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Marc Zyngier 46dc542870 arm: cpu: Add optional CMOs by VA 
Exposing set/way cache maintenance to a virtual machine is unsafe, not
least because the instructions are not permission-checked but also
because they are not broadcast between CPUs. Consequently, KVM traps and
emulates such maintenance in the host kernel using by-VA operations and
looping over the stage-2 page-tables. However, when running under
protected KVM, these instructions are not able to be emulated and will
instead result in an exception being delivered to the guest.

Introduce CONFIG_CMO_BY_VA_ONLY so that virtual platforms can select
this option and perform by-VA cache maintenance instead of using the
set/way instructions.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <willdeacon@google.com>
Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
[ Paul: pick from the Android tree. Fixup Pierre's commit. And fix some
  checkpatch warnings. Rebased to upstream. ]
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Tom Rini <trini@konsulko.com>
Link: db5507f47f
Link: 2baf54e743
2023-03-06 17:03:55 -05:00
..
arc dm: dts: Convert driver model tags to use new schema 2023-02-14 09:43:26 -07:00
arm arm: cpu: Add optional CMOs by VA 2023-03-06 17:03:55 -05:00
m68k dm: dts: Convert driver model tags to use new schema 2023-02-14 09:43:26 -07:00
microblaze Correct SPL uses of LMB 2023-02-10 07:41:39 -05:00
mips dm: dts: Convert driver model tags to use new schema 2023-02-14 09:43:26 -07:00
nios2 dm: dts: Convert driver model tags to use new schema 2023-02-14 09:43:26 -07:00
powerpc dm: dts: Convert driver model tags to use new schema 2023-02-14 09:43:26 -07:00
riscv Prepare v2023.04-rc3 2023-02-27 17:28:21 -05:00
sandbox sandbox: Use the generic VPL option to enable VPL 2023-03-02 17:45:58 -05:00
sh dm: dts: Convert driver model tags to use new schema 2023-02-14 09:43:26 -07:00
x86 Prepare v2023.04-rc3 2023-02-27 17:28:21 -05:00
xtensa global: Migrate CONFIG_MAX_MEM_MAPPED to CFG 2022-12-23 10:14:51 -05:00
.gitignore
Kconfig event: Correct dependencies on the EVENT framework 2023-01-18 12:46:13 -05:00
Kconfig.nxp nxp: Finish migration of SYS_FSL_SRDS_[12] to Kconfig 2023-01-20 12:27:23 -05:00
u-boot-elf.lds