From: "H. Peter Anvin" <hpa@zytor.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>,
olaf@aepfle.de, bp@alien8.de, apw@canonical.com, x86@kernel.org,
tglx@linutronix.de, devel@linuxdriverproject.org,
gregkh@linuxfoundation.org, jasowang@redhat.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V
Date: Thu, 31 Jan 2013 13:41:10 -0800 [thread overview]
Message-ID: <510AE4F6.1050407@zytor.com> (raw)
In-Reply-To: <5108ED9702000078000BAA08@nat28.tlf.novell.com>
On 01/30/2013 12:53 AM, Jan Beulich wrote:
>
> I'm not convinced that's the right approach - any hypervisor
> could do similar emulation, and hence you either want to make
> sure you run on Hyper-V (by excluding all others), or you
> tolerate using the emulation (which may require syncing up with
> the other guest implementations so that shared resources don't
> get used by two parties).
>
> I also wonder whether using the Hyper-V emulation (where
> useful, there might not be anything right now, but this may
> change going forward) when no Xen support is configured
> wouldn't be better than not using anything...
>
I'm confused about "the right approach" here is. As far as I
understand, this only can affect a Xen guest where HyperV guest support
is enabled but not Xen support, and only because Xen emulates HyperV but
does so incorrectly.
This is a Xen bug, and as such it makes sense to reject Xen
specifically. If another hypervisor emulates HyperV and does so
correctly there seems to be no reason to reject it.
-hpa
next prev parent reply other threads:[~2013-01-31 21:42 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-30 0:51 [PATCH 0/3] X86: Deliver Hyper-V interrupts on a seperate IDT vector K. Y. Srinivasan
2013-01-30 0:51 ` [PATCH 1/3] x86: Hyper-V: register clocksource only if its advertised K. Y. Srinivasan
2013-01-30 0:51 ` [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V K. Y. Srinivasan
2013-01-30 8:53 ` Jan Beulich
2013-01-30 18:12 ` KY Srinivasan
2013-01-30 18:19 ` H. Peter Anvin
2013-01-31 7:37 ` Jan Beulich
2013-01-31 14:46 ` KY Srinivasan
2013-01-31 15:53 ` KY Srinivasan
2013-01-31 16:45 ` Jan Beulich
2013-01-31 18:29 ` H. Peter Anvin
2013-01-31 21:41 ` H. Peter Anvin [this message]
2013-02-01 13:19 ` Stefano Stabellini
2013-02-01 15:10 ` KY Srinivasan
2013-02-01 19:34 ` KY Srinivasan
2013-01-30 0:51 ` [PATCH 3/3] X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts K. Y. Srinivasan
2013-01-30 8:58 ` Jan Beulich
2013-01-31 14:55 ` KY Srinivasan
-- strict thread matches above, loose matches on Subject: below --
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
2013-04-17 7:06 ` Michael S. Tsirkin
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=510AE4F6.1050407@zytor.com \
--to=hpa@zytor.com \
--cc=JBeulich@suse.com \
--cc=apw@canonical.com \
--cc=bp@alien8.de \
--cc=devel@linuxdriverproject.org \
--cc=gregkh@linuxfoundation.org \
--cc=jasowang@redhat.com \
--cc=kys@microsoft.com \
--cc=linux-kernel@vger.kernel.org \
--cc=olaf@aepfle.de \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.