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linux-stable/arch/s390/kernel
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Claudio Imbrenda f0a1a0615a KVM: s390: pv: avoid stalls when making pages secure 
Improve make_secure_pte to avoid stalls when the system is heavily
overcommitted. This was especially problematic in kvm_s390_pv_unpack,
because of the loop over all pages that needed unpacking.

Due to the locks being held, it was not possible to simply replace
uv_call with uv_call_sched. A more complex approach was
needed, in which uv_call is replaced with __uv_call, which does not
loop. When the UVC needs to be executed again, -EAGAIN is returned, and
the caller (or its caller) will try again.

When -EAGAIN is returned, the path is the same as when the page is in
writeback (and the writeback check is also performed, which is
harmless).

Fixes: 214d9bbcd3 ("s390/mm: provide memory management functions for protected KVM guests")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Link: https://lore.kernel.org/r/20210920132502.36111-5-imbrenda@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2021-10-25 09:20:39 +02:00
..
syscalls compat: remove some compat entry points 2021-09-08 15:32:35 -07:00
vdso32 s390 updates for 5.15 merge window 2021-08-30 13:07:15 -07:00
vdso64 s390 updates for 5.15 merge window 2021-08-30 13:07:15 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
alternative.c s390/facilities: move stfl information from lowcore to global data 2021-06-07 17:06:58 +02:00
asm-offsets.c s390/smp: enable DAT before CPU restart callback is called 2021-08-26 20:22:12 +02:00
audit.c
audit.h
base.S s390: remove unused s390_base_ext_handler 2020-11-09 11:20:58 +01:00
cache.c
compat_audit.c
compat_linux.c
compat_linux.h
compat_ptrace.h
compat_signal.c s390/signal: switch to using vdso for sigreturn and syscall restart 2021-07-08 22:09:47 +02:00
cpcmd.c s390/cpcmd: use register pair instead of register asm 2021-06-18 16:41:22 +02:00
crash_dump.c s390/dump: introduce boot data 'oldmem_data' 2021-07-27 09:39:16 +02:00
debug.c s390/sclp: add tracing of SCLP interactions 2021-08-25 11:03:35 +02:00
diag.c s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
dis.c s390/disassembler: add instructions 2021-07-27 09:39:19 +02:00
dumpstack.c s390/unwind: add machine check handler stack 2021-04-05 11:30:07 +02:00
early.c s390: make PCI mio support a machine flag 2021-07-27 09:39:19 +02:00
early_printk.c s390/sclp: remove unused sclp_early_printk_forced 2020-09-21 08:08:44 +02:00
ebcdic.c
entry.h s390: remove do_signal() prototype and do_notify_resume() function 2021-08-25 11:03:34 +02:00
entry.S s390/entry: make oklabel within CHKSTG macro local 2021-08-31 14:54:15 +02:00
fpu.c s390: convert to generic entry 2021-01-19 12:29:26 +01:00
ftrace.c s390/ftrace: remove incorrect __va usage 2021-09-08 14:23:31 +02:00
ftrace.h s390/ftrace: implement hotpatching 2021-08-03 14:31:40 +02:00
guarded_storage.c
head64.S s390/boot: move dma sections from decompressor to decompressed kernel 2021-07-27 09:39:17 +02:00
idle.c s390/time,idle: get rid of unsigned long long 2021-03-08 10:46:27 +01:00
ima_arch.c
ipl.c s390/smp: enable DAT before CPU restart callback is called 2021-08-26 20:22:12 +02:00
ipl_vmparm.c s390/cio: remove unused include linux/spinlock.h from cio.h 2021-07-27 09:39:13 +02:00
irq.c s390: replace deprecated CPU-hotplug functions 2021-08-05 14:10:53 +02:00
jump_label.c s390/jump_label: print real address in a case of a jump label bug 2021-07-27 09:39:13 +02:00
kdebugfs.c
kexec_elf.c
kexec_image.c
kprobes.c s390/kprobes: use is_kernel() helper 2021-07-05 12:44:23 +02:00
