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Marc Zyngier ada8817ab6 KVM: arm64: Reject VM creation when the default IPA size is unsupported 
commit 7d717558dd upstream.

KVM/arm64 has forever used a 40bit default IPA space, partially
due to its 32bit heritage (where the only choice is 40bit).

However, there are implementations in the wild that have a *cough*
much smaller *cough* IPA space, which leads to a misprogramming of
VTCR_EL2, and a guest that is stuck on its first memory access
if userspace dares to ask for the default IPA setting (which most
VMMs do).

Instead, blundly reject the creation of such VM, as we can't
satisfy the requirements from userspace (with a one-off warning).
Also clarify the boot warning, and document that the VM creation
will fail when an unsupported IPA size is provided.

Although this is an ABI change, it doesn't really change much
for userspace:

- the guest couldn't run before this change, but no error was
  returned. At least userspace knows what is happening.

- a memory slot that was accepted because it did fit the default
  IPA space now doesn't even get a chance to be registered.

The other thing that is left doing is to convince userspace to
actually use the IPA space setting instead of relying on the
antiquated default.

Fixes: 233a7cb235 ("kvm: arm64: Allow tuning the physical address size for VM")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20210311100016.3830038-2-maz@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2021-03-17 17:06:36 +01:00
..
ABI drivers/base/memory: don't store phys_device in memory blocks 2021-03-17 17:06:25 +01:00
accounting doc: cgroup: improve formatting of references 2020-03-02 12:57:03 -07:00
admin-guide drivers/base/memory: don't store phys_device in memory blocks 2021-03-17 17:06:25 +01:00
arm documentation: arm: sunxi: add Allwinner H6 documents 2020-10-28 11:19:24 -06:00
arm64 arm64: Add workaround for Arm Cortex-A77 erratum 1508412 2020-10-29 12:56:01 +00:00
block block-5.10-2020-10-24 2020-10-24 12:46:42 -07:00
bpf bpf: Migrate from patchwork.ozlabs.org to patchwork.kernel.org. 2020-10-11 22:05:47 +02:00
cdrom A handful of obvious fixes that wandered in during the merge window. 2020-08-13 13:57:45 -07:00
core-api dma-mapping: document dma_{alloc,free}_pages 2020-10-23 12:07:46 +02:00
cpu-freq docs: cpu-freq: convert cpufreq-stats.txt to ReST 2020-03-06 00:01:02 +01:00
crypto crypto: af_alg - add extra parameters for DRBG interface 2020-09-25 17:48:52 +10:00
dev-tools linux-kselftest-kunit-fixes-5.10-rc5 2020-11-18 11:57:55 -08:00
devicetree dt-bindings: net: btusb: DT fix s/interrupt-name/interrupt-names/ 2021-03-07 12:34:08 +01:00
doc-guide docs: kerneldoc.py: add support for kerneldoc -nosymbol 2020-10-15 07:49:38 +02:00
driver-api media: vidtv.rst: add kernel-doc markups 2020-11-26 08:05:24 +01:00
fault-injection A handful of late-arriving documentation fixes. 2020-10-23 17:13:53 -07:00
fb drm fixes (round two) for 5.10-rc1 2020-10-23 13:56:34 -07:00
features s390 updates for the 5.10 merge window 2020-10-16 12:36:38 -07:00
filesystems seq_file: document how per-entry resources are managed. 2021-03-04 11:38:37 +01:00
firmware-guide Documentation: ACPI: fix spelling mistakes 2020-11-10 18:48:56 +01:00
firmware_class firmware: revamp firmware documentation 2017-01-11 09:42:59 +01:00
fpga Char/Misc driver patches for 5.9-rc1 2020-08-05 11:43:47 -07:00
gpu drm: Use USB controller's DMA mask when importing dmabufs 2021-03-17 17:06:19 +01:00
hid docs: hid: Convert link to https 2020-07-13 11:26:37 -06:00
hwmon docs: hwmon: mp2975.rst: address some html build warnings 2020-10-28 11:26:10 -06:00
i2c Documentation: i2c: add testunit docs to index 2020-10-05 22:57:45 +02:00
ia64 docs/ia64: Drop obsolete Xen documentation 2020-08-31 16:16:03 -06:00
ide docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
iio Documentation: iio: fix a typo 2020-09-09 11:41:20 -06:00
infiniband RDMA/core: Remove FMR device ops 2020-06-02 20:32:54 -03:00
input Input: uinput - fix typo in function name documentation 2020-07-28 18:24:11 -07:00
isdn isdn: capi: dead code removal 2019-12-11 09:12:38 +01:00
kbuild kbuild: remove unused OBJSIZE 2020-11-02 11:31:00 +09:00
kernel-hacking docs: locking: Drop :c:func: throughout 2020-03-20 17:16:24 -06:00
leds docs: leds: index.rst: add a missing file 2020-11-02 13:45:37 +01:00
litmus-tests Documentation/litmus-tests: Add note on herd7 7.56 in atomic litmus test 2020-06-29 12:05:18 -07:00
livepatch livepatch: Remove .klp.arch 2020-05-08 00:12:42 +02:00
locking Documentation: seqlock: s/LOCKTYPE/LOCKNAME/g 2020-12-30 11:54:11 +01:00
m68k docs: README.buddha: convert to ReST and add to m68k book 2019-07-31 13:30:10 -06:00
maintainer Documentation/maintainer: rehome sign-off process 2020-09-03 15:39:24 -06:00
