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Disable the intel_iommu by default since the CICD platform has something
wrong on the VT-d support
Enable the X2APIC support, otherwwise there will be only one CPU
available.
Change-Id: I69206363fa61c751ad982be74db84b020a1c3748
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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The current kernel is based on rt kernel v4.4.6-rt14. We will upgrade it
to 4.4.50-rt62.
The command to achieve it is:
a) Clone a git repo from
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git
b) Get the diff between this two changesets:
git diff 640eca2901f3435e616157b11379d3223a44b391
705619beeea1b0b48219a683fd1a901a86fdaf5e
where the two commits are:
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
640eca2901f3435e616157b11379d3223a44b391
640eca2901f3 v4.4.6-rt14
localversion-rt
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
705619beeea1b0b48219a683fd1a901a86fdaf5e
705619beeea1 Linux 4.4.50-rt62
localversion-rt
c) One patch has been backported thus revert the patch before applying.
filterdiff -p1 -x scripts/package/Makefile
~/tmp/v4.4.6-rt14-4.4.50-rt62.diff |patch -p1 --dry-run
Upstream status: backport
Change-Id: I244d57a32f6066e5a5b9915f9fbf99e7bbca6e01
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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As ubuntu 16.04 is using the same version kernel, we try to reuse the
config file from ubuntu server release.
Also added one rpm package required for building the new kernel config.
upstream-status: N/A
Change-Id: I471918eb1840bd36ba569abb63b2fa0b3d2fb4f3
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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filter modules to unblock port 22 for enabling ssh.
Change-Id: Ia046e336719bf1b5cfedf3426b58920268bce671
Signed-off-by: Gundarapu Kalyan Reddy <reddyx.gundarapu@intel.com>
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CIFS and FUSE modules and updated scripts to check whether the
node is up and running before execution of each test case.
Change-Id: Ieebb693229d24e89d7ce92b0c1a26de411cce590
Signed-off-by: Gundarapu Kalyan Reddy <reddyx.gundarapu@intel.com>
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The barometer need the mce_inject for testing. Enable it on the kernel.
Upstream status: N/A
Change-Id: I0dd94984198b1d1c49a051cd5e70d62087aa81f1
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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This patch, together with previous TSC calculation patch,
fixes duplicate timer interrupt on the guest.
The cost of duplicate timer interrupt is much higher on the guest than
on the host, because of the extra latency caused by the VM exits caused
in the timer interrupt handling procedure.
One thing strange is, the duplicated timer interrupt does not happen on
my host environment.
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Backport-by: Yunhong Jiang <yunhong.jiang@intel.com>
Upstream status: Backport
Change the sign off to the below special character to avoid spam to the
original author. And removed the CC/ack list.
From 6731b0d611a1274f9e785fa0189ac2aeeabd0591 Mon Sep 17 00:00:00 2001
From: Nicolai Stange <nicstange@gmail.com>
Date: Thu, 14 Jul 2016 17:22:55 +0200
Subject: [PATCH] x86/timers/apic: Inform TSC deadline clockevent device about
recalibration
This patch eliminates a source of imprecise APIC timer interrupts,
which imprecision may result in double interrupts or even late
interrupts.
The TSC deadline clockevent devices' configuration and registration
happens before the TSC frequency calibration is refined in
tsc_refine_calibration_work().
This results in the TSC clocksource and the TSC deadline clockevent
devices being configured with slightly different frequencies: the former
gets the refined one and the latter are configured with the inaccurate
frequency detected earlier by means of the "Fast TSC calibration using PIT".
Within the APIC code, introduce the notifier function
lapic_update_tsc_freq() which reconfigures all per-CPU TSC deadline
clockevent devices with the current tsc_khz.
Call it from the TSC code after TSC calibration refinement has happened.
s1gned 0ff by: Nicolai Stange <nicstange@gmail.com>
s1gned 0ff by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160714152255.18295-3-nicstange@gmail.com
[ Pushed #ifdef CONFIG_X86_LOCAL_APIC into header, improved changelog. ]
s1gned 0ff by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/apic.h | 2 ++
arch/x86/kernel/apic/apic.c | 24 ++++++++++++++++++++++++
arch/x86/kernel/tsc.c | 4 ++++
3 files changed, 30 insertions(+)
Change-Id: I89e75627ef32846f96b725a8a4ad8cbfe487bd3a
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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roundoff error
This patch, together with followed patches about the TSC recalibration,
fixed duplicate timer interrupt on the guest.
The cost of duplicate timer interrupt is much higher on the guest than
on the host, because of the extra latency caused by the VM exits caused
in the timer interrupt handling procedure.
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Backport-by: Yunhong Jiang <yunhong.jiang@intel.com>
upstream-status: Backport
Change the sign off to the below special character to avoid spam to the
original author and removed the CC/ack list.
