Re: [PATCH v3 0/2] Restrict devmem for confidential VMs

[Dave Hansen <dave.hansen@intel.com>]

On 4/17/25 12:11, Dan Williams wrote:
>  arch/x86/Kconfig          |    4 ++++
>  arch/x86/mm/pat/memtype.c |   31 ++++---------------------------
>  drivers/char/mem.c        |   27 +++++++++------------------
>  include/linux/io.h        |   21 +++++++++++++++++++++
>  4 files changed, 38 insertions(+), 45 deletions(-)

This looks like a good idea on multiple levels. We can take it through
tip, but one things that makes me nervous is that neither of the "CHAR
and MISC DRIVERS" supporters are even on cc.

> Arnd Bergmann <arnd@arndb.de> (supporter:CHAR and MISC DRIVERS)
> Greg Kroah-Hartman <gregkh@linuxfoundation.org> (supporter:CHAR and MISC DRIVERS)

I guess arm and powerpc have cc_platform_has() so it's not _completely_
x86 only, either. Acks from those folks would also be appreciated since
it's going to affect them most immediately.

Also, just to confirm, patch 2 can go to stable@ without _any_
dependency on patch 1, right?