linux-stable.git/arch/x86/kernel/kvmclock.c, branch v3.2

KVM guest: prevent tracing recursion with kvmclock

2011-11-20T08:53:48+00:00

Prevent tracing of preempt_disable() in get_cpu_var() in
kvm_clock_read(). When CONFIG_DEBUG_PREEMPT is enabled,
preempt_disable/enable() are traced and this causes the function_graph
tracer to go into an infinite recursion. By open coding the
preempt_disable() around the get_cpu_var(), we can use the notrace
version which prevents preempt_disable/enable() from being traced and
prevents the recursion.

Based on a similar patch for Xen from Jeremy Fitzhardinge.

Tested-by: Gleb Natapov 
Acked-by: Steven Rostedt 
Signed-off-by: Avi Kivity

KVM guest: KVM Steal time registration

2011-07-24T08:49:36+00:00

This patch implements the kvm bits of the steal time infrastructure.
The most important part of it, is the steal time clock. It is an
continuous clock that shows the accumulated amount of steal time
since vcpu creation. It is supposed to survive cpu offlining/onlining.

[marcelo: fix build with CONFIG_KVM_GUEST=n]

Signed-off-by: Glauber Costa 
Acked-by: Rik van Riel 
Tested-by: Eric B Munson 
CC: Jeremy Fitzhardinge 
CC: Peter Zijlstra 
CC: Avi Kivity 
CC: Anthony Liguori 
Signed-off-by: Avi Kivity 
Signed-off-by: Marcelo Tosatti

x86: Convert remaining x86 clocksources to clocksource_register_hz/khz

2011-02-21T21:33:33+00:00

This converts the remaining x86 clocksources to use
clocksource_register_hz/khz.

CC: jacob.jun.pan@intel.com
CC: Glauber Costa 
CC: Dimitri Sivanich 
CC: Rusty Russell 
CC: Jeremy Fitzhardinge 
CC: Chris McDermott 
CC: Thomas Gleixner 
Tested-by: Konrad Rzeszutek Wilk  [xen]
Signed-off-by: John Stultz

KVM paravirt: Move kvm_smp_prepare_boot_cpu() from kvmclock.c to kvm.c.

2011-01-12T09:23:10+00:00

Async PF also needs to hook into smp_prepare_boot_cpu so move the hook
into generic code.

Acked-by: Rik van Riel 
Signed-off-by: Gleb Natapov 
Signed-off-by: Marcelo Tosatti

KVM guest: Move a printk that's using the clock before it's ready

2010-10-24T08:53:06+00:00

Fix a hang during SMP kernel boot on KVM that showed up
after commit 489fb490dbf8dab0249ad82b56688ae3842a79e8
(2.6.35) and 59aab522154a2f17b25335b63c1cf68a51fb6ae0
(2.6.34.1). The problem only occurs when
CONFIG_PRINTK_TIME is set.

KVM-Stable-Tag.
Signed-off-by: Arjan Koers <0h61vkll2ly8@xutrox.com>
Signed-off-by: Avi Kivity

x86, paravirt: don't compute pvclock adjustments if we trust the tsc

2010-05-19T08:41:05+00:00

If the HV told us we can fully trust the TSC, skip any
correction

Signed-off-by: Glauber Costa 
Acked-by: Zachary Amsden 
Signed-off-by: Marcelo Tosatti

x86: KVM guest: Try using new kvm clock msrs

2010-05-19T08:41:04+00:00

We now added a new set of clock-related msrs in replacement of the old
ones. In theory, we could just try to use them and get a return value
indicating they do not exist, due to our use of kvm_write_msr_save.

However, kvm clock registration happens very early, and if we ever
try to write to a non-existant MSR, we raise a lethal #GP, since our
idt handlers are not in place yet.

So this patch tests for a cpuid feature exported by the host to
decide which set of msrs are supported.

Signed-off-by: Glauber Costa 
Acked-by: Zachary Amsden 
Signed-off-by: Marcelo Tosatti

Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-09-18T21:05:47+00:00

* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (38 commits)
  x86: Move get/set_wallclock to x86_platform_ops
  x86: platform: Fix section annotations
  x86: apic namespace cleanup
  x86: Distangle ioapic and i8259
  x86: Add Moorestown early detection
  x86: Add hardware_subarch ID for Moorestown
  x86: Add early platform detection
  x86: Move tsc_init to late_time_init
  x86: Move tsc_calibration to x86_init_ops
  x86: Replace the now identical time_32/64.c by time.c
  x86: time_32/64.c unify profile_pc
  x86: Move calibrate_cpu to tsc.c
  x86: Make timer setup and global variables the same in time_32/64.c
  x86: Remove mca bus ifdef from timer interrupt
  x86: Simplify timer_ack magic in time_32.c
  x86: Prepare unification of time_32/64.c
  x86: Remove do_timer hook
  x86: Add timer_init to x86_init_ops
  x86: Move percpu clockevents setup to x86_init_ops
  x86: Move xen_post_allocator_init into xen_pagetable_setup_done
  ...

Fix up conflicts in arch/x86/include/asm/io_apic.h

x86: Move get/set_wallclock to x86_platform_ops

2009-09-16T12:34:50+00:00

get/set_wallclock() have already a set of platform dependent
implementations (default, EFI, paravirt). MRST will add another
variant.

Moving them to platform ops simplifies the existing code and minimizes
the effort to integrate new variants.

Signed-off-by: Feng Tang 
LKML-Reference: 
Signed-off-by: Thomas Gleixner

KVM guest: fix bogus wallclock physical address calculation

2009-09-10T07:46:58+00:00

The use of __pa() to calculate the address of a C-visible symbol
is wrong, and can lead to unpredictable results. See arch/x86/include/asm/page.h
for details.

It should be replaced with __pa_symbol(), that does the correct math here,
by taking relocations into account.  This ensures the correct wallclock data
structure physical address is passed to the hypervisor.

Cc: stable@kernel.org
Signed-off-by: Glauber Costa 
Signed-off-by: Avi Kivity