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[Xen-devel] Re: [PATCH RFC V2 3/5] kvm hypervisor : Add two hypercalls to support pv-ticketlock
- To: Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>
- From: Raghavendra K T <raghukt@xxxxxxxxxxxxxxxxxx>
- Date: Tue, 25 Oct 2011 23:54:02 +0530
- Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Suzuki Poulose <suzuki@xxxxxxxxxxxxxxxxxx>, Xen <xen-devel@xxxxxxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Sedat Dilek <sedat.dilek@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Yinghai Lu <yinghai@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
- Delivery-date: Thu, 27 Oct 2011 04:42:59 -0700
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
On 10/24/2011 07:20 PM, Srivatsa Vaddagiri wrote:
* Avi Kivity<avi@xxxxxxxxxx> [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.
So then do also you foresee the need for directed yield at some point,
to address LHP? provided we have good improvements to prove.
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