linux-kernel - Re: [PATCH RFC V6 1/5] kvm hypervisor : Add a hypercall to KVM hypervisor to support pv-ticketlocks

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Date:	Wed, 02 May 2012 01:50:06 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alexander Graf <agraf@...e.de>,
	Randy Dunlap <rdunlap@...otime.net>, linux-doc@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	KVM <kvm@...r.kernel.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Virtualization <virtualization@...ts.linux-foundation.org>,
	X86 <x86@...nel.org>, Gleb Natapov <gleb@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Xen <xen-devel@...ts.xensource.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [PATCH RFC V6 1/5] kvm hypervisor : Add a hypercall to KVM hypervisor
 to support pv-ticketlocks

On 04/30/2012 01:14 PM, Raghavendra K T wrote:

>>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>>> index 4044ce0..7fc9be6 100644
>>> --- a/arch/x86/kvm/x86.c
>>> +++ b/arch/x86/kvm/x86.c
>>> @@ -2147,6 +2147,7 @@ int kvm_dev_ioctl_check_extension(long ext)
>>> case KVM_CAP_ASYNC_PF:
>>> case KVM_CAP_GET_TSC_KHZ:
>>> case KVM_CAP_PCI_2_3:
>>> + case KVM_CAP_PV_UNHALT:
>>> r = 1;
>>> break;
>>> case KVM_CAP_COALESCED_MMIO:
>>
>> Redundant, since we can infer this from KVM_GET_SUPPORTED_CPUID. But
>> please indicate this in the documentation.
>>
>
> Ok. will mention that in documentation added for KVM_CAP_PV_UNHALT.
>

I think it is better to remove  KVM_CAP_PV_UNHALT itself and avoid
spamming CAP.. will do that in coming version.

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