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Peter Zijlstra bf5835bcdb intel_idle: Disable IBRS during long idle 
Having IBRS enabled while the SMT sibling is idle unnecessarily slows
down the running sibling. OTOH, disabling IBRS around idle takes two
MSR writes, which will increase the idle latency.

Therefore, only disable IBRS around deeper idle states. Shallow idle
states are bounded by the tick in duration, since NOHZ is not allowed
for them by virtue of their short target residency.

Only do this for mwait-driven idle, since that keeps interrupts disabled
across idle, which makes disabling IBRS vs IRQ-entry a non-issue.

Note: C6 is a random threshold, most importantly C1 probably shouldn't
disable IBRS, benchmarking needed.

Suggested-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
 		2022-06-27 10:33:59 +02:00
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accessibility
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acpi More power management updates for 5.19-rc1 2022-05-30 11:37:26 -07:00
amba Driver core changes for 5.19-rc1 2022-06-03 11:48:47 -07:00
android fix for breakage in #work.fd this window 2022-06-05 17:14:03 -07:00
ata ata: libata-transport: fix {dma|pio|xfer}_mode sysfs files 2022-06-09 09:25:25 +09:00
atm
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auxdisplay
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base x86/bugs: Report AMD retbleed vulnerability 2022-06-27 10:33:59 +02:00
bcma
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block xen-blkfront: Handle NULL gendisk 2022-06-21 16:36:09 +02:00
bluetooth
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bus ARM: SoC fixes for 5.19 2022-06-26 14:12:56 -07:00
cdrom
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char random: update comment from copy_to_user() -> copy_to_iter() 2022-06-20 11:06:17 +02:00
clk Driver core changes for 5.19-rc1 2022-06-03 11:48:47 -07:00
clocksource clocksource: hyper-v: unexport __init-annotated hv_init_clocksource() 2022-06-08 12:27:08 +00:00
comedi comedi: vmk80xx: fix expression for tx buffer size 2022-06-10 15:21:23 +02:00
connector
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counter
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cpufreq ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
cpuidle
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crypto virtio-crypto: enable retry for virtio-crypto-dev 2022-05-31 12:45:09 -04:00
cxl
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dax
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dca
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devfreq
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dio
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dma dmaengine updates for v5.19-rc1 2022-05-29 11:38:27 -07:00
dma-buf udmabuf: add back sanity check 2022-06-20 08:38:29 -05:00
edac
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eisa
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extcon
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firewire firewire: convert sysfs sprintf/snprintf family to sysfs_emit 2022-06-17 10:43:20 +02:00
firmware ARM: SoC fixes for 5.19 2022-06-26 14:12:56 -07:00
fpga
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fsi
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gnss
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gpio gpio fixes for v5.19-rc4 2022-06-24 17:01:31 -07:00
gpu xen: branch for v5.19-rc4 2022-06-24 12:22:11 -07:00
greybus
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hid HID: hyperv: Correctly access fields declared as __le16 2022-06-08 12:28:13 +00:00
hsi
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hte
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hv Drivers: hv: vmbus: Release cpu lock in error case 2022-06-10 08:41:28 +00:00
hwmon hwmon: (asus-ec-sensors) add missing comma in board name list. 2022-06-15 08:14:38 -07:00
hwspinlock
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hwtracing
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i2c i2c: mediatek: Fix an error handling path in mtk_i2c_probe() 2022-06-14 22:11:54 +02:00
i3c
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idle intel_idle: Disable IBRS during long idle 2022-06-27 10:33:59 +02:00
iio 1st set of IIO fixes for the 5.19 cycle. 2022-06-20 09:49:52 +02:00
infiniband
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input Input updates for v5.19-rc1 2022-06-07 15:00:29 -07:00
interconnect Char / Misc / Other smaller driver subsystem updates for 5.19-rc1 2022-06-03 11:36:34 -07:00
iommu iommu/ipmmu-vmsa: Fix compatible for rcar-gen4 2022-06-22 15:45:56 +02:00
ipack
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irqchip irqchip/loongson-liointc: Use architecture register to get coreid 2022-06-10 08:57:19 +01:00
isdn
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leds ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
macintosh
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mailbox
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mcb
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md dm mirror log: clear log bits up to BITS_PER_LONG boundary 2022-06-23 14:55:43 -04:00
media USB / Thunderbolt changes for 5.19-rc1 2022-06-03 11:17:49 -07:00