kprobes_insn_page.S s390/kprobes: move insn_page to text segment 2020-10-09 23:45:30 +02:00
lgr.c s390: convert to msecs_to_jiffies() 2020-06-29 16:31:46 +02:00
machine_kexec.c s390/smp: enable DAT before CPU restart callback is called 2021-08-26 20:22:12 +02:00
machine_kexec_file.c s390/kexec_file: fix initrd location for kdump kernel 2020-05-14 23:21:37 +02:00
machine_kexec_reloc.c s390/kaslr: add support for R_390_JMP_SLOT relocation type 2020-05-20 10:13:27 +02:00
Makefile s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
mcount.S s390/ftrace: fix ftrace_update_ftrace_func implementation 2021-07-15 12:54:58 +02:00
module.c s390/ftrace: implement hotpatching 2021-08-03 14:31:40 +02:00
nmi.c s390/mcck: move register validation to C code 2021-07-05 12:44:23 +02:00
nospec-branch.c s390/speculation: Use statically initialized const for instructions 2021-06-28 11:18:28 +02:00
nospec-sysfs.c s390/facilities: move stfl information from lowcore to global data 2021-06-07 17:06:58 +02:00
numa.c s390/numa: move code to arch/s390/kernel 2020-08-11 18:16:55 +02:00
os_info.c s390/dump: introduce boot data 'oldmem_data' 2021-07-27 09:39:16 +02:00
perf_cpum_cf.c s390/cpum_cf: move array from header to C file 2021-09-07 13:38:41 +02:00
perf_cpum_cf_common.c s390/cpumf: Allow concurrent access for CPU Measurement Counter Facility 2021-07-05 12:44:23 +02:00
perf_cpum_cf_events.c s390/cpum_cf,perf: change DFLT_CCERROR counter name 2020-07-21 13:53:56 +02:00
perf_cpum_sf.c s390/time: convert tod_clock_base to union 2021-02-13 17:17:54 +01:00
perf_event.c s390: Get rid of oprofile leftovers 2021-04-22 13:32:39 +01:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c s390/signal: switch to using vdso for sigreturn and syscall restart 2021-07-08 22:09:47 +02:00
processor.c s390: replace deprecated CPU-hotplug functions 2021-08-05 14:10:53 +02:00
ptrace.c s390/traps: add struct to access transactional diagnostic block 2021-06-07 17:06:58 +02:00
reipl.S
relocate_kernel.S
runtime_instr.c s390/runtime_instrumentation: fix storage key handling 2020-08-17 13:17:10 +02:00
setup.c 2nd batch of s390 updates for 5.15 merge window 2021-09-09 12:55:12 -07:00
signal.c s390: remove do_signal() prototype and do_notify_resume() function 2021-08-25 11:03:34 +02:00
smp.c s390/topology: fix topology information when calling cpu hotplug notifiers 2021-09-07 13:38:41 +02:00
stacktrace.c stacktrace: Move documentation for arch_stack_walk_reliable() to header 2021-03-10 15:52:31 +01:00
sthyi.c s390/sthyi: use register pair instead of register asm 2021-06-18 16:41:22 +02:00
syscall.c s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART 2021-07-08 22:12:17 +02:00
sysinfo.c s390/sysinfo: get rid of register asm 2021-06-18 16:41:23 +02:00
text_amode31.S s390/diag: make restart_part2 a local label 2021-08-25 11:03:34 +02:00
time.c s390/vdso: fix initializing and updating of vdso_data 2021-03-25 21:57:26 +01:00
topology.c s390/topology: fix topology information when calling cpu hotplug notifiers 2021-09-07 13:38:41 +02:00
trace.c s390/ftrace: fix potential crashes when switching tracers 2020-04-22 16:20:55 +02:00
traps.c s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
unwind_bc.c s390/unwind: stop gracefully at user mode pt_regs in irq stack 2019-12-18 23:29:26 +01:00
uprobes.c s390: Fix fall-through warnings for Clang 2021-07-13 14:43:09 -05:00
uv.c KVM: s390: pv: avoid stalls when making pages secure 2021-10-25 09:20:39 +02:00
vdso.c s390/vdso: add minimal compat vdso 2021-07-08 15:37:28 +02:00
vmlinux.lds.S s390: fix typo in linker script 2021-08-25 11:03:34 +02:00
vtime.c s390/vtime: fix increased steal time accounting 2021-03-15 19:09:25 +01:00