[PATCH v4] powerpc/xmon: add read-only mode

[Michael Ellerman]

On Tue, 2019-04-16 at 03:26:38 UTC, "Christopher M. Riedl" wrote:
> Operations which write to memory and special purpose registers should be
> restricted on systems with integrity guarantees (such as Secure Boot)
> and, optionally, to avoid self-destructive behaviors.
> 
> Add a config option, XMON_DEFAULT_RO_MODE, to set default xmon behavior.
> The kernel cmdline options xmon=ro and xmon=rw override this default.
> 
> The following xmon operations are affected:
> memops:
> 	disable memmove
> 	disable memset
> 	disable memzcan
> memex:
> 	no-op'd mwrite
> super_regs:
> 	no-op'd write_spr
> bpt_cmds:
> 	disable
> proc_call:
> 	disable
> 
> Signed-off-by: Christopher M. Riedl <cmr at informatik.wtf>
> Reviewed-by: Oliver O'Halloran <oohall at gmail.com>
> Reviewed-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/0acb5f64560a052fd66ab37b212a7296

cheers