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SubjectRe: [PATCH 2/3] x86: Add UV memory protection bios call

* Russ Anderson <rja@sgi.com> wrote:

> Add UV bios call to change memory protections.
>
> Signed-off-by: Russ Anderson <rja@sgi.com>
>
> ---
> arch/x86/kernel/bios_uv.c | 8 ++++++++
> include/asm-x86/uv/bios.h | 10 +++++++++-
> 2 files changed, 17 insertions(+), 1 deletion(-)

> - UV_BIOS_WATCHLIST_FREE
> + UV_BIOS_WATCHLIST_FREE,
> + UV_BIOS_MEMPROTECT

> +enum uv_memprotect {
> + UV_MEMPROT_RESTRICT_ACCESS,
> + UV_MEMPROT_ALLOW_AMO,
> + UV_MEMPROT_ALLOW_RW

hm, what does this do? Does it twiddle the southbridge to protect given
physical RAM rages from the CPU altogether?

Ingo


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