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Re: Use CPUID to communicate with the hypervisor.

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From: Tim Deegan <Tim.Deegan@...>
To: Jeremy Fitzhardinge <jeremy@...>
Cc: <akataria@...>, Ingo Molnar <mingo@...>, H. Peter Anvin <hpa@...>, Thomas Gleixner <tglx@...>, LKML <linux-kernel@...>, the arch/x86 maintainers <x86@...>, avi@redhat.com <avi@...>, Rusty Russell <rusty@...>, Zach Amsden <zach@...>, Daniel Hecht <dhecht@...>, Jun.Nakajima@Intel.Com <Jun.Nakajima@...>
Subject: Re: Use CPUID to communicate with the hypervisor.
Date: Monday, September 29, 2008 - 5:28 am

At 22:01 -0700 on 27 Sep (1222552861), Jeremy Fitzhardinge wrote:


I was talking about checking every 256 leaves from 0x40000000, but I

can't remember where I heard it.  The only relevant reference I can

find is the MS hypervisor interface spec's description of leaf

0x40000001: "Hypervisor vendor-neutral interface identification.  This

determines the semantics of the leaves from 0x40000002 through

0x400000FF"


Cheers,


Tim.


--

Tim Deegan

Principal Software Engineer, Citrix Systems (R&D) Ltd.

[Company #02300071, SL9 0DZ, UK.]

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Messages in current thread:
Use CPUID to communicate with the hypervisor., Alok Kataria, (Fri Sep 26, 7:46 pm)
Re: Use CPUID to communicate with the hypervisor., Gerd Hoffmann, (Mon Sep 29, 4:24 am)
Re: Use CPUID to communicate with the hypervisor., Alok Kataria, (Mon Sep 29, 1:55 pm)
Re: Use CPUID to communicate with the hypervisor., Gerd Hoffmann, (Mon Sep 29, 2:46 pm)
Re: Use CPUID to communicate with the hypervisor., Alok Kataria, (Mon Sep 29, 3:38 pm)
Re: Use CPUID to communicate with the hypervisor., Gerd Hoffmann, (Mon Sep 29, 6:46 pm)
Re: Use CPUID to communicate with the hypervisor., Alok Kataria, (Mon Sep 29, 8:33 pm)
Re: Use CPUID to communicate with the hypervisor., Gerd Hoffmann, (Tue Sep 30, 4:11 am)
[Hypervisors] TSC frequency change, Alok Kataria, (Wed Oct 1, 12:35 am)
Re: [Hypervisors] TSC frequency change, Gerd Hoffmann, (Wed Oct 1, 5:47 am)
Re: Use CPUID to communicate with the hypervisor., Zachary Amsden, (Tue Sep 30, 12:42 pm)
Re: Use CPUID to communicate with the hypervisor., Avi Kivity, (Thu Oct 2, 7:52 am)
RE: Use CPUID to communicate with the hypervisor., Nakajima, Jun, (Mon Sep 29, 4:55 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Mon Sep 29, 5:07 pm)
Re: Use CPUID to communicate with the hypervisor., Jeremy Fitzhardinge, (Mon Sep 29, 5:28 pm)
Re: Use CPUID to communicate with the hypervisor., Alok Kataria, (Mon Sep 29, 8:12 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Mon Sep 29, 8:31 pm)
RE: Use CPUID to communicate with the hypervisor., Nakajima, Jun, (Mon Sep 29, 8:56 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Mon Sep 29, 8:58 pm)
RE: Use CPUID to communicate with the hypervisor., Nakajima, Jun, (Mon Sep 29, 9:14 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Mon Sep 29, 10:21 pm)
RE: Use CPUID to communicate with the hypervisor., Nakajima, Jun, (Mon Sep 29, 11:14 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Mon Sep 29, 11:48 pm)
Re: Use CPUID to communicate with the hypervisor., Zachary Amsden, (Mon Sep 29, 7:20 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Mon Sep 29, 8:33 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Mon Sep 29, 5:49 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Mon Sep 29, 4:31 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Mon Sep 29, 1:58 pm)
Re: Use CPUID to communicate with the hypervisor., Gleb Natapov, (Mon Sep 29, 2:55 am)
Re: Use CPUID to communicate with the hypervisor., Avi Kivity, (Mon Sep 29, 3:37 am)
RE: Use CPUID to communicate with the hypervisor., Nakajima, Jun, (Mon Sep 29, 11:32 am)
Re: Use CPUID to communicate with the hypervisor., Avi Kivity, (Tue Sep 30, 5:16 am)
Re: Use CPUID to communicate with the hypervisor., Bernd Eckenfels, (Mon Sep 29, 5:08 am)
Re: Use CPUID to communicate with the hypervisor., Gleb Natapov, (Mon Sep 29, 5:33 am)
Re: Use CPUID to communicate with the hypervisor., Jeremy Fitzhardinge, (Fri Sep 26, 9:02 pm)
Re: Use CPUID to communicate with the hypervisor., Alok Kataria, (Fri Sep 26, 11:11 pm)
Re: Use CPUID to communicate with the hypervisor., Jeremy Fitzhardinge, (Sun Sep 28, 1:01 am)
Re: Use CPUID to communicate with the hypervisor., Tim Deegan, (Mon Sep 29, 5:28 am)
Re: Use CPUID to communicate with the hypervisor., Avi Kivity, (Mon Sep 29, 5:44 am)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Sat Sep 27, 12:20 am)
Re: Use CPUID to communicate with the hypervisor., Alok Kataria, (Sat Sep 27, 1:37 am)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Fri Sep 26, 9:28 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Fri Sep 26, 8:09 pm)
Re: Use CPUID to communicate with the hypervisor., Karel Zak, (Mon Sep 29, 4:56 pm)
Re: Use CPUID to communicate with the hypervisor., Alok Kataria, (Fri Sep 26, 8:30 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Fri Sep 26, 8:32 pm)
RE: Use CPUID to communicate with the hypervisor., Nakajima, Jun, (Fri Sep 26, 8:59 pm)
Re: Use CPUID to communicate with the hypervisor., H. Peter Anvin, (Fri Sep 26, 9:55 pm)
RE: Use CPUID to communicate with the hypervisor., Nakajima, Jun, (Sat Sep 27, 12:52 am)