| Commit message (Collapse) | Author | Age | Files | Lines |
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Mitigate the heavy contention on handle_pmt_io when running a HVM
configured with many cores (e.g., 32 cores). As the virtual time of a
domain must be fresh, there should be someone updating it,
periodically. But it is not necessary to let a VCPU update the virtual
time when another one has been updating it. Thus the update can be
skipped when the VCPU finds someone else is updating the virtual time.
So every time a VCPU invoke handle_pmt_io to update the current
domain's virtual time, it will first try to acquire the pmtimer lock.
If it succeeds, it will update the virtual time. Otherwise, it can
skip the update, waits for the pmtimer lock holder to finish updating
the virtual time and returns the updated time.
Signed-off-by: Xiang Song <xiangsong@fudan.edu.cn>
Signed-off-by: Keir Fraser <keir@xen.org>
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Primarily fix up register names in public header file for
compatibility with old unmodified versions of virtual firmware and
qemu-dm. Also fixes a bug in the read case of handle_evt_io().
Signed-off-by: Keir Fraser <keir@xen.org>
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By default, Xen will handle the old ACPI IO port. But it can switch to
the new one by setting the HVM_PARAM_ACPI_IOPORTS_LOCATION to 1.
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Keir Fraser <keir@xen.org>
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Several seconds of backward time drift per minute can be seen on a
RHEL6 HVM guest by switching the clocksource to 'acpi_pm' and then
running gettimeofday() in a loop. This is due to the accumulation
of small inaccuracies that are caused by shifting out the lower 32
bits when pmt_update_time() computes 'tmr_val'.
The patch makes sure that the lower 32 bits of the computed value
are not lost. They are saved in a new field 'not_accounted' in the
PMTState structure and are accounted the next time pmt_update_time()
is called.
From: Ulrich Obergfell <uobergfe@redhat.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
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Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
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- remove redundant declarations
- add/move prototypes to headers
- move things where they belong to
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
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This patch adds the ACPI fixed hardware power button for HVM.
It enables a graceful shutdown of a guest OS by direction of Dom0.
(if a proper action for the power button is set inside the guest)
usage:
xm trigger <Domain> power
Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
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Move hvm platform timers from underlying physical CPU TSC to Xen
system time and ensure domain-wide monotonicity. TSC on many systems
may skew between processors leading to 'time going backwards' messages
from some guests.
Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
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Signed-off-by: Tian Kevin <kevin.tian@intel.com>
Signed-off-by: Yu Ke <ke.yu@intel.com>
Signed-off-by: Ke Liping <liping.ke@intel.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
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Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
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instructions.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
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Handy for correctness.
Signed-off-by: Keir Fraser <keir@xensource.com>
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Too many ACPI events (SCI) are raised on hvm because of
multiplication overflow.
FREQUENCE_PMTIMER=3579545
(1000000000ULL << 32) / FREQUENCE_PMTIMER = 0xae9a7b1663a
pmt_cycles_until_flip =~ 0x80000000
0xae9a7b1663a*0x80000000 = overflow!!!
Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
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Signed-off-by: Tim Deegan <Tim.Deegan@xensource.com>
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Bring the PM1a_STS and PM1a_EN registers into Xen and use them to deliver
SCI to the guest before it sees the MSB of the pm-timer change.
Also correct some of the semantics of the registers.
Signed-off-by: Tim Deegan <Tim.Deegan@xensource.com>
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Also remove the repeating timer from pmtimer.c because it doesn't do anything.
Signed-off-by: Tim Deegan <Tim.Deegan@xensource.com>
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programmed as periodic timer and adds them to abstract layer, which
keeps track of pending_intr_nr to avoid time interrupt lost and
sync'ed timer with TSC.
It also makes some cleanup to the time related code.
Signed-off-by: Xiaowei Yang <xiaowei.yang@intel.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
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and extra code in hvm_vcpu_initialise(). Remove 'apic' config
option -- HVM CPUs will always have an APIC (which should be
set up in virtual wire mode for backward compatibility, just as
in a real system).
Signed-off-by: Keir Fraser <keir@xensource.com>
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Guest physical addresses are not guaranteed to fit in either a pointer
or an unsigned long int; use paddr_t for them.
Signed-off-by: Tim Deegan <Tim.Deegan@xensource.com>
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We found Vista polls ACPI timer very frequently (about 15 times
averagely) when handling timer (RTC @ 64HZ) interrupt routine. Though
the exact reason is known, it should be related to system time
adjustment. When it's in Qemu, the overhead is big. After moving,
Vista's idle overhead decreases dramatically from ~10% to 0.9%.=20
Another benefit is that Vista can only pass Performance rating with
this patch. The root cause is that ACPI timer in Qemu isn't
synchronous with other platform timer in HV, which results in Vista
complains "can't measure TSC frequency".
This patch changes vpit.h to vpt.h, for it not only has pit structure
in it, but other platform timer's structure. Another change is moving
ACPI timer and related address from acpi.h to ioreq.h, which can be shared
by HV and ACPI firmware.
Signed-off-by: Xiaowei Yang <xiaowei.yang@intel.com>
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