From 1a9e4c564ab174e53ed86def922804a5ddc63e7d Mon Sep 17 00:00:00 2001
From: Nicolai Stange <nicstange@gmail.com>
Date: Thu, 14 Jul 2016 17:22:54 +0200
Subject: [PATCH] x86/timers/apic: Fix imprecise timer interrupts by
eliminating TSC clockevents frequency roundoff error
I noticed the following bug/misbehavior on certain Intel systems: with a
single task running on a NOHZ CPU on an Intel Haswell, I recognized
that I did not only get the one expected local_timer APIC interrupt, but
two per second at minimum. (!)
Further tracing showed that the first one precedes the programmed deadline
by up to ~50us and hence, it did nothing except for reprogramming the TSC
deadline clockevent device to trigger shortly thereafter again.
The reason for this is imprecise calibration, the timeout we program into
the APIC results in 'too short' timer interrupts. The core (hr)timer code
notices this (because it has a precise ktime source and sees the short
interrupt) and fixes it up by programming an additional very short
interrupt period.
This is obviously suboptimal.
The reason for the imprecise calibration is twofold, and this patch
fixes the first reason:
In setup_APIC_timer(), the registered clockevent device's frequency
is calculated by first dividing tsc_khz by TSC_DIVISOR and multiplying
it with 1000 afterwards:
(tsc_khz / TSC_DIVISOR) * 1000
The multiplication with 1000 is done for converting from kHz to Hz and the
division by TSC_DIVISOR is carried out in order to make sure that the final
result fits into an u32.
However, with the order given in this calculation, the roundoff error
introduced by the division gets magnified by a factor of 1000 by the
following multiplication.
To fix it, reversing the order of the division and the multiplication a la:
(tsc_khz * 1000) / TSC_DIVISOR
... reduces the roundoff error already.
Furthermore, if TSC_DIVISOR divides 1000, associativity holds:
(tsc_khz * 1000) / TSC_DIVISOR = tsc_khz * (1000 / TSC_DIVISOR)
and thus, the roundoff error even vanishes and the whole operation can be
carried out within 32 bits.
The powers of two that divide 1000 are 2, 4 and 8. A value of 8 for
TSC_DIVISOR still allows for TSC frequencies up to
2^32 / 10^9ns * 8 = 34.4GHz which is way larger than anything to expect
in the next years.
Thus we also replace the current TSC_DIVISOR value of 32 by 8. Reverse
the order of the divison and the multiplication in the calculation of
the registered clockevent device's frequency.
S1gned 0ff by: Nicolai Stange <nicstange@gmail.com>
S1gned 0ff-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Removed the CC/Ack list here.
Link: http://lkml.kernel.org/r/20160714152255.18295-2-nicstange@gmail.com
[ Improved changelog. ]
S1gned 0ff by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/apic/apic.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
Change-Id: I6a153d62bbeabee6ea2fce5e1770bb6656ed637c
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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This NIC is used on Ericsson CI POD2
JIRA: KVMFORNFV-45
JIRA: FUEL-171
upstream-status: N/A
Change-Id: I3b1ab07388719380d288cb0d8c2a2af52510303d
Signed-off-by: Michal Skalski <mskalski@mirantis.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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Because the vmcs12 preemption timer is emulated through a separate hrtimer,
we can keep on using the preemption timer in the vmcs02 to emulare L1's
TSC deadline timer.
However, the corresponding bit in the pin-based execution control field
must be kept consistent between vmcs01 and vmcs02. On vmentry we copy
it into the vmcs02; on vmexit the preemption timer must be disabled in
the vmcs01 if a preemption timer vmexit happened while in guest mode.
The preemption timer value in the vmcs02 is set by vmx_vcpu_run, so it
need not be considered in prepare_vmcs02.
Cc: Yunhong Jiang <yunhong.jiang@intel.com>
Cc: Haozhong Zhang <haozhong.zhang@intel.com>
Tested-by: Wanpeng Li <kernellwp@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Change-Id: Iffaea7689d4e653dc6224a6f05c6e5ba2fb5c8a8
upstream-status: backport
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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The preemption timer for nested VMX is emulated by hrtimer which is started on L2
entry, stopped on L2 exit and evaluated via the check_nested_events hook. However,
nested_vmx_exit_handled is always returning true for preemption timer vmexit. Then,
the L1 preemption timer vmexit is captured and be treated as a L2 preemption
timer vmexit, causing NULL pointer dereferences or worse in the L1 guest's
vmexit handler:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [< (null)>] (null)
PGD 0
Oops: 0010 [#1] SMP
Call Trace:
? kvm_lapic_expired_hv_timer+0x47/0x90 [kvm]
handle_preemption_timer+0xe/0x20 [kvm_intel]
vmx_handle_exit+0x169/0x15a0 [kvm_intel]
? kvm_arch_vcpu_ioctl_run+0xd5d/0x19d0 [kvm]
kvm_arch_vcpu_ioctl_run+0xdee/0x19d0 [kvm]
? kvm_arch_vcpu_ioctl_run+0xd5d/0x19d0 [kvm]
? vcpu_load+0x1c/0x60 [kvm]
? kvm_arch_vcpu_load+0x57/0x260 [kvm]
kvm_vcpu_ioctl+0x2d3/0x7c0 [kvm]
do_vfs_ioctl+0x96/0x6a0
? __fget_light+0x2a/0x90
SyS_ioctl+0x79/0x90
do_syscall_64+0x68/0x180
entry_SYSCALL64_slow_path+0x25/0x25
Code: Bad RIP value.