memory memory: samsung: exynos5422-dmc: Fix refcount leak in of_get_dram_timings 2022-06-06 11:18:20 +02:00
memstick
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message
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mfd ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
misc Char/Misc driver fixes for 5.19-rc3 - take 2 2022-06-19 09:37:29 -05:00
mmc mmc: mediatek: wait dma stop bit reset to 0 2022-06-15 10:05:56 -07:00
most
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mtd mtd: rawnand: gpmi: Fix setting busy timeout setting 2022-06-16 16:46:08 +02:00
mux
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net virtio_net: fix xdp_rxq_info bug after suspend/resume 2022-06-22 19:09:13 -07:00
nfc nfc: nfcmrvl: Fix memory leak in nfcmrvl_play_deferred 2022-06-08 10:18:10 -07:00
ntb
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nubus
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nvdimm cxl for 5.19 2022-05-27 21:24:19 -07:00
nvme nvme: move the Samsung X5 quirk entry to the core quirks 2022-06-23 15:22:22 +02:00
nvmem
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of
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opp
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parisc
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parport
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pci Driver core changes for 5.19-rc1 2022-06-03 11:48:47 -07:00
pcmcia ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
peci
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perf
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phy
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pinctrl Pin control bulk changes for the v5.19 series: 2022-05-28 11:15:54 -07:00
platform platform-drivers-x86 for v5.19-2 2022-06-12 11:33:42 -07:00
pnp
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power Char / Misc / Other smaller driver subsystem updates for 5.19-rc1 2022-06-03 11:36:34 -07:00
powercap
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pps
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ps3
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ptp
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pwm
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rapidio
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ras
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regulator regulator: qcom_smd: correct MP5496 ranges 2022-06-07 20:38:09 +01:00
remoteproc
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reset
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rpmsg Driver core changes for 5.19-rc1 2022-06-03 11:48:47 -07:00
rtc ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
s390 Driver core changes for 5.19-rc1 2022-06-03 11:48:47 -07:00
sbus
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scsi scsi: ibmvfc: Store vhost pointer during subcrq allocation 2022-06-16 21:42:04 -04:00
sh
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siox
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slimbus Driver core changes for 5.19-rc1 2022-06-03 11:48:47 -07:00
soc This pull request contains Broadcom ARM-based SoCs driver fixes for 2022-06-14 12:20:31 +02:00
soundwire
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spi spi: rockchip: Unmask IRQ at the final to avoid preemption 2022-06-20 11:35:43 +01:00
spmi
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ssb
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staging staging: rtl8723bs: Allocate full pwep structure 2022-06-10 09:10:16 +02:00
target blk-mq: remove the done argument to blk_execute_rq_nowait 2022-05-28 06:15:27 -06:00
tc
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tee Fix a compiler warning in OP-TEE driver 2022-05-30 14:44:27 +02:00
thermal Additional thermal control update for 5.19-rc1 2022-05-30 11:34:13 -07:00
thunderbolt USB / Thunderbolt changes for 5.19-rc1 2022-06-03 11:17:49 -07:00
tty Merge branch 'rework/kthreads' into for-linus 2022-06-23 19:11:28 +02:00
ufs scsi: ufs: Fix a race between the interrupt handler and the reset handler 2022-06-16 21:32:09 -04:00
uio
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usb usb: chipidea: udc: check request status before setting device address 2022-06-24 13:45:23 +02:00
vdpa vduse: Fix NULL pointer dereference on sysfs access 2022-06-08 08:56:03 -04:00
vfio VFIO updates for v5.19-rc1 2022-06-01 13:49:15 -07:00
vhost vdpa: make get_vq_group and set_group_asid optional 2022-06-09 00:26:35 -04:00
video fbdev fixes and updates for kernel v5.19-rc4: 2022-06-26 09:13:51 -07:00
virt Char / Misc / Other smaller driver subsystem updates for 5.19-rc1 2022-06-03 11:36:34 -07:00
virtio virtio,vdpa: fixes 2022-06-11 16:32:47 -07:00
vlynq
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vme
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w1
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watchdog watchdog: gxp: Add missing MODULE_LICENSE 2022-06-09 12:20:34 +02:00
xen xen/gntdev: Avoid blocking in unmap_grant_pages() 2022-06-23 15:29:18 +02:00
zorro
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Kconfig SCSI misc on 20220604 2022-06-05 09:25:12 -07:00
Makefile SCSI misc on 20220604 2022-06-05 09:25:12 -07:00