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Date: Mon, 24 Oct 2011 19:20:32 +0530
From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
        Greg Kroah-Hartman <gregkh@suse.de>, "H. Peter Anvin" <hpa@zytor.com>,
        Gleb Natapov <gleb@redhat.com>,
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        Sedat Dilek <sedat.dilek@gmail.com>, Yinghai Lu <yinghai@kernel.org>,
        Marcelo Tosatti <mtosatti@redhat.com>, Ingo Molnar <mingo@redhat.com>,
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        Suzuki Poulose <suzuki@linux.vnet.ibm.com>,
        Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH RFC V2 3/5] kvm hypervisor : Add two hypercalls to
 support pv-ticketlock
Message-ID: <20111024135032.GB10634@linux.vnet.ibm.com>
Reply-To: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
References: <20111023190307.16364.35381.sendpatchset@oc5400248562.ibm.com>
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 <4EA53A7D.300@redhat.com>
 <20111024122734.GA10634@linux.vnet.ibm.com>
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* Avi Kivity <avi@redhat.com> [2011-10-24 15:09:25]:

> > I guess with that change, we can also dropthe need for other hypercall
> > introduced in this patch (kvm_pv_kick_cpu_op()). Essentially a vcpu sleeping 
> > because of HLT instruction can be woken up by a IPI issued by vcpu releasing a
> > lock.
> 
> Not if interrupts are disabled.

Hmm yes ..so we need a kick hypercall then.

- vatsa