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xen-devel
[Xen-devel] Re: [PATCH RFC V2 3/5] kvm hypervisor : Add two hypercalls t
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To: |
Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH RFC V2 3/5] kvm hypervisor : Add two hypercalls to support pv-ticketlock |
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From: |
Raghavendra K T <raghukt@xxxxxxxxxxxxxxxxxx> |
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Date: |
Tue, 25 Oct 2011 23:54:02 +0530 |
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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> |
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Thu, 27 Oct 2011 04:42:59 -0700 |
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<20111023190307.16364.35381.sendpatchset@xxxxxxxxxxxxxxxxxxxx> <20111023190558.16364.2136.sendpatchset@xxxxxxxxxxxxxxxxxxxx> <4EA53A7D.300@xxxxxxxxxx> <20111024122734.GA10634@xxxxxxxxxxxxxxxxxx> <4EA56385.9040302@xxxxxxxxxx> <20111024135032.GB10634@xxxxxxxxxxxxxxxxxx> |
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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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