mhi docs: Add documentation for MHI bus 2020-03-19 07:41:04 +01:00
mips dt: Remove booting-without-of.rst 2020-10-13 13:33:16 -05:00
misc-devices Documentation: remove mic/index from misc-devices/index.rst 2020-11-04 11:38:32 +01:00
netlabel docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
networking docs: networking: drop special stable handling 2021-03-17 17:06:13 +01:00
nios2 docs: nios2: add it to the main Documentation body 2019-07-31 13:31:51 -06:00
nvdimm nvdimm: fixes to maintainter-entry-profile 2020-05-25 10:19:19 -06:00
openrisc docs: openrisc: Replace HTTP links with HTTPS ones 2020-07-13 11:34:09 -06:00
parisc docs: parisc: convert to ReST and add to documentation body 2019-07-31 13:30:15 -06:00
PCI Documentation: better locations for sysfs-pci, sysfs-tagging 2020-10-09 09:33:23 -06:00
pcmcia docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
power PCI/PM: Rename pci_dev.d3_delay to d3hot_delay 2020-09-29 14:21:50 -05:00
powerpc docs updates for v5.10-rc1 2020-10-16 15:02:21 -07:00
process docs: networking: drop special stable handling 2021-03-17 17:06:13 +01:00
RCU Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu 2020-10-09 08:21:56 +02:00
riscv It has been a relatively quiet cycle for documentation, but there's still a 2020-01-29 15:27:31 -08:00
s390 It's been a busy cycle for documentation - hopefully the busiest for a 2020-08-04 22:47:54 -07:00
scheduler docs: scheduler: fix the directory name on two files 2020-09-10 10:45:45 -06:00
scsi scsi: libsas: docs: Remove notify_ha_event() 2021-03-04 11:37:17 +01:00
security watch_queue: Drop references to /dev/watch_queue 2021-03-04 11:37:59 +01:00
sh dt: Remove booting-without-of.rst 2020-10-13 13:33:16 -05:00
sound ALSA: doc: Fix reference to mixart.rst 2021-01-19 18:27:17 +01:00
sparc docs: add arch doc directories to the index 2019-07-15 11:03:01 -03:00
sphinx A small number of fixes, plus a build tweak to respect the desire for 2020-11-03 09:57:30 -08:00
sphinx-static doc-rst: Reduce CSS padding around Field 2019-10-02 10:03:06 -06:00
spi SPI SUBSYSTEM: Replace HTTP links with HTTPS ones 2020-07-09 22:41:11 +01:00
staging remoteproc updates for v5.9 2020-08-11 11:17:45 -07:00
target doc: don't use deprecated "---help---" markers in target docs 2020-06-13 13:32:40 -07:00
timers docs: timers: drop documentation about LB_BIAS 2020-07-23 14:32:44 -06:00
trace docs updates for v5.10-rc1 2020-10-16 15:02:21 -07:00
translations net: switch to the kernel.org patchwork instance 2020-11-11 17:12:00 -08:00
usb USB: Replace HTTP links with HTTPS ones 2020-07-21 13:41:57 +02:00
userspace-api docs: userspace-api: add iommu.rst to the index file 2020-10-28 11:26:10 -06:00
virt KVM: arm64: Reject VM creation when the default IPA size is unsupported 2021-03-17 17:06:36 +01:00
vm A handful of late-arriving documentation fixes. 2020-10-23 17:13:53 -07:00
w1 docs: w1: w1_therm: Fix broken xref, mistakes, clarify text 2020-10-08 09:47:15 +02:00
watchdog watchdog: add support for adjusting last known HW keepalive time 2020-08-05 18:43:02 +02:00
x86 x86/CPU/AMD: Save AMD NodeId as cpu_die_id 2020-12-30 11:54:29 +01:00
xtensa xtensa: fix TLBTEMP area placement 2020-11-16 02:13:15 -08:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
asm-annotations.rst x86/entry: Emit a symbol for register restoring thunk 2021-02-03 23:28:40 +01:00
atomic_bitops.txt docs: atomic_bitops.txt: add a title for this document 2019-04-11 12:37:02 -06:00
atomic_t.txt Documentation/litmus-tests/atomic: Add a test for smp_mb__after_atomic() 2020-06-29 12:05:18 -07:00
Changes docs: add back 'Documentation/Changes' file (as symlink) 2016-12-14 16:30:12 -08:00
CodingStyle doc: re-add CodingStyle and SubmittingPatches 2016-10-24 08:12:35 -02:00
conf.py This pull contains a series of warning fixes from Mauro; once applied, the 2020-11-03 13:14:14 -08:00
COPYING-logo Replace HTTP links with HTTPS ones: documentation 2020-06-08 09:30:19 -06:00
docutils.conf doc-rst: Add missing newline at end of file 2019-06-20 14:16:56 -06:00
dontdiff Documentation: dontdiff: Add zstd compressed files 2020-07-31 11:51:10 +02:00
index.rst docs: index.rst: Add watch_queue 2020-07-23 14:13:23 -06:00
Kconfig docs: Kconfig/Makefile: add a check for broken ABI files 2020-10-30 13:08:07 +01:00
logo.gif Revert "linux.conf.au 2009: Tuz" 2009-04-27 12:00:27 -07:00
Makefile A small number of fixes, plus a build tweak to respect the desire for 2020-11-03 09:57:30 -08:00
memory-barriers.txt docs/memory-barriers.txt: Fix references for DMA*.txt files 2020-08-31 16:14:44 -06:00
SubmittingPatches doc: re-add CodingStyle and SubmittingPatches 2016-10-24 08:12:35 -02:00
watch_queue.rst docs: watch_queue: fix some warnings 2020-09-10 10:48:56 -06:00