kernel/linux.git/arch/powerpc/kvm/timing.c, branch linux-4.4.y

KVM: PPC: Remove DCR handling

2014-07-28T17:29:15+00:00

DCR handling was only needed for 440 KVM. Since we removed it, we can also remove handling of DCR accesses. Signed-off-by: Alexander Graf

KVM: PPC: fix partial application of "exit timing in ticks"

2011-07-12T10:16:28+00:00

When http://www.spinics.net/lists/kvm-ppc/msg02664.html was applied to produce commit b51e7aa7ed6d8d134d02df78300ab0f91cfff4d2, the removal of the conversion in add_exit_timing was left out. Signed-off-by: Stuart Yoder Signed-off-by: Scott Wood Signed-off-by: Alexander Graf

KVM: PPC: use ticks, not usecs, for exit timing

2011-05-22T12:47:49+00:00

Convert to microseconds when displaying (with fix from Bharat Bhushan ). This reduces rounding error with large quantities of short exits. Signed-off-by: Stuart Yoder Signed-off-by: Scott Wood Signed-off-by: Alexander Graf

KVM: PPC: Fix issue clearing exit timing counters

2011-05-11T11:57:04+00:00

Following dump is observed on host when clearing the exit timing counters [root@p1021mds kvm]# echo -n 'c' > vm1200_vcpu0_timing INFO: task echo:1276 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. echo D 0ff5bf94 0 1276 1190 0x00000000 Call Trace: [c2157e40] [c0007908] __switch_to+0x9c/0xc4 [c2157e50] [c040293c] schedule+0x1b4/0x3bc [c2157e90] [c04032dc] __mutex_lock_slowpath+0x74/0xc0 [c2157ec0] [c00369e4] kvmppc_init_timing_stats+0x20/0xb8 [c2157ed0] [c0036b00] kvmppc_exit_timing_write+0x84/0x98 [c2157ef0] [c00b9f90] vfs_write+0xc0/0x16c [c2157f10] [c00ba284] sys_write+0x4c/0x90 [c2157f40] [c000e320] ret_from_syscall+0x0/0x3c The vcpu->mutex is used by kvm_ioctl_* (KVM_RUN etc) and same was used when clearing the stats (in kvmppc_init_timing_stats()). What happens is that when the guest is idle then it held the vcpu->mutx. While the exiting timing process waits for guest to release the vcpu->mutex and a hang state is reached. Now using seprate lock for exit timing stats. Signed-off-by: Bharat Bhushan Acked-by: Alexander Graf Signed-off-by: Avi Kivity

KVM: PPC: BookE: fix sleep with interrupts disabled

2010-11-05T16:42:28+00:00

It is not legal to call mutex_lock() with interrupts disabled. This will assert with debug checks enabled. If there's a real need to disable interrupts here, it could be done after the mutex is acquired -- but I don't see why it's needed at all. Signed-off-by: Scott Wood Reviewed-by: Christian Ehrhardt Signed-off-by: Alexander Graf

powerpc: Remove unnecessary casts of private_data

2010-07-31T04:56:31+00:00

Signed-off-by: Joe Perches Signed-off-by: Benjamin Herrenschmidt

powerpc/kvm: Fix non-modular build

2009-11-05T06:17:12+00:00

Signed-off-by: Benjamin Herrenschmidt

const: constify remaining file_operations

2009-10-01T23:11:11+00:00

[akpm@linux-foundation.org: fix KVM] Signed-off-by: Alexey Dobriyan Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

KVM: ppc: mostly cosmetic updates to the exit timing accounting code

2008-12-31T14:55:41+00:00

The only significant changes were to kvmppc_exit_timing_write() and kvmppc_exit_timing_show(), both of which were dramatically simplified. Signed-off-by: Hollis Blanchard Signed-off-by: Avi Kivity

KVM: ppc: Implement in-kernel exit timing statistics

2008-12-31T14:55:41+00:00

Existing KVM statistics are either just counters (kvm_stat) reported for KVM generally or trace based aproaches like kvm_trace. For KVM on powerpc we had the need to track the timings of the different exit types. While this could be achieved parsing data created with a kvm_trace extension this adds too much overhead (at least on embedded PowerPC) slowing down the workloads we wanted to measure. Therefore this patch adds a in-kernel exit timing statistic to the powerpc kvm code. These statistic is available per vm&vcpu under the kvm debugfs directory. As this statistic is low, but still some overhead it can be enabled via a .config entry and should be off by default. Since this patch touched all powerpc kvm_stat code anyway this code is now merged and simplified together with the exit timing statistic code (still working with exit timing disabled in .config). Signed-off-by: Christian Ehrhardt Signed-off-by: Hollis Blanchard Signed-off-by: Avi Kivity