linux-kernel - Re: [PATCH] arm64: KVM: export current vcpu->pause state via pseudo regs

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Message-ID: <877g2ol9dh.fsf@linaro.org>
Date:	Mon, 04 Aug 2014 13:35:15 +0100
From:	Alex Bennée <alex.bennee@...aro.org>
To:	Christoffer Dall <christoffer.dall@...aro.org>
Cc:	Alex Bennee <alex@...nee.com>,
	Peter Maydell <peter.maydell@...aro.org>,
	kvm-devel <kvm@...r.kernel.org>, Gleb Natapov <gleb@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	open list <linux-kernel@...r.kernel.org>,
	"kvmarm\@lists.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	arm-mail-list <linux-arm-kernel@...ts.infradead.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH] arm64: KVM: export current vcpu->pause state via pseudo regs


Christoffer Dall writes:

> On Thu, Jul 31, 2014 at 07:21:44PM +0200, Paolo Bonzini wrote:
>> Il 31/07/2014 19:04, Peter Maydell ha scritto:
>> > On 31 July 2014 17:57, Paolo Bonzini <pbonzini@...hat.com> wrote:
>> >> Il 09/07/2014 15:55, Alex Bennée ha scritto:
<snip>
>> 
>> No, it's not.  It's just the state of the CPU, s390 will be using it too.
>> 
>> On x86 the states are uninitialized (UNINITIALIZED), stopped
>> (INIT_RECEIVED), running (RUNNABLE), halted (HALTED).  CPU 0 starts in
>> RUNNABLE state, other CPUs start in UNINITIALIZED state.  There are
>> x86-specific cases (uninitialized) and x86-isms (the INIT_RECEIVED
>> name), but the idea is widely applicable.
>> 
> Alex, I think it makes perfect sense to use GET/SET_MP_STATE, will you
> revise the patch?

I agree we should use the API that is explicitly for this so I'm looking
at re-doing the patch now.

>
> (Don't forget to update the documentation to reflect it is now supported
> on ARM, and which states are used to represent what there.)
>
> Thanks,
> -Christoffer

-- 
Alex Bennée
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