From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Fedin Subject: RE: [PATCH v1 4/5] kvm/x86: Hyper-V VMBus hypercall userspace exit Date: Thu, 14 Jan 2016 11:30:43 +0300 Message-ID: <009401d14ea5$dc8cf250$95a6d6f0$@samsung.com> References: <1452595842-20880-1-git-send-email-asmetanin@virtuozzo.com> <1452595842-20880-5-git-send-email-asmetanin@virtuozzo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: 'Gleb Natapov' , 'Paolo Bonzini' , 'Joerg Roedel' , "'K. Y. Srinivasan'" , 'Haiyang Zhang' , 'Roman Kagan' , "'Denis V. Lunev'" , qemu-devel@nongnu.org To: 'Andrey Smetanin' , kvm@vger.kernel.org Return-path: Received: from mailout3.w1.samsung.com ([210.118.77.13]:12008 "EHLO mailout3.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750768AbcANIar (ORCPT ); Thu, 14 Jan 2016 03:30:47 -0500 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout3.w1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0O0X00FO8OZ88R00@mailout3.w1.samsung.com> for kvm@vger.kernel.org; Thu, 14 Jan 2016 08:30:45 +0000 (GMT) In-reply-to: <1452595842-20880-5-git-send-email-asmetanin@virtuozzo.com> Content-language: ru Sender: kvm-owner@vger.kernel.org List-ID: Hello! > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -3359,6 +3359,14 @@ Hyper-V SynIC state change. Notification is used to remap SynIC > event/message pages and to enable/disable SynIC messages/events processing > in userspace. > > + /* KVM_EXIT_HYPERV_HCALL */ > + struct { > + __u64 input; > + __u64 params[2]; > + __u64 result; > + } hv_hcall; > +Indicates that the VCPU exits into userspace to process some guest > +Hyper-V hypercalls. Why introducing this? We already have KVM_EXIT_HYPERCALL, which is exactly the same. AFAIK it's not used at the moment. Additionally, in theory we could have hypercalls handled in userspace for something else except HyperV. And not only for x86. Kind regards, Pavel Fedin Senior Engineer Samsung Electronics Research center Russia From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39379) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aJdIz-0007vu-OK for qemu-devel@nongnu.org; Thu, 14 Jan 2016 03:30:54 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aJdIw-0003jD-Gh for qemu-devel@nongnu.org; Thu, 14 Jan 2016 03:30:53 -0500 Received: from mailout3.w1.samsung.com ([210.118.77.13]:12012) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aJdIw-0003iz-AJ for qemu-devel@nongnu.org; Thu, 14 Jan 2016 03:30:50 -0500 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout3.w1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0O0X00FO8OZ88R00@mailout3.w1.samsung.com> for qemu-devel@nongnu.org; Thu, 14 Jan 2016 08:30:44 +0000 (GMT) From: Pavel Fedin References: <1452595842-20880-1-git-send-email-asmetanin@virtuozzo.com> <1452595842-20880-5-git-send-email-asmetanin@virtuozzo.com> In-reply-to: <1452595842-20880-5-git-send-email-asmetanin@virtuozzo.com> Date: Thu, 14 Jan 2016 11:30:43 +0300 Message-id: <009401d14ea5$dc8cf250$95a6d6f0$@samsung.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit Content-language: ru Subject: Re: [Qemu-devel] [PATCH v1 4/5] kvm/x86: Hyper-V VMBus hypercall userspace exit List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: 'Andrey Smetanin' , kvm@vger.kernel.org Cc: 'Gleb Natapov' , 'Joerg Roedel' , qemu-devel@nongnu.org, 'Roman Kagan' , "'Denis V. Lunev'" , 'Paolo Bonzini' , "'K. Y. Srinivasan'" , 'Haiyang Zhang' Hello! > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -3359,6 +3359,14 @@ Hyper-V SynIC state change. Notification is used to remap SynIC > event/message pages and to enable/disable SynIC messages/events processing > in userspace. > > + /* KVM_EXIT_HYPERV_HCALL */ > + struct { > + __u64 input; > + __u64 params[2]; > + __u64 result; > + } hv_hcall; > +Indicates that the VCPU exits into userspace to process some guest > +Hyper-V hypercalls. Why introducing this? We already have KVM_EXIT_HYPERCALL, which is exactly the same. AFAIK it's not used at the moment. Additionally, in theory we could have hypercalls handled in userspace for something else except HyperV. And not only for x86. Kind regards, Pavel Fedin Senior Engineer Samsung Electronics Research center Russia