[PATCH v2 00/18] vDSO: Introduce generic data storage

From: Thomas Weißschuh
Date: Fri Jan 10 2025 - 10:24:14 EST

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Currently each architecture defines the setup of the vDSO data page on
its own, mostly through copy-and-paste from some other architecture.
Extend the existing generic vDSO implementation to also provide generic
data storage.
This removes duplicated code and paves the way for further changes to
the generic vDSO implementation without having to go through a lot of
per-architecture changes.

Based on v6.13-rc1 and intended to be merged through the tip tree.

This also provides the basis for some generic vDSO reworks.
The commits from this series and the upcoming reworks can be seen at:
https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git/log/?h=vdso/store

---
Changes in v2:
- Drop __arch_get_vdso_u_timens_data() (Christophe)
- Move to lib/vdso/ (Christophe)
- Rename __ppc_get_vdso_u_timens_data() to
__arch_get_vdso_u_timens_data(), same for other hooks
(Christophe)
- Fix build for architectures with time-less vDSO, like riscv32. (Conor)
- Explicitly fix bug around x86 vclock pages
- Link to v1: https://lore.kernel.org/r/20241216-vdso-store-rng-v1-0-f7aed1bdb3b2@xxxxxxxxxxxxx

---
Thomas Weißschuh (18):
x86/vdso: Fix latent bug in vclock_pages calculation
parisc: Remove unused symbol vdso_data
vdso: Introduce vdso/align.h
vdso: Rename included Makefile
vdso: Add generic time data storage
vdso: Add generic random data storage
vdso: Add generic architecture-specific data storage
arm64: vdso: Switch to generic storage implementation
riscv: vdso: Switch to generic storage implementation
LoongArch: vDSO: Switch to generic storage implementation
arm: vdso: Switch to generic storage implementation
s390/vdso: Switch to generic storage implementation
MIPS: vdso: Switch to generic storage implementation
powerpc/vdso: Switch to generic storage implementation
x86/vdso: Switch to generic storage implementation
x86/vdso/vdso2c: Remove page handling
vdso: Remove remnants of architecture-specific random state storage
vdso: Remove remnants of architecture-specific time storage

