Re: Exposing host debug capabilities to userspace

[Alexander Graf]

> Am 24.11.2014 um 13:32 schrieb Peter Maydell <peter.mayd...@linaro.org>:
> 
>> On 24 November 2014 at 12:26, Alexander Graf <ag...@suse.de> wrote:
>> On 24.11.14 12:35, Alex Bennée wrote:
>>>> * KVM ioctl GET_ONE_REG(ID_AA64DFR0_EL1)
>>> Nope, guest state API
>> 
>> What's the problem with using ONE_REG for this? After all, the total
>> number of available guest debug register is a guest vcpu property of
>> some sort.
> 
> Yes, but we don't want to know about properties of the guest
> vCPU. In an ideal world QEMU could reserve say half the debug
> registers for debugging the VM on startup and have KVM expose
> ID registers indicating to the guest that it only had the
> other half...

Yup, so create another (read-only) ONE_REG that exposes the number of actual 
guest debug registers.

Alex

> 
> -- PMM
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