AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch/powerpc
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Gautham R. Shenoy b03897cf31 powerpc/powernv: Fix save/restore of SPRG3 on entry/exit from stop (idle) 
On 64-bit servers, SPRN_SPRG3 and its userspace read-only mirror
SPRN_USPRG3 are used as userspace VDSO write and read registers
respectively.

SPRN_SPRG3 is lost when we enter stop4 and above, and is currently not
restored.  As a result, any read from SPRN_USPRG3 returns zero on an
exit from stop4 (Power9 only) and above.

Thus in this situation, on POWER9, any call from sched_getcpu() always
returns zero, as on powerpc, we call __kernel_getcpu() which relies
upon SPRN_USPRG3 to report the CPU and NUMA node information.

Fix this by restoring SPRN_SPRG3 on wake up from a deep stop state
with the sprg_vdso value that is cached in PACA.

Fixes: e1c1cfed54 ("powerpc/powernv: Save/Restore additional SPRs for stop4 cpuidle")
Cc: stable@vger.kernel.org # v4.14+
Reported-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-07-18 20:40:17 +10:00
..
boot powerpc/boot: Remove core support for Marvell mv64x60 hostbridges 2018-06-04 00:39:23 +10:00
configs powerpc/embedded6xx: Remove C2K board support 2018-06-04 00:39:22 +10:00
crypto crypto: hash - annotate algorithms taking optional key 2018-01-12 23:03:35 +11:00
include KVM: PPC: Check if IOMMU page is contained in the pinned physical page 2018-07-18 16:17:17 +10:00
kernel powerpc/powernv: Fix save/restore of SPRG3 on entry/exit from stop (idle) 2018-07-18 20:40:17 +10:00
kvm KVM: PPC: Check if IOMMU page is contained in the pinned physical page 2018-07-18 16:17:17 +10:00
lib treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
math-emu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mm KVM: PPC: Check if IOMMU page is contained in the pinned physical page 2018-07-18 16:17:17 +10:00
net treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
oprofile treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
perf powerpc/perf: Unregister thread-imc if core-imc not supported 2018-06-03 20:43:37 +10:00
platforms powerpc/powermac: Fix rtc read/write functions 2018-06-27 13:48:49 +10:00
purgatory License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sysdev treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
tools powerpc/kbuild: move -mprofile-kernel check to Kconfig 2018-06-11 09:16:29 +09:00
xmon powerpc/xmon: Fix disassembly since printf changes 2018-07-17 21:18:14 +10:00
Kconfig Kbuild updates for v4.18 (2nd) 2018-06-13 08:40:34 -07:00
Kconfig.debug powerpc: Add new kconfig CONFIG_PPC_IRQ_SOFT_MASK_DEBUG 2018-01-19 22:37:03 +11:00
Makefile powerpc/Makefile: Assemble with -me500 when building for E500 2018-07-18 20:34:42 +10:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00