mbox series

[v2,0/3] riscv: Per-thread envcfg CSR support

Message ID 20240613171447.3176616-1-samuel.holland@sifive.com (mailing list archive)
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Series riscv: Per-thread envcfg CSR support | expand

Message

Samuel Holland June 13, 2024, 5:14 p.m. UTC 
This series (or equivalent) is a prerequisite for both user-mode pointer
masking and CFI support, as those are per-thread features are controlled
by fields in the envcfg CSR. These patches are based on v1 of the
pointer masking series[1], with significant input from both Deepak and
Andrew. By sending this as a separate series, hopefully we can converge
on a single implementation of this functionality.

[1]: https://lore.kernel.org/linux-riscv/20240319215915.832127-6-samuel.holland@sifive.com/

Changes in v2:
 - Rebase on riscv/linux.git for-next

Samuel Holland (3):
  riscv: Enable cbo.zero only when all harts support Zicboz
  riscv: Add support for per-thread envcfg CSR values
  riscv: Call riscv_user_isa_enable() only on the boot hart

 arch/riscv/include/asm/cpufeature.h |  2 +-
 arch/riscv/include/asm/processor.h  |  1 +
 arch/riscv/include/asm/switch_to.h  |  8 ++++++++
 arch/riscv/kernel/cpufeature.c      | 13 +++++++++----
 arch/riscv/kernel/smpboot.c         |  2 --
 arch/riscv/kernel/suspend.c         |  4 ++--
 6 files changed, 21 insertions(+), 9 deletions(-)

Comments

Andrew Jones June 21, 2024, 12:54 p.m. UTC | #1 
On Thu, Jun 13, 2024 at 10:14:38AM GMT, Samuel Holland wrote:
> This series (or equivalent) is a prerequisite for both user-mode pointer
> masking and CFI support, as those are per-thread features are controlled
> by fields in the envcfg CSR. These patches are based on v1 of the
> pointer masking series[1], with significant input from both Deepak and
> Andrew. By sending this as a separate series, hopefully we can converge
> on a single implementation of this functionality.
> 
> [1]: https://lore.kernel.org/linux-riscv/20240319215915.832127-6-samuel.holland@sifive.com/
> 
> Changes in v2:
>  - Rebase on riscv/linux.git for-next
> 
> Samuel Holland (3):
>   riscv: Enable cbo.zero only when all harts support Zicboz
>   riscv: Add support for per-thread envcfg CSR values
>   riscv: Call riscv_user_isa_enable() only on the boot hart
>

For the series,

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>

Thanks,
drew