linux-kernel - Re: [PATCH RFC V6 1/5] kvm hypervisor : Add a hypercall to KVM hypervisor to support pv-ticketlocks

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Message-ID: <4F9D417D.1050105@redhat.com>
Date:	Sun, 29 Apr 2012 16:26:21 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alexander Graf <agraf@...e.de>,
	Randy Dunlap <rdunlap@...otime.net>, linux-doc@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	KVM <kvm@...r.kernel.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Virtualization <virtualization@...ts.linux-foundation.org>,
	X86 <x86@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Xen <xen-devel@...ts.xensource.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [PATCH RFC V6 1/5] kvm hypervisor : Add a hypercall to KVM hypervisor
 to support pv-ticketlocks

On 04/29/2012 04:20 PM, Gleb Natapov wrote:
> > > This is too similar to kvm_irq_delivery_to_apic(). Why not reuse it. We
> > > can use one of reserved delivery modes as PV delivery mode. We will
> > > disallow guest to trigger it through apic interface, so this will not be
> > > part of ABI and can be changed at will.
> > >
> > 
> > I'm not thrilled about this.  Those delivery modes will eventually
> > become unreserved.  We can have a kvm_lookup_apic_id() that is shared
> > among implementations.
> > 
> This is only internal implementation. If they become unreserved we will
> use something else.
>

Yeah, I'm thinking of that time.  Why do something temporary and fragile?

-- 
error compiling committee.c: too many arguments to function

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