From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:54706)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1aLtNx-00070q-HW
	for qemu-devel@nongnu.org; Wed, 20 Jan 2016 09:05:25 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1aLtNr-0006AQ-UZ
	for qemu-devel@nongnu.org; Wed, 20 Jan 2016 09:05:21 -0500
Received: from mail-wm0-x243.google.com ([2a00:1450:400c:c09::243]:35543)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1aLtNr-0006A9-NN
	for qemu-devel@nongnu.org; Wed, 20 Jan 2016 09:05:15 -0500
Received: by mail-wm0-x243.google.com with SMTP id 123so4370575wmz.2
	for <qemu-devel@nongnu.org>; Wed, 20 Jan 2016 06:05:15 -0800 (PST)
Sender: Paolo Bonzini <paolo.bonzini@gmail.com>
References: <1450949580-25759-1-git-send-email-asmetanin@virtuozzo.com>
	<569DEA3B.2040107@openvz.org>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <569F9419.4000601@redhat.com>
Date: Wed, 20 Jan 2016 15:05:13 +0100
MIME-Version: 1.0
In-Reply-To: <569DEA3B.2040107@openvz.org>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH v1] kvm/x86: Hyper-V tsc page setup
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: "Denis V. Lunev" <den@openvz.org>, Andrey Smetanin <asmetanin@virtuozzo.com>, kvm@vger.kernel.org
Cc: Gleb Natapov <gleb@kernel.org>, Roman Kagan <rkagan@virtuozzo.com>, qemu-devel@nongnu.org



On 19/01/2016 08:48, Denis V. Lunev wrote:
>>
>> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
>> index 6877b4d7e..93c9e25 100644
>> --- a/include/linux/kvm_host.h
>> +++ b/include/linux/kvm_host.h
>> @@ -145,6 +145,7 @@ static inline bool is_error_page(struct page *page)
>>   #define KVM_REQ_HV_RESET          29
>>   #define KVM_REQ_HV_EXIT           30
>>   #define KVM_REQ_HV_STIMER         31
>> +#define KVM_REQ_HV_TSC_PAGE       32
>>     #define KVM_REQ_MAX               64
>>   
> ping

Applied with this change:

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index d7716c6e2752..047c275717d3 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -842,7 +842,7 @@ int kvm_hv_setup_tsc_page(struct kvm_vcpu *vcpu)
 		   tsc_khz, tsc, tsc_scale, tsc_offset);
 
 	tsc_ref.tsc_sequence++;
-	if (tsc_ref.tsc_sequence == 0)
+	if (tsc_ref.tsc_sequence == 0xFFFFFFFF tsc_ref.tsc_sequence == 0)
 		tsc_ref.tsc_sequence = 1;
 
 	tsc_ref.tsc_scale = tsc_scale;

and renumbering KVM_REQ_HV_TSC_PAGE from 32 to 31.

Paolo