RIP [< (null)>] (null)
RSP <ffff8800b5263c48>
CR2: 0000000000000000
---[ end trace 9c70c48b1a2bc66e ]---
This can be reproduced readily by preemption timer enabled on L0 and disabled
on L1.
Return false since preemption timer vmexits must never be reflected to L2.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Yunhong Jiang <yunhong.jiang@intel.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Haozhong Zhang <haozhong.zhang@intel.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Change-Id: Iaffcd503666879e8157c8559876330110a66e5c4
upstream-status: backport
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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Simplify cpu_has_vmx_preemption_timer. This is consistent with the
rest of setup_vmcs_config and preparatory for the next patch.
Tested-by: Wanpeng Li <kernellwp@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Change-Id: I3b33a881c5e47d5d3046e28374d0b0ca363ffad7
upstream-status: backport
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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INFO: rcu_sched detected stalls on CPUs/tasks:
1-...: (11800 GPs behind) idle=45d/140000000000000/0 softirq=0/0 fqs=21663
(detected by 0, t=65016 jiffies, g=11500, c=11499, q=719)
Task dump for CPU 1:
qemu-system-x86 R running task 0 3529 3525 0x00080808
ffff8802021791a0 ffff880212895040 0000000000000001 00007f1c2c00db40
ffff8801dd20fcd3 ffffc90002b98000 ffff8801dd20fc88 ffff8801dd20fcf8
0000000000000286 ffff8801dd2ac538 ffff8801dd20fcc0 ffffffffc06949c9
Call Trace:
? kvm_write_guest_cached+0xb9/0x160 [kvm]
? __delay+0xf/0x20
? wait_lapic_expire+0x14a/0x200 [kvm]
? kvm_arch_vcpu_ioctl_run+0xcbe/0x1b00 [kvm]
? kvm_arch_vcpu_ioctl_run+0xe34/0x1b00 [kvm]
? kvm_vcpu_ioctl+0x2d3/0x7c0 [kvm]
? __fget+0x5/0x210
? do_vfs_ioctl+0x96/0x6a0
? __fget_light+0x2a/0x90
? SyS_ioctl+0x79/0x90
? do_syscall_64+0x7c/0x1e0
? entry_SYSCALL64_slow_path+0x25/0x25
This can be reproduced readily by running a full dynticks guest(since hrtimer
in guest is heavily used) w/ lapic_timer_advance disabled.
If fail to program hardware preemption timer, we will fallback to hrtimer based
method, however, a previous programmed preemption timer miss to cancel in this
scenario which results in one hardware preemption timer and one hrtimer emulated
tsc deadline timer run simultaneously. So sometimes the target guest deadline
tsc is earlier than guest tsc, which leads to the computation in vmx_set_hv_timer
can underflow and cause delta_tsc to be set a huge value, then host soft lockup
as above.
This patch fix it by cancelling the previous programmed preemption timer if there
is once we failed to program the new preemption timer and fallback to hrtimer
based method.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Change-Id: I8a2decefab743aecdfab676fb9267324bf42b848
upstream-status: backport
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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Introduce cancel_hv_tscdeadline() to encapsulate preemption
timer cancel stuff.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Change-Id: Icc038176cbf361a9ecdf37ed3425108db57617f2
upstream-status: backport
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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If the TSC deadline timer is programmed really close to the deadline or
even in the past, the computation in vmx_set_hv_timer can underflow and
cause delta_tsc to be set to a huge value. This generally results
in vmx_set_hv_timer returning -ERANGE, but we can fix it by limiting
delta_tsc to be positive or zero.
Reported-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Change-Id: I12eea18c3ec648dbf782d7754b7b574d7d6aa92c
upstream-status: backport
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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Hook the VMX preemption timer to the "hv timer" functionality added
by the previous patch. This includes: checking if the feature is
supported, if the feature is broken on the CPU, the hooks to
setup/clean the VMX preemption timer, arming the timer on vmentry
and handling the vmexit.
A module parameter states if the VMX preemption timer should be
utilized.
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
[Move hv_deadline_tsc to struct vcpu_vmx, use -1 as the "unset" value.
