When resume from s3, Service VM OS will hang because timer interrupt on
BSP is not triggered. Hypervisor won't update physical timer because
there are expired timers on pcpu timer list.
Add suspend and resume ops for modules that use timers.
This patch is just for Service VM OS. Support for User VM will be added
in the future.
Tracked-On: #8623
Signed-off-by: Haiwei Li <haiwei.li@intel.com>
Per BVT (Borrowed Virtual Time) scheduler design, following per thread
parameters are required to tune scheduling behaviour.
- weight
The time sharing of a thread on CPU.
- warp
Boost value of virtual time of a thread (time borrowed from future) to
reduce Effective Virtual Time to prioritize the thread.
- warp_limit
Max warp time in one warp.
- unwarp_period
Min unwarp time after a warp.
As of now, only weight is in use to tune virtual time ratio of VCPU
threads from different VMs. Others parameters are for future extension.
Tracked-On: #8500
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
Signed-off-by: Qiang Zhang <qiang4.zhang@intel.com>
Abstract out schedulers config data for vCPU threads and other hypervisor
threads to sched_params structure. And it's used to initialize per
thread scheduler private data. The sched_params for vCPU threads come
from vm_config generated by config tools while other hypervisor threads
need give them explicitly.
Tracked-On: #8500
Signed-off-by: Qiang Zhang <qiang4.zhang@intel.com>
When bvt scheduler picks up a thread to run, it sets up a counter
‘run_countdown’ to determine how many ticks it should remain running.
Then the timer will decrease run_countdown by 1 on every 1000Hz tick
interrupt, until it reaches 0. The tick interrupt consumes a lot of
power during idle (if we are using HLT in idle thread).
This patch is to switch the 1000 HZ timer to a dynamic one, which only
interrupt on run_countdown expires.
Tracked-On: #8507
Signed-off-by: Wu Zhou <wu.zhou@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
INIT signal has been used to kick off the partitioned pCPU, like RTVM,
whose LAPIC is pass-through. notification IPI is used to kick off
sharing pCPU.
Add mode_to_kick_pcpu in per-cpu to control the way of kicking
pCPU.
Tracked-On: #8207
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
BVT schedule rule:
When a new thread is wakeup and added to runqueue, it will get the
smallest avt (svt) from runqueue to initiate its avt. If the svt is
smaller than it's avt, it will keep the original avt. With the svt, it
can prevent a thread from claiming an excessive share of CPU after
sleepting for a long time.
For the reboot issue, when the VM is reboot, it means a new vcpu thread
is wakeup, but at this time, the Service VM's vcpu thread is blocked,
and removed from the runqueue, and the runqueue is empty, so the svt is
0. The new vcpu thread will get avt=0. avt=0 means very high priority,
and can run for a very long time until it catch up with other thread's
avt in runqueue.
At this time, when Service VM's vcpu thread wakeup, it will check the
svt, but the svt is very small, so will not update it's avt according to
the rule, thus has a very low priority and cannot be scheduled.
To fix it, update svt in pick_next handler to make sure svt is align
with the avt of the first obj in runqueue.
Tracked-On: #7944
Signed-off-by: Conghui <conghui.chen@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>
Reviewed-by: Wang, Yu1 <yu1.wang@intel.com>
Modified the copyright year range in code, and corrected "int32_tel"
into "Intel" in two "hypervisor/include/debug/profiling.h" and
"hypervisor/include/debug/profiling_internal.h".
Tracked-On: #7559
Signed-off-by: Ziheng Li <ziheng.li@intel.com>
Many of the license and Intel copyright headers include the "All rights
reserved" string. It is not relevant in the context of the BSD-3-Clause
license that the code is released under. This patch removes those strings
throughout the code (hypervisor, devicemodel and misc).
Tracked-On: #7254
Signed-off-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
1. do not allow external modules to touch internal field of a timer.
2. make timer mode internal, period_in_ticks will decide the mode.
API wise:
1. the "mode" parameter was taken out of initialize_timer().
2. a new function update_timer() was added to update the timeout and
period fields.
3. the timer_expired() function was extended with an output parameter
to return the remaining cycles before expiration.
Also, the "fire_tsc" field name of hv_timer was renamed to "timeout".
With the new API, however, this change should not concern user code.
Tracked-On: #5920
Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Generalize and split basic cpu cycle/tick routines from x86/timer:
- Instead of rdstc(), use cpu_ticks() in generic code.
- Instead of get_tsc_khz(), use cpu_tickrate() in generic code.
- Include "common/ticks.h" instead of "x86/timer.h" in generic code.
- CYCLES_PER_MS is renamed to TICKS_PER_MS.
The x86 specific API rdstc() and get_tsc_khz(), as well as TSC_PER_MS
are still available in arch/x86/tsc.h but only for x86 specific usage.
Tracked-On: #5920
Signed-off-by: Rong Liu <rong2.liu@intel.com>
Signed-off-by: Yi Liang <yi.liang@intel.com>
Instead of "#include <x86/foo.h>", use "#include <asm/foo.h>".
In other words, we are adopting the same practice in Linux kernel.
Tracked-On: #5920
Signed-off-by: Liang Yi <yi.liang@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Requires explicit arch path name in the include directive.
The config scripts was also updated to reflect this change.
Tracked-On: #5825
Signed-off-by: Peter Fang <peter.fang@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
This function casts a member of a structure out to the containing structure.
So rename to container_of is more readable.
Tracked-On: #4550
Signed-off-by: Li Fei1 <fei1.li@intel.com>
Count down number will be decreased at each tick, when it comes to zero,
it will trigger reschedule.
Tracked-On: #4410
Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
pick_next function will update the virtual time parameters, and return
the vcpu thread with earlest evt. Calculate the count down number for
the picked vcpu thread, it means how many mcu a thread can run before
the next reschedule occur.
Tracked-On: #4410
Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
In the wakeup handler, the vcpu_thread object will be inserted into the
runqueue, and in the sleep handler, it will be removed from the queue.
vcpu_thread object is ordered by EVT (effective virtual time).
Tracked-On: #4410
Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
Add init function for bvt scheduler, creating a runqueue and a period
timer, the timer interval is default as 1ms. The interval is the minimum
charging unit.
Tracked-On: #4410
Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
BVT (Borrowed virtual time) scheduler is used to schedule vCPUs on pCPU.
It has the concept of virtual time, vCPU with earliset virtual time is
dispatched first.
Main concepts:
tick timer:
a period tick is used to measure the physcial time in units of MCU
(minimum charing unit).
runqueue:
thread in the runqueue is ordered by virtual time.
weight:
each thread receives a share of the pCPU in proportion to its
weight.
context switch allowance:
the physcial time by which the current thread is allowed to advance
beyond the next runnable thread.
warp:
a thread with warp enabled will have a change to minus a value (Wi)
from virtual time to achieve higher priority.
virtual time:
AVT: actual virtual time, advance in proportional to weight.
EVT: effective virtual time.
EVT <- AVT - ( warp ? Wi : 0 )
SVT: scheduler virtual time, the minimum AVT in the runqueue.
Tracked-On: #4410
Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
Haiwei Li