linux-stable.git/arch/x86/kernel/cpu/mshyperv.c, branch linux-3.12.y

x86, hyperv: Mark the Hyper-V clocksource as being continuous

2015-01-29T14:45:04+00:00

commit 32c6590d126836a062b3140ed52d898507987017 upstream.

The Hyper-V clocksource is continuous; mark it accordingly.

Signed-off-by: K. Y. Srinivasan 
Acked-by: jasowang@redhat.com
Cc: gregkh@linuxfoundation.org
Cc: devel@linuxdriverproject.org
Cc: olaf@aepfle.de
Cc: apw@canonical.com
Link: http://lkml.kernel.org/r/1421108762-3331-1-git-send-email-kys@microsoft.com
Signed-off-by: Thomas Gleixner 
Signed-off-by: Jiri Slaby

x86: Correctly detect hypervisor

2013-08-05T13:35:33+00:00

We try to handle the hypervisor compatibility mode by detecting hypervisor
through a specific order. This is not robust, since hypervisors may implement
each others features.

This patch tries to handle this situation by always choosing the last one in the
CPUID leaves. This is done by letting .detect() return a priority instead of
true/false and just re-using the CPUID leaf where the signature were found as
the priority (or 1 if it was found by DMI). Then we can just pick hypervisor who
has the highest priority. Other sophisticated detection method could also be
implemented on top.

Suggested by H. Peter Anvin and Paolo Bonzini.

Acked-by: K. Y. Srinivasan 
Cc: Haiyang Zhang 
Cc: Konrad Rzeszutek Wilk 
Cc: Jeremy Fitzhardinge 
Cc: Doug Covelli 
Cc: Borislav Petkov 
Cc: Dan Hecht 
Cc: Paul Gortmaker 
Cc: Marcelo Tosatti 
Cc: Gleb Natapov 
Cc: Paolo Bonzini 
Cc: Frederic Weisbecker 
Signed-off-by: Jason Wang 
Link: http://lkml.kernel.org/r/1374742475-2485-4-git-send-email-jasowang@redhat.com
Signed-off-by: H. Peter Anvin

x86, hyperv: Handle Xen emulation of Hyper-V more gracefully

2013-04-18T15:59:20+00:00

Install the Hyper-V specific interrupt handler only when needed. This would
permit us to get rid of the Xen check. Note that when the vmbus drivers invokes
the call to register its handler, we are sure to be running on Hyper-V.

Signed-off-by: K. Y. Srinivasan 
Link: http://lkml.kernel.org/r/1366299886-6399-1-git-send-email-kys@microsoft.com
Acked-by: Michael S. Tsirkin 
Signed-off-by: H. Peter Anvin

X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts

2013-02-13T00:27:15+00:00

Starting with win8, vmbus interrupts can be delivered on any VCPU in the guest
and furthermore can be concurrently active on multiple VCPUs. Support this
interrupt delivery model by setting up a separate IDT entry for Hyper-V vmbus.
interrupts. I would like to thank Jan Beulich  and
Thomas Gleixner , for their help.

In this version of the patch, based on the feedback, I have merged the IDT
vector for Xen and Hyper-V and made the necessary adjustments. Furhermore,
based on Jan's feedback I have added the necessary compilation switches.

Signed-off-by: K. Y. Srinivasan 
Link: http://lkml.kernel.org/r/1359940959-32168-3-git-send-email-kys@microsoft.com
Signed-off-by: H. Peter Anvin

X86: Add a check to catch Xen emulation of Hyper-V

2013-02-13T00:27:03+00:00

Xen emulates Hyper-V to host enlightened Windows. Looks like this
emulation may be turned on by default even for Linux guests. Check and
fail Hyper-V detection if we are on Xen.

[ hpa: the problem here is that Xen doesn't emulate Hyper-V well
  enough, and if the Xen support isn't compiled in, we end up stubling
  over the Hyper-V emulation and try to activate it -- and it fails. ]

Signed-off-by: K. Y. Srinivasan 
Link: http://lkml.kernel.org/r/1359940959-32168-2-git-send-email-kys@microsoft.com
Signed-off-by: H. Peter Anvin

x86: Hyper-V: register clocksource only if its advertised

2013-02-13T00:25:48+00:00

Enable hyperv_clocksource only if its advertised as a feature.
XenServer 6 returns the signature which is checked in
ms_hyperv_platform(), but it does not offer all features. Currently the
clocksource is enabled unconditionally in ms_hyperv_init_platform(), and
the result is a hanging guest.

Hyper-V spec Bit 1 indicates the availability of Partition Reference
Counter.  Register the clocksource only if this bit is set.

The guest in question prints this in dmesg:
 [    0.000000] Hypervisor detected: Microsoft HyperV
 [    0.000000] HyperV: features 0x70, hints 0x0

This bug can be reproduced easily be setting 'viridian=1' in a HVM domU
.cfg file. A workaround without this patch is to boot the HVM guest with
'clocksource=jiffies'.

Signed-off-by: Olaf Hering 
Link: http://lkml.kernel.org/r/1359940959-32168-1-git-send-email-kys@microsoft.com
Signed-off-by: K. Y. Srinivasan 
Cc: 
Cc: Greg KH 
Signed-off-by: H. Peter Anvin

x86: Hyper-V: Integrate the clocksource with Hyper-V detection code

2011-09-08T08:33:59+00:00

The Hyper-V clocksource driver is best integrated with Hyper-V
detection code since: 

  (a) Linux guests running on Hyper-V require it

  (b) Integration into that code significanly reduces code size

Signed-off-by: K. Y. Srinivasan 
Signed-off-by: Haiyang Zhang 
Cc: gregkh@suse.de
Cc: devel@linuxdriverproject.org
Cc: virtualization@lists.osdl.org
Link: http://lkml.kernel.org/r/1315434310-4827-1-git-send-email-kys@microsoft.com
Signed-off-by: Thomas Gleixner

x86: Export the symbol ms_hyperv

2010-07-08T21:12:03+00:00

This is needed so that the staging hyperv can properly access this
symbol.

Signed-off-by: K. Y. Srinivasan 
Acked-by: H. Peter Anvin 
Signed-off-by: Greg Kroah-Hartman

x86, hypervisor: add missing

2010-05-10T05:46:54+00:00

EXPORT_SYMBOL() needs  to be included; fixes modular
builds of the VMware balloon driver, and any future modular drivers
which depends on the hypervisor.

Reported-by: Ingo Molnar 
Signed-off-by: H. Peter Anvin 
Cc: Greg KH 
Cc: Hank Janssen 
Cc: Alok Kataria 
Cc: Ky Srinivasan 
Cc: Dmitry Torokhov 
LKML-Reference: <4BE49778.6060800@zytor.com>

x86, hypervisor: Export the x86_hyper* symbols

2010-05-09T08:10:34+00:00

Export x86_hyper and the related specific structures, allowing for
hypervisor identification by modules.

Signed-off-by: H. Peter Anvin 
Cc: Greg KH 
Cc: Hank Janssen 
Cc: Alok Kataria 
Cc: Ky Srinivasan 
Cc: Dmitry Torokhov 
LKML-Reference: <4BE49778.6060800@zytor.com>