation is to bypass tcg version, which contains
>> tcg-specific code, as well as data structures not used by kvm,
>> such as l1_phys_map.
>>
>> In this patch, I'm using a runtime selection of which function
>> to call, but the mid-term goal is to use function pointers in
>> a way very close to which QEMUAccel used to be.
>>
>
> You will need to trivially adjust this for cpu_physical_memory_map().
Was it merged yet?

>
> You're still allocating the page descriptors, right?
By page descriptors you mean the l1_phys_map? If so, yes, because of
the way cpu_exec works. We can
live without them right now. With other patches I have queued up, we
get closer to this goal.

>
> My feeling is that qemu could long term drop phys_ram_base and move to a
> slot based structure; most lookups will hit on the first access (the largest
> slot).  The main motivation is to enable memory hotplug.  Of course this
> shouldn't interfere with this patchset going in.
>

-- 
Glauber  Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."