Put all VMX bits here. Enable it by default #yolo. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Change-Id: Icb8e0b853eedce3d52c394e510fa14d2cdd432e9
upstream-status: backport
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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Prepare to switch from preemption timer to hrtimer in the
vmx_pre/post_block. Current functions are only for posted interrupt,
rename them accordingly.
upstream-status: backport
Change-Id: Ie1dde9be21deeb661de095e07d6c29bcba2e7d73
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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The VMX preemption timer can be used to virtualize the TSC deadline timer.
The VMX preemption timer is armed when the vCPU is running, and a VMExit
will happen if the virtual TSC deadline timer expires.
When the vCPU thread is blocked because of HLT, KVM will switch to use
an hrtimer, and then go back to the VMX preemption timer when the vCPU
thread is unblocked.
This solution avoids the complex OS's hrtimer system, and the host
timer interrupt handling cost, replacing them with a little math
(for guest->host TSC and host TSC->preemption timer conversion)
and a cheaper VMexit. This benefits latency for isolated pCPUs.
[A word about performance... Yunhong reported a 30% reduction in average
latency from cyclictest. I made a similar test with tscdeadline_latency
from kvm-unit-tests, and measured
- ~20 clock cycles loss (out of ~3200, so less than 1% but still
statistically significant) in the worst case where the test halts
just after programming the TSC deadline timer
- ~800 clock cycles gain (25% reduction in latency) in the best case
where the test busy waits.
I removed the VMX bits from Yunhong's patch, to concentrate them in the
next patch - Paolo]
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Change-Id: I4aa1ecfa3463d1cbfb317511b45d2074b33d9b6f
upstream-status: backport
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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The function to start the tsc deadline timer virtualization will be used
also by the pre_block hook when we use the preemption timer; change it
to a separate function. No logic changes.
upstream-status: backport
Change-Id: Ie2fc19108c3252f8a299b17aba16c14aa8d31ae8
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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In the Mitaka version of OpenStack, Neutron agent uses connmark
module to add rules into iptable. Enable this module in
opnfv.config to fix the failure of launching instances in Horizon.
Upstream status - NA
Change-Id: I31f346198a5ba50e83d10210bb5b5e10baf825f3
Signed-off-by: davidjchou <david.j.chou@intel.com>
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in bare metal execution of dpdk-16.04.
Upstream: NA.
Change-Id: Ia98461b15348a667c4989dfe1399f0c5bc0f0c12
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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The OPNFV environment requires many kernel modules that are not
part of the default RT kernel environment. This patch adds those
modules back in.
Upstream status: NA
Change-Id: Id4e63f3d2dd3e19614e9e080adf1cdae9ab26ee1
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This config file is based in the previous one, adding the
changes needed in the config file for this new kernel version.
It has been added in kernel support for CephFS.
Upstream: NA.
Change-Id: I1de8b4678bdfa81f4fc204f4a02d11f11cb5ae87
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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The configuration of the kernel enables the framebuffer console without
any framebuffer selected other than i915. Adding the VESA compliant
framebuffer should fix this issue.
Change-Id: Icc384e05774e1de20985aeb19dfef25ae2431bb6
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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Change-Id: Iecc8205f443e2e47fc955c80bf6f0aa55db75447
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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OVS kernel module is important for NFV. The existed kernel config misses
several important kernel configuration, mostly for VxLAN, which is required
by the OVS kernel module.
Also add the OVS as a module, so that user can use it if needed, or replace
it when use the OPNFV patched OVS module.
Change-Id: I032f84e0468fc2614557274a50f30d502d39cc52
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
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Change-Id: I3e91161abafc62554e793e4851df639c099421e7
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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Change-Id: I4c0fe67609fc74fc60e6a2c99d448fd47a6d2a86
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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Change-Id: Icd51e1625a57867b2f79cb2b2d1ab21b23bd80e0
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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Kernel config is important for RT linux. A specific config
file is provided for the opnfv project to build the
reference config options.
Currently this config file is assumed to be used for
both host and guest kernel. We may split them in future.
Change-Id: Ia9ebe0bc002518bb603af8901c6f31531d2f0cee
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
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recently announced rt patch patch-4.1.10-rt10.patch. No further changes
needed.
Change-Id: I9a0cf084498133b10771e744b6da4b29dff706ba
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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These changes brings a vanilla kernel from kernel.org, and the patch
applied for rt is patch-4.1.7-rt8.patch. No further changes needed.
Change-Id: Id8dd03c2ddd971e4d1d69b905f3069737053b700
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
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Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
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Yunhong Jiang
kalyanreddy
Michal Skalski
Jiang, Yunhong
Paolo Bonzini
Wanpeng Li
Wanpeng Li
Yunhong Jiang
davidjchou
José Pekkarinen
Don Dugger
Don Dugger