RE: [PATCH v2 0/7] x86/resctrl : Support L3 Smart Data Cache Injection Allocation Enforcement (SDCIAE)

["Luck, Tony" <tony.luck@xxxxxxxxx>]

I don't have an AMD system, so I added a couple of hacks to the code to pretend I did.
My hacks might have missed something, so the below test may not fail for you.

My test:

# echo 1 > info/L3/io_alloc
# cat info/L3/bit_usage

This gave me a console splat starting with:

[  163.801078] invalid mode for closid 14

That happened because in rdt_bit_usage_show()

                for (i = 0; i < closids_supported(); i++) {
                        if (!closid_allocated(i))
                                continue;
                        ctrl_val = resctrl_arch_get_config(r, dom, i,
                                                           s->conf_type);
                        mode = rdtgroup_mode_by_closid(i);

CLOSID 14 is my highest. It's supported, and allocated.

rdtgroup_mode_by_closid() searches rdt_all_groups to find
one using CLOSID 14, but there isn't one. So it returns
RDT_NUM_MODES

Maybe RDT_NUM_MODES isn't invalid in the switch()
Looks like it should be same action as RDT_MODE_SHAREABLE?

-Tony