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| author | Peter Newman <peternewman@google.com> | 2024-08-22 12:02:11 -0700 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-08-28 11:13:08 +0200 |
| commit | a547a5880cba6f287179135381f1b484b251be31 (patch) | |
| tree | c065e405cf2ba46e5860a5a549c5b9f9616b5279 /include/linux | |
| parent | b6fb565a2d15277896583d471b21bc14a0c99661 (diff) | |
| download | linux-a547a5880cba6f287179135381f1b484b251be31.tar.gz linux-a547a5880cba6f287179135381f1b484b251be31.tar.bz2 linux-a547a5880cba6f287179135381f1b484b251be31.zip | |
x86/resctrl: Fix arch_mbm_* array overrun on SNC
When using resctrl on systems with Sub-NUMA Clustering enabled, monitoring
groups may be allocated RMID values which would overrun the
arch_mbm_{local,total} arrays.
This is due to inconsistencies in whether the SNC-adjusted num_rmid value or
the unadjusted value in resctrl_arch_system_num_rmid_idx() is used. The
num_rmid value for the L3 resource is currently:
resctrl_arch_system_num_rmid_idx() / snc_nodes_per_l3_cache
As a simple fix, make resctrl_arch_system_num_rmid_idx() return the
SNC-adjusted, L3 num_rmid value on x86.
Fixes: e13db55b5a0d ("x86/resctrl: Introduce snc_nodes_per_l3_cache")
Signed-off-by: Peter Newman <peternewman@google.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240822190212.1848788-1-peternewman@google.com
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/resctrl.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h index b0875b99e811..d94abba1c716 100644 --- a/include/linux/resctrl.h +++ b/include/linux/resctrl.h @@ -248,6 +248,7 @@ struct resctrl_schema { /* The number of closid supported by this resource regardless of CDP */ u32 resctrl_arch_get_num_closid(struct rdt_resource *r); +u32 resctrl_arch_system_num_rmid_idx(void); int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid); /* |