kernel.git/arch/x86/include/asm/pvclock.h, branch linux-3.17.y

pvclock: detect watchdog reset at pvclock read

2013-11-06T07:48:43Z

Implement reset of kernel watchdogs at pvclock read time. This avoids adding special code to every watchdog. This is possible for watchdogs which measure time based on sched_clock() or ktime_get() variants. Suggested by Don Zickus. Acked-by: Don Zickus Acked-by: Paolo Bonzini Signed-off-by: Marcelo Tosatti Signed-off-by: Gleb Natapov

remove sched notifier for cross-cpu migrations

2013-07-18T10:29:30Z

Linux as a guest on KVM hypervisor, the only user of the pvclock vsyscall interface, does not require notification on task migration because: 1. cpu ID number maps 1:1 to per-CPU pvclock time info. 2. per-CPU pvclock time info is updated if the underlying CPU changes. 3. that version is increased whenever underlying CPU changes. Which is sufficient to guarantee nanoseconds counter is calculated properly. Signed-off-by: Marcelo Tosatti Acked-by: Peter Zijlstra Signed-off-by: Gleb Natapov

x86: pvclock: generic pvclock vsyscall initialization

2012-11-28T01:29:09Z

Originally from Jeremy Fitzhardinge. Introduce generic, non hypervisor specific, pvclock initialization routines. Signed-off-by: Marcelo Tosatti

x86: pvclock: add note about rdtsc barriers

2012-11-28T01:29:08Z

As noted by Gleb, not advertising SSE2 support implies no RDTSC barriers. Signed-off-by: Marcelo Tosatti

x86: pvclock: introduce helper to read flags

2012-11-28T01:29:08Z

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

x86: pvclock: create helper for pvclock data retrieval

2012-11-28T01:29:07Z

Originally from Jeremy Fitzhardinge. So code can be reused. Acked-by: Glauber Costa Signed-off-by: Marcelo Tosatti

KVM: Fix instruction size issue in pvclock scaling

2011-08-30T11:42:30Z

Commit de2d1a524e94 ("KVM: Fix register corruption in pvclock_scale_delta") introduced a mul instruction that may have only a memory operand; the assembler therefore cannot select the correct size: pvclock.s:229: Error: no instruction mnemonic suffix given and no register operands; can't size instruction In this example the assembler is: #APP mul -48(%rbp) ; shrd $32, %rdx, %rax #NO_APP A simple solution is to use mulq. Signed-off-by: Duncan Sands Signed-off-by: Avi Kivity

KVM: Fix register corruption in pvclock_scale_delta

2011-06-19T16:23:14Z

The 128-bit multiply in pvclock.h was missing an output constraint for EDX which caused a register corruption to appear. Thanks to Ulrich for diagnosing the EDX corruption and Avi for providing this fix. Signed-off-by: Zachary Amsden Signed-off-by: Avi Kivity

x86/pvclock: Zero last_value on resume

2010-11-28T08:33:20Z

If the guest domain has been suspend/resumed or migrated, then the system clock backing the pvclock clocksource may revert to a smaller value (ie, can be non-monotonic across the migration/save-restore). Make sure we zero last_value in that case so that the domain continues to see clock updates. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ingo Molnar

x86: pvclock: Move scale_delta into common header

2010-10-24T08:51:24Z

The scale_delta function for shift / multiply with 31-bit precision moves to a common header so it can be used by both kernel and kvm module. Signed-off-by: Zachary Amsden Signed-off-by: Marcelo Tosatti