[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1537048707-76280-7-git-send-email-fenghua.yu@intel.com>
Date: Sat, 15 Sep 2018 14:58:24 -0700
From: Fenghua Yu <fenghua.yu@...el.com>
To: "Thomas Gleixner" <tglx@...utronix.de>,
"Ingo Molnar" <mingo@...hat.com>, "H Peter Anvin" <hpa@...or.com>,
"Tony Luck" <tony.luck@...el.com>
Cc: "Chatre, Reinette" <reinette.chatre@...el.com>,
"Xiaochen Shen" <xiaochen.shen@...el.com>,
"Chen Yu" <yu.c.chen@...el.com>,
"linux-kernel" <linux-kernel@...r.kernel.org>,
"x86" <x86@...nel.org>, "Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH V2 6/9] x86/intel_rdt: Do not allow pseudo-locking of MBA resource
From: Reinette Chatre <reinette.chatre@...el.com>
A system supporting pseudo-locking may have MBA as well as CAT
resources of which only the CAT resources could support cache
pseudo-locking. When the schemata to be pseudo-locked is provided it
should be checked that that schemata does not attempt to pseudo-lock a
MBA resource.
Fixes: e0bdfe8e3 ("x86/intel_rdt: Support creation/removal of pseudo-locked region")
Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
index edd5761f7336..0f53049719cd 100644
--- a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
@@ -195,6 +195,12 @@ static int parse_line(char *line, struct rdt_resource *r,
struct rdt_domain *d;
unsigned long dom_id;
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+ r->rid == RDT_RESOURCE_MBA) {
+ rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
+ return -EINVAL;
+ }
+
next:
if (!line || line[0] == '\0')
return 0;
--
2.19.0
Powered by blists - more mailing lists