From: Paolo Bonzini <pbonzini@redhat.com>
To: Roman Kagan <rkagan@virtuozzo.com>,
"Denis V. Lunev" <den@openvz.org>,
Andrey Smetanin <asmetanin@virtuozzo.com>,
kvm@vger.kernel.org, Gleb Natapov <gleb@kernel.org>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v1] kvm/x86: Hyper-V tsc page setup
Date: Wed, 20 Jan 2016 22:10:06 +0100 [thread overview]
Message-ID: <569FF7AE.7060207@redhat.com> (raw)
In-Reply-To: <20160120145218.GH26969@rkaganb.sw.ru>
On 20/01/2016 15:52, Roman Kagan wrote:
> I think Paolo wanted to be compatible not only with the de facto
> implementation in Windows Hyper-V guests, but also with the Linux driver
> which followed the buggy spec and thought 0xFFFFFFFF to be invalid.
0xFFFFFFFF is not invalid; it means it is valid but you have to use the
MSR. With 0, you cannot use the MSR either and Windows will use the
ACPI PM timer or similar. You can see the difference from the result of
QueryPerformanceFrequency, IIRC.
Paolo
next prev parent reply other threads:[~2016-01-20 21:10 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-24 9:33 [Qemu-devel] [PATCH v1] kvm/x86: Hyper-V tsc page setup Andrey Smetanin
2016-01-05 21:48 ` Peter Hornyack
2016-01-06 9:22 ` Andrey Smetanin
2016-01-12 7:43 ` Andrey Smetanin
2016-01-19 7:48 ` Denis V. Lunev
2016-01-20 14:05 ` Paolo Bonzini
2016-01-20 14:41 ` Andrey Smetanin
2016-01-20 14:44 ` Denis V. Lunev
2016-01-20 14:52 ` Roman Kagan
2016-01-20 14:54 ` Denis V. Lunev
2016-01-20 21:10 ` Paolo Bonzini [this message]
2016-01-22 10:08 ` Paolo Bonzini
2016-01-22 10:15 ` Andrey Smetanin
2016-01-22 11:02 ` Paolo Bonzini
2016-01-22 11:11 ` Andrey Smetanin
2016-01-22 11:31 ` Andrey Smetanin
2016-01-22 11:53 ` Paolo Bonzini
2016-01-22 11:59 ` Andrey Smetanin
2016-01-22 13:13 ` Andrey Smetanin
2016-01-22 13:21 ` Paolo Bonzini
2016-01-22 13:34 ` Andrey Smetanin
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