From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
To: "Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>
Cc: peterz@infradead.org, mingo@elte.hu, jeremy@goop.org,
mtosatti@redhat.com, kvm@vger.kernel.org, x86@kernel.org,
vatsa@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
avi@redhat.com, hpa@zytor.com
Subject: Re: [RFC PATCH v1 1/5] KVM Guest: Add VCPU running/pre-empted state for guest
Date: Tue, 01 May 2012 06:33:59 +0530 [thread overview]
Message-ID: <4F9F367F.8090603@linux.vnet.ibm.com> (raw)
In-Reply-To: <20120427162314.27082.13703.stgit@abhimanyu>
On 04/27/2012 09:53 PM, Nikunj A. Dadhania wrote:
> The patch adds guest code for msr between guest and hypervisor. The
> msr will export the vcpu running/pre-empted information to the guest
> from host. This will enable guest to intelligently send ipi to running
> vcpus and set flag for pre-empted vcpus. This will prevent waiting for
> vcpus that are not running.
>
> Suggested-by: Peter Zijlstra<a.p.zijlstra@chello.nl>
> Signed-off-by: Nikunj A. Dadhania<nikunj@linux.vnet.ibm.com>
> ---
> arch/x86/include/asm/kvm_para.h | 10 ++++++++++
> arch/x86/kernel/kvm.c | 33 +++++++++++++++++++++++++++++++++
> 2 files changed, 43 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
> index 77266d3..f57b5cc 100644
> --- a/arch/x86/include/asm/kvm_para.h
> +++ b/arch/x86/include/asm/kvm_para.h
> @@ -24,6 +24,7 @@
> #define KVM_FEATURE_ASYNC_PF 4
> #define KVM_FEATURE_STEAL_TIME 5
> #define KVM_FEATURE_PV_UNHALT 6
> +#define KVM_FEATURE_VCPU_STATE 7
I think you intended to use KVM_FEATURE_VCPU_STATE to address
guest/host compatibility issue so that host/guest does not break
when one of them run older kernel?
next prev parent reply other threads:[~2012-05-01 1:04 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-27 16:23 [RFC PATCH v1 0/5] KVM paravirt remote flush tlb Nikunj A. Dadhania
2012-04-27 16:23 ` [RFC PATCH v1 1/5] KVM Guest: Add VCPU running/pre-empted state for guest Nikunj A. Dadhania
2012-05-01 1:03 ` Raghavendra K T [this message]
2012-05-01 3:25 ` Nikunj A Dadhania
2012-04-27 16:23 ` [RFC PATCH v1 2/5] KVM-HV: " Nikunj A. Dadhania
2012-04-27 16:24 ` [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb_others Nikunj A. Dadhania
2012-04-29 12:23 ` Avi Kivity
2012-05-01 3:34 ` Nikunj A Dadhania
2012-05-01 9:39 ` Peter Zijlstra
2012-05-01 10:47 ` Avi Kivity
2012-05-01 10:57 ` Peter Zijlstra
2012-05-01 10:59 ` Peter Zijlstra
2012-05-01 22:49 ` Jeremy Fitzhardinge
2012-05-03 14:09 ` Stefano Stabellini
2012-05-01 12:12 ` Avi Kivity
2012-05-01 14:59 ` Peter Zijlstra
2012-05-01 15:31 ` Avi Kivity
2012-05-01 15:36 ` Peter Zijlstra
2012-05-01 15:39 ` Avi Kivity
2012-05-01 15:42 ` Peter Zijlstra
2012-05-01 15:11 ` Peter Zijlstra
2012-05-01 15:33 ` Avi Kivity
2012-05-01 15:14 ` Peter Zijlstra
2012-05-01 15:36 ` Avi Kivity
2012-05-01 16:16 ` Peter Zijlstra
2012-05-01 16:43 ` Paul E. McKenney
2012-05-01 16:18 ` Peter Zijlstra
2012-05-01 16:20 ` Peter Zijlstra
2012-05-02 8:51 ` Nikunj A Dadhania
2012-05-02 10:20 ` Peter Zijlstra
2012-05-02 13:53 ` Nikunj A Dadhania
2012-05-04 4:32 ` Nikunj A Dadhania
2012-05-04 11:44 ` Srivatsa Vaddagiri
2012-05-07 3:10 ` Nikunj A Dadhania
2012-04-27 16:26 ` [RFC PATCH v1 4/5] KVM: get kvm_kick_vcpu out for pv_flush Nikunj A. Dadhania
2012-04-27 16:27 ` [RFC PATCH v1 5/5] KVM: Introduce PV kick in flush tlb Nikunj A. Dadhania
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