Re: [Qemu-devel] [PATCH v2 1/8] kvm: Set cpu_single_env only once

[Jan Kiszka <jan.kiszka@web.de>]

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On 2012-02-11 14:59, Andreas Färber wrote:
> Am 11.02.2012 14:35, schrieb Jan Kiszka:
>> On 2012-02-11 14:21, Andreas Färber wrote:
>>> CPU base class v3: http://patchwork.ozlabs.org/patch/139284/ (v4
>>> coming up)
>>>
>>> That doesn't prevent target-specific devices. Although Paolo does
>>> want that to change wrt properties.
> 
>> This patch doesn't explain yet what shall happen to cpu_single_env
>> and CPUState accesses from target-specific devices.
> 
> True. We can't change them before all targets are converted. So far I
> have 3/14 and still some review comments to work in.
> 
> Another patch in that series uses a macro
> s/ENV_GET_OBJECT/ENV_GET_CPU/ to go from CPUState -> CPU while we
> convert targets.
> 
> Depending on our taste, cpu_single_env might become cpu_single_cpu,
> single_cpu or cpu_single.
> 
>> Do you plan accessors for registers?
> 
> No, registers are in target-specific ARMCPU, S390CPU, MIPSCPU, etc.
> and their CPU*State. It would be possible to have static inline
> accessors but so far I've seen no need.

Then the devices need to have access to a CPUState pointer, just as so far.

> 
>> And a service to return the CPU object associated with the
>> execution context?
> 
> What do you mean by execution context? TLS? The modelling of the state
> is pretty orthogonal to how/where we store it.

I mean "Where come this I/O access from?" and "am I running over some
VCPU thread?". This questions need to be answered in target-specific
device models and some parts of cpus.c (the latter is one motivation for
this patch).

Jan


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