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From: "Jan Beulich" <JBeulich@suse.com>
To: "Michael S. Tsirkin" <mst@redhat.com>, "Victor Miasnikov" <vvm@tut.by>
Cc: <olaf@aepfle.de>, <bp@alien8.de>, <apw@canonical.com>,
	<x86@kernel.org>, <tglx@linutronix.de>,
	<devel@linuxdriverproject.org>, <gregkh@linuxfoundation.org>,
	"K. Y. Srinivasan" <kys@microsoft.com>, <jasowang@redhat.com>,
	<linux-kernel@vger.kernel.org>, <hpa@zytor.com>
Subject: Re: KVM  "Hyper-V emulation"   -- this can be related "Linux on Hyper-V" ? Or  "KVM emulates Hyper-V" as  "Hyper-V emulates Hyper-V" ? Re: [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V
Date: Wed, 17 Apr 2013 13:12:37 +0100	[thread overview]
Message-ID: <516EADD502000078000CE112@nat28.tlf.novell.com> (raw)
In-Reply-To: <20130417101617.GF3881@redhat.com>

>>> On 17.04.13 at 12:16, "Michael S. Tsirkin" <mst@redhat.com> wrote:
> If the hypervisor says it's Hyper-V, that's because it wants
> guests to use Hyper-V. I don't see why is guest second-guessing
> this a good idea.

There are two reasons here: For one, when the hypervisor is not
Hyper-V, but is providing some Hyper-V emulation, that's intended
for Windows guests to use, not e.g. Linux ones, especially when
such guests could use the native hypervisor interface with much
greater benefit.

And second, there reportedly are features of (newer?) Hyper-V
that some emulation may not provide, but that are also not easily
detectable.

Jan


  reply	other threads:[~2013-04-17 12:11 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-04  1:21 [PATCH 0/3] X86: Deliver Hyper-V interrupts on a seperate IDT vector K. Y. Srinivasan
2013-02-04  1:22 ` [PATCH 1/3] x86: Hyper-V: register clocksource only if its advertised K. Y. Srinivasan
2013-02-04  1:22   ` [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V K. Y. Srinivasan
2013-02-13  0:57     ` [tip:x86/hyperv] " tip-bot for K. Y. Srinivasan
2013-04-17  7:06     ` [PATCH 2/3] " Michael S. Tsirkin
2013-04-17  9:10       ` KVM "Hyper-V emulation" -- this can be related "Linux on Hyper-V" ? Or "KVM emulates Hyper-V" as "Hyper-V emulates Hyper-V" ? " Victor Miasnikov
2013-04-17 10:16         ` Michael S. Tsirkin
2013-04-17 12:12           ` Jan Beulich [this message]
2013-04-17 12:15             ` Michael S. Tsirkin
     [not found]             ` <CAP2xkNqGgbYz1gdS85xjA8gwROGY89fAsiaRiGSE90xnzjJ4Xw@mail.gmail.com>
2013-04-17 12:43               ` Michael S. Tsirkin
2013-04-17 14:08                 ` Victor Miasnikov
2013-04-17 13:20       ` KY Srinivasan
2013-04-17 12:48         ` Michael S. Tsirkin
2013-04-17 14:12           ` KY Srinivasan
2013-04-17 13:25             ` Michael S. Tsirkin
2013-04-17 14:34               ` KY Srinivasan
2013-04-17 13:48                 ` Michael S. Tsirkin
2013-04-17 15:31                   ` KY Srinivasan
2013-04-17 15:50                     ` Jan Beulich
2013-04-17 16:28                       ` KY Srinivasan
2013-04-18  7:48                         ` Michael S. Tsirkin
2013-04-18 13:23                           ` KY Srinivasan
2013-04-18 13:30                             ` KY Srinivasan
2013-04-17 13:52         ` Jan Beulich
2013-04-17 13:01           ` Michael S. Tsirkin
2013-04-17 13:11             ` Michael S. Tsirkin
2013-04-17 14:09             ` Jan Beulich
2013-04-17 15:17               ` H. Peter Anvin
2013-02-04  1:22   ` [PATCH 3/3] X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts K. Y. Srinivasan
2013-02-13  0:58     ` [tip:x86/hyperv] " tip-bot for K. Y. Srinivasan
2013-02-13  1:58       ` [tip:x86/hyperv] x86, hyperv: HYPERV depends on X86_LOCAL_APIC tip-bot for H. Peter Anvin
2013-02-13  2:05         ` KY Srinivasan
2013-02-13  2:56       ` [tip:x86/hyperv] X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts Yinghai Lu
2013-02-13  3:32         ` KY Srinivasan
2013-02-13  3:46           ` H. Peter Anvin
2013-02-13  3:49             ` KY Srinivasan
2013-02-13  3:54               ` H. Peter Anvin
2013-02-13  3:58                 ` KY Srinivasan
2013-02-13  4:42                   ` Yinghai Lu
2013-02-13 12:47                     ` KY Srinivasan
2013-02-13  0:56   ` [tip:x86/hyperv] x86: Hyper-V: register clocksource only if its advertised tip-bot for Olaf Hering
2013-02-05 11:16 ` [PATCH 0/3] X86: Deliver Hyper-V interrupts on a seperate IDT vector KY Srinivasan
2013-04-17 13:49 KVM "Hyper-V emulation" -- this can be related "Linux on Hyper-V" ? Or "KVM emulates Hyper-V" as "Hyper-V emulates Hyper-V" ? Re: [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V Victor Miasnikov

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