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Aneesh Kumar K.V bf6b7661f4 powerpc/book3s64/radix: Add kernel command line option to disable radix GTSE 
This adds a kernel command line option that can be used to disable GTSE support.
Disabling GTSE implies kernel will make hcalls to invalidate TLB entries.

This was done so that we can do VM migration between configs that enable/disable
GTSE support via hypervisor. To migrate a VM from a system that supports
GTSE to a system that doesn't, we can boot the guest with
radix_hcall_invalidate=on, thereby forcing the guest to use hcalls for TLB
invalidates.

The check for hcall availability is done in pSeries_setup_arch so that
the panic message appears on the console. This should only happen on
a hypervisor that doesn't force the guest to hash translation even
though it can't handle the radix GTSE=0 request via CAS. With
radix_hcall_invalidate=on if the hypervisor doesn't support hcall_rpt_invalidate
hcall it should force the LPAR to hash translation.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Tested-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200727085908.420806-1-aneesh.kumar@linux.ibm.com
2020-07-29 21:09:37 +10:00
..
ABI powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show cpumask 2020-07-16 13:12:41 +10:00
accounting
admin-guide powerpc/book3s64/radix: Add kernel command line option to disable radix GTSE 2020-07-29 21:09:37 +10:00
arm
arm64 docs/arm64: Fix typo'd #define in sve.rst 2020-06-15 13:17:43 +01:00
block for-5.8-tag 2020-06-02 19:59:25 -07:00
bpf docs/bpf: Add BPF ring buffer design notes 2020-06-01 14:38:22 -07:00
cdrom
core-api powerpc/pseries: remove cede offline state for CPUs 2020-07-16 13:12:34 +10:00
cpu-freq
crypto
dev-tools kcsan: Update Documentation to change supported compilers 2020-06-11 20:04:02 +02:00
devicetree Merge branch 'i2c/for-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-06-13 13:12:38 -07:00
doc-guide A handful of late-arriving docs fixes, along with a patch changing a lot of 2020-06-10 14:12:15 -07:00
driver-api Documentation: media: convert to use i2c_new_client_device() 2020-06-19 09:20:25 +02:00
fault-injection
fb media updates for v5.8-rc1 2020-06-03 20:59:38 -07:00
features powerpc: Select ARCH_HAS_MEMBARRIER_SYNC_CORE 2020-07-23 17:43:23 +10:00
filesystems This is the second round of ext4 commits for 5.8 merge window. It 2020-06-15 09:32:10 -07:00
firmware-guide
firmware_class
fpga
gpu drm/amdgpu: fix documentation around busy_percentage 2020-06-17 17:42:43 -04:00
hid
hwmon Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-06-03 16:27:18 -07:00
i2c Documentation/i2c: SMBus start signal is S not A 2020-06-19 09:21:48 +02:00
ia64 docs: add IRQ documentation at the core-api book 2020-05-15 12:00:56 -06:00
ide
iio
infiniband RDMA/core: Remove FMR device ops 2020-06-02 20:32:54 -03:00
input
isdn
kbuild kbuild: doc: rename LDFLAGS to KBUILD_LDFLAGS 2020-06-06 23:39:20 +09:00
kernel-hacking
leds
livepatch
locking A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
m68k
maintainer Documentation: fixes to the maintainer-entry-profile template 2020-06-01 09:36:07 -06:00
mhi
mips
misc-devices Replace HTTP links with HTTPS ones: documentation 2020-06-08 09:30:19 -06:00
netlabel
networking docs: networkng: convert sja1105's devlink info to RTS 2020-06-10 17:07:04 -07:00
nios2
nvdimm nvdimm: fixes to maintainter-entry-profile 2020-05-25 10:19:19 -06:00
openrisc
parisc
PCI pci-v5.8-changes 2020-06-06 11:01:58 -07:00
pcmcia
power Power management updates for 5.8-rc1 2020-06-02 13:17:23 -07:00
powerpc Merge branch 'scv' support into next 2020-07-23 17:43:44 +10:00
process Merge branch 'rwonce/rework' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux 2020-06-10 14:46:54 -07:00
RCU
riscv
s390 s390 updates for the 5.8 merge window 2020-06-08 12:05:31 -07:00
scheduler
scsi
security Notifications over pipes + Keyring notifications 2020-06-13 09:56:21 -07:00
sh Documentation: remove SH-5 index entries 2020-06-16 17:39:43 -07:00
sound
sparc
sphinx Replace HTTP links with HTTPS ones: documentation 2020-06-08 09:30:19 -06:00
sphinx-static
spi
target doc: don't use deprecated "---help---" markers in target docs 2020-06-13 13:32:40 -07:00
timers
trace A handful of late-arriving docs fixes, along with a patch changing a lot of 2020-06-10 14:12:15 -07:00
translations A handful of late-arriving docs fixes, along with a patch changing a lot of 2020-06-10 14:12:15 -07:00
usb A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
userspace-api Documentation: media: convert to use i2c_new_client_device() 2020-06-19 09:20:25 +02:00
virt KVM: PPC: Book3S HV: Save/restore new PMU registers 2020-07-22 21:56:41 +10:00
vm A handful of late-arriving docs fixes, along with a patch changing a lot of 2020-06-10 14:12:15 -07:00
w1 w1_therm: adding bulk read support to trigger multiple conversion on bus 2020-05-15 16:29:00 +02:00
watchdog watchdog: clarify that stop() is optional 2020-05-25 08:55:42 +02:00
x86 A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
xtensa
.gitignore
asm-annotations.rst
atomic_bitops.txt
atomic_t.txt
bus-virt-phys-mapping.txt
Changes
CodingStyle
conf.py Replace HTTP links with HTTPS ones: documentation 2020-06-08 09:30:19 -06:00
COPYING-logo Replace HTTP links with HTTPS ones: documentation 2020-06-08 09:30:19 -06:00
crc32.txt
docutils.conf
dontdiff modpost: generate vmlinux.symvers and reuse it for the second modpost 2020-06-06 23:38:12 +09:00
index.rst Devicetree updates for v5.8: 2020-06-04 20:11:25 -07:00
Kconfig
kprobes.txt
logo.gif
lzo.txt lib/lzo: fix ambiguous encoding bug in lzo-rle 2020-06-11 18:17:47 -07:00
mailbox.txt
Makefile media updates for v5.8-rc1 2020-06-03 20:59:38 -07:00
memory-barriers.txt libnvdimm/nvdimm/flush: Allow architecture to override the flush barrier 2020-07-16 13:00:22 +10:00
nommu-mmap.txt
remoteproc.txt
rpmsg.txt
speculation.txt
static-keys.txt Replace HTTP links with HTTPS ones: documentation 2020-06-08 09:30:19 -06:00
SubmittingPatches
tee.txt
this_cpu_ops.txt
watch_queue.rst pipe: Add general notification queue support 2020-05-19 15:08:24 +01:00
xz.txt Replace HTTP links with HTTPS ones: documentation 2020-06-08 09:30:19 -06:00