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[Xen-devel] Re: [PATCH RFC V2 3/5] kvm hypervisor : Add two hypercalls to support pv-ticketlock
- To: Sasha Levin <levinsasha928@xxxxxxxxx>
- From: Raghavendra K T <raghukt@xxxxxxxxxxxxxxxxxx>
- Date: Mon, 24 Oct 2011 16:30:46 +0530
- Cc: x86@xxxxxxxxxx, KVM <kvm@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Xen <xen-devel@xxxxxxxxxxxxxxxxxxx>, Sedat Dilek <sedat.dilek@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Yinghai Lu <yinghai@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Suzuki Poulose <suzuki@xxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 25 Oct 2011 09:55:53 -0700
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
On 10/24/2011 03:31 PM, Sasha Levin wrote:
On Mon, 2011-10-24 at 00:35 +0530, Raghavendra K T wrote:
Add two hypercalls to KVM hypervisor to support pv-ticketlocks.
+static void kvm_pv_kick_cpu_op(struct kvm *kvm, int cpu)
+{
+ struct kvm_vcpu *vcpu = kvm_get_vcpu(kvm, cpu);
+
+ if (vcpu) {
+ vcpu->kicked = 1;
I'm not sure about it, but maybe we want a memory barrier over here?
Yes, Thanks for pointing this. Avi Kivity also pointed same. 'll add
barrier() here.
+ wake_up_interruptible(&vcpu->wq);
+ }
+}
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