linux-kernel - Re: [PATCH RFC 04/15] KVM: Implement ring-based dirty memory tracking

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Date:   Wed, 18 Dec 2019 17:49:07 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>
Subject: Re: [PATCH RFC 04/15] KVM: Implement ring-based dirty memory tracking

On Wed, Dec 18, 2019 at 11:37:31PM +0100, Paolo Bonzini wrote:
> On 18/12/19 23:24, Sean Christopherson wrote:
> > I've lost track of the problem you're trying to solve, but if you do
> > something like "vcpu_smm=false", explicitly pass an address space ID
> > instead of hardcoding x86 specific SMM crud, e.g.
> > 
> > 	kvm_vcpu_write*(..., as_id=0);
> 
> And the point of having kvm_vcpu_* vs. kvm_write_* was exactly to not
> having to hardcode the address space ID.  If anything you could add a
> __kvm_vcpu_write_* API that takes vcpu+as_id, but really I'd prefer to
> keep kvm_get_running_vcpu() for now and then it can be refactored later.
>  There are already way too many memory r/w APIs...

Yeah actuall that's why I wanted to start working on that just in case
it could help to unify all of them some day (and since we did go a few
steps forward on that when discussing the dirty ring).  But yeah
kvm_get_running_vcpu() for sure works for us already; let's go the
easy way this time.  Thanks,

-- 
Peter Xu