linux-kernel - Re: [PATCH RFC V5 0/6] kvm : Paravirt-spinlock support for KVM guests

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Message-ID: <20120412002646.GC32051@amt.cnet>
Date:	Wed, 11 Apr 2012 21:26:46 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Alexander Graf <agraf@...e.de>, Gleb Natapov <gleb@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, X86 <x86@...nel.org>,
	Avi Kivity <avi@...hat.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Randy Dunlap <rdunlap@...otime.net>, linux-doc@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>,
	Virtualization <virtualization@...ts.linux-foundation.org>,
	Xen <xen-devel@...ts.xensource.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [PATCH RFC V5 0/6] kvm : Paravirt-spinlock support for KVM guests

On Thu, Mar 29, 2012 at 12:02:29AM +0530, Raghavendra K T wrote:
> On 03/23/2012 01:35 PM, Raghavendra K T wrote:
> >The 6-patch series to follow this email extends KVM-hypervisor and Linux guest
> >running on KVM-hypervisor to support pv-ticket spinlocks, based on Xen's
> >implementation.
> >
> >One hypercall is introduced in KVM hypervisor,that allows a vcpu to kick
> >another vcpu out of halt state.
> >The blocking of vcpu is done using halt() in (lock_spinning) slowpath.
> >one MSR is added to aid live migration.
> >
> >Changes in V5:
> >- rebased to 3.3-rc6
> >- added PV_UNHALT_MSR that would help in live migration (Avi)
> >- removed PV_LOCK_KICK vcpu request and pv_unhalt flag (re)added.
> 
> Sorry for pinging
> I know it is busy time. But I hope to get response on these patches
> in your free time, so that I can target next merge window for this.
> (whether it has reached some good state or it is heading in reverse
> direction!). it would really boost my morale.
> especially MSR stuff and dropping vcpu request bit for PV unhalt.
> 
> - Raghu

Looks good. Only the MSR appears an abuse, since there is no need
to expose the info to the guest.

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