When a user requests a new cache allocation we need to enforce that it does not intersect with an existing pseudo-locked region. An allocation with a bitmask intersection with a pseudo-locked region will enable cache allocations to that region and thus evict pseudo-locked data.
Signed-off-by: Reinette Chatre <reinette.cha...@intel.com> --- arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c index 50d3743ed79e..fb3ecc864b2a 100644 --- a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c +++ b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c @@ -136,8 +136,10 @@ static bool cbm_validate(char *buf, unsigned long *data, struct rdt_resource *r) } /* - * Read one cache bit mask (hex). Check that it is valid for the current - * resource type. + * Read one cache bit mask (hex). Check that it is valid and available for + * the current resource type. While CAT allows CBM to overlap amongst + * classes of service we do not allow a CBM to overlap with a region that has + * been pseudo-locked. */ int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d) { @@ -150,6 +152,8 @@ int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d) if(!cbm_validate(buf, &data, r)) return -EINVAL; + if (cbm_pseudo_locked(data, d)) + return -EINVAL; d->new_ctrl = data; d->have_new_ctrl = true; -- 2.13.5