arch/Kconfig | 4 +
arch/arm/include/asm/vdso.h | 2 +
arch/arm/include/asm/vdso/gettimeofday.h | 7 +-
arch/arm/include/asm/vdso/vsyscall.h | 12 +-
arch/arm/kernel/asm-offsets.c | 4 -
arch/arm/kernel/vdso.c | 34 ++----
arch/arm/mm/Kconfig | 1 +
arch/arm/vdso/Makefile | 2 +-
arch/arm/vdso/vdso.lds.S | 4 +-
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/vdso.h | 2 +-
arch/arm64/include/asm/vdso/compat_gettimeofday.h | 36 ++----
arch/arm64/include/asm/vdso/getrandom.h | 12 --
arch/arm64/include/asm/vdso/gettimeofday.h | 16 +--
arch/arm64/include/asm/vdso/vsyscall.h | 25 +---
arch/arm64/kernel/vdso.c | 90 +-------------
arch/arm64/kernel/vdso/Makefile | 2 +-
arch/arm64/kernel/vdso/vdso.lds.S | 7 +-
arch/arm64/kernel/vdso32/Makefile | 2 +-
arch/arm64/kernel/vdso32/vdso.lds.S | 7 +-
arch/csky/kernel/vdso/Makefile | 2 +-
arch/loongarch/Kconfig | 2 +
arch/loongarch/include/asm/vdso.h | 1 -
arch/loongarch/include/asm/vdso/arch_data.h | 25 ++++
arch/loongarch/include/asm/vdso/getrandom.h | 5 -
arch/loongarch/include/asm/vdso/gettimeofday.h | 14 +--
arch/loongarch/include/asm/vdso/vdso.h | 38 +-----
arch/loongarch/include/asm/vdso/vsyscall.h | 17 ---
arch/loongarch/kernel/asm-offsets.c | 2 +-
arch/loongarch/kernel/vdso.c | 92 +--------------
arch/loongarch/vdso/Makefile | 2 +-
arch/loongarch/vdso/vdso.lds.S | 8 +-
arch/loongarch/vdso/vgetcpu.c | 12 +-
arch/mips/Kconfig | 1 +
arch/mips/include/asm/vdso/gettimeofday.h | 9 +-
arch/mips/include/asm/vdso/vdso.h | 19 ++-
arch/mips/include/asm/vdso/vsyscall.h | 14 +--
arch/mips/kernel/vdso.c | 47 +++-----
arch/mips/vdso/Makefile | 2 +-
arch/mips/vdso/vdso.lds.S | 5 +-
arch/parisc/include/asm/vdso.h | 2 -
arch/parisc/kernel/vdso32/Makefile | 2 +-
arch/parisc/kernel/vdso64/Makefile | 2 +-
arch/powerpc/Kconfig | 2 +
arch/powerpc/include/asm/vdso.h | 1 +
arch/powerpc/include/asm/vdso/arch_data.h | 37 ++++++
arch/powerpc/include/asm/vdso/getrandom.h | 11 +-
arch/powerpc/include/asm/vdso/gettimeofday.h | 29 ++---
arch/powerpc/include/asm/vdso/vsyscall.h | 13 ---
arch/powerpc/include/asm/vdso_datapage.h | 44 +------
arch/powerpc/kernel/asm-offsets.c | 1 -
arch/powerpc/kernel/time.c | 2 +-
arch/powerpc/kernel/vdso.c | 115 ++----------------
arch/powerpc/kernel/vdso/Makefile | 2 +-
arch/powerpc/kernel/vdso/cacheflush.S | 2 +-
arch/powerpc/kernel/vdso/datapage.S | 4 +-
arch/powerpc/kernel/vdso/gettimeofday.S | 4 +-
arch/powerpc/kernel/vdso/vdso32.lds.S | 4 +-
arch/powerpc/kernel/vdso/vdso64.lds.S | 4 +-
arch/powerpc/kernel/vdso/vgettimeofday.c | 14 +--
arch/riscv/Kconfig | 3 +-
arch/riscv/include/asm/vdso.h | 2 +-
.../include/asm/vdso/{time_data.h => arch_data.h} | 8 +-
arch/riscv/include/asm/vdso/gettimeofday.h | 14 +--
arch/riscv/include/asm/vdso/vsyscall.h | 9 --
arch/riscv/kernel/sys_hwprobe.c | 3 +-
arch/riscv/kernel/vdso.c | 90 +-------------
arch/riscv/kernel/vdso/Makefile | 2 +-
arch/riscv/kernel/vdso/hwprobe.c | 6 +-
arch/riscv/kernel/vdso/vdso.lds.S | 7 +-
arch/s390/Kconfig | 1 +
arch/s390/include/asm/vdso.h | 4 +-
arch/s390/include/asm/vdso/getrandom.h | 12 --
arch/s390/include/asm/vdso/gettimeofday.h | 15 +--
arch/s390/include/asm/vdso/vsyscall.h | 20 ----
arch/s390/kernel/time.c | 6 +-
arch/s390/kernel/vdso.c | 97 +---------------
arch/s390/kernel/vdso32/Makefile | 2 +-
arch/s390/kernel/vdso32/vdso32.lds.S | 7 +-
arch/s390/kernel/vdso64/Makefile | 2 +-
arch/s390/kernel/vdso64/vdso64.lds.S | 8 +-
arch/x86/Kconfig | 1 +
arch/x86/entry/vdso/Makefile | 2 +-
arch/x86/entry/vdso/vdso-layout.lds.S | 10 +-
arch/x86/entry/vdso/vdso2c.c | 21 ----
arch/x86/entry/vdso/vdso2c.h | 20 ----
arch/x86/entry/vdso/vma.c | 125 ++------------------
arch/x86/include/asm/vdso.h | 6 -
arch/x86/include/asm/vdso/getrandom.h | 10 --
arch/x86/include/asm/vdso/gettimeofday.h | 25 +---
arch/x86/include/asm/vdso/vsyscall.h | 23 +---
drivers/char/random.c | 6 +-
include/asm-generic/vdso/vsyscall.h | 23 ++--
include/linux/align.h | 10 +-
include/linux/time_namespace.h | 2 -
include/linux/vdso_datastore.h | 10 ++
include/vdso/align.h | 15 +++
include/vdso/datapage.h | 75 +++++++++---
include/vdso/helpers.h | 8 +-
kernel/time/namespace.c | 12 +-
kernel/time/vsyscall.c | 19 ++-
lib/Makefile | 2 +-
lib/vdso/Kconfig | 5 +
lib/vdso/Makefile | 19 +--
lib/vdso/Makefile.include | 18 +++
lib/vdso/datastore.c | 129 +++++++++++++++++++++
lib/vdso/getrandom.c | 8 +-
lib/vdso/gettimeofday.c | 74 +++++++-----
108 files changed, 602 insertions(+), 1276 deletions(-)
---
base-commit: 40384c840ea1944d7c5a392e8975ed088ecf0b37
change-id: 20240911-vdso-store-rng-607a3dc9e050

Best regards,
--
Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>

Next message: Thomas Weißschuh: "[PATCH v2 01/18] x86/vdso: Fix latent bug in vclock_pages calculation"
Previous message: Krzysztof Kozlowski: "Re: [PATCH 10/19] powerpc: dts: Add MPC8314E devicetree"
Next in thread: Thomas Weißschuh: "[PATCH v2 01/18] x86/vdso: Fix latent bug in vclock_pages calculation"
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