From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>, "H Peter Anvin" <hpa@zytor.com>,
"Tony Luck" <tony.luck@intel.com>
Cc: "Chatre, Reinette" <reinette.chatre@intel.com>,
"Xiaochen Shen" <xiaochen.shen@intel.com>,
"Chen Yu" <yu.c.chen@intel.com>,
"linux-kernel" <linux-kernel@vger.kernel.org>,
"x86" <x86@kernel.org>, "Fenghua Yu" <fenghua.yu@intel.com>
Subject: [PATCH V2 5/9] x86/intel_rdt: Fix unchecked MSR access
Date: Sat, 15 Sep 2018 14:58:23 -0700 [thread overview]
Message-ID: <1537048707-76280-6-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1537048707-76280-1-git-send-email-fenghua.yu@intel.com>
From: Reinette Chatre <reinette.chatre@intel.com>
When a new resource group is created, it is initialized with sane
defaults that currently assume the resource being initialized is a CAT
resource. This code path is also followed by a MBA resource that is not
allocated the same as a CAT resource and as a result we encounter the
following unchecked MSR access error:
unchecked MSR access error: WRMSR to 0xd51 (tried to write 0x0000
000000000064) at rIP: 0xffffffffae059994 (native_write_msr+0x4/0x20)
Call Trace:
mba_wrmsr+0x41/0x80
update_domains+0x125/0x130
rdtgroup_mkdir+0x270/0x500
Fix the above by ensuring the initial allocation is only attempted on a
CAT resource.
Fixes: 95f0b77ef ("x86/intel_rdt: Initialize new resource group with sane defaults")
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index ea91750ba27f..74821bc457c0 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -2349,6 +2349,12 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
u32 *ctrl;
for_each_alloc_enabled_rdt_resource(r) {
+ /*
+ * Only initialize default allocations for CBM cache
+ * resources
+ */
+ if (r->rid == RDT_RESOURCE_MBA)
+ continue;
list_for_each_entry(d, &r->domains, list) {
d->have_new_ctrl = false;
d->new_ctrl = r->cache.shareable_bits;
@@ -2386,6 +2392,12 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
}
for_each_alloc_enabled_rdt_resource(r) {
+ /*
+ * Only initialize default allocations for CBM cache
+ * resources
+ */
+ if (r->rid == RDT_RESOURCE_MBA)
+ continue;
ret = update_domains(r, rdtgrp->closid);
if (ret < 0) {
rdt_last_cmd_puts("failed to initialize allocations\n");
--
2.19.0
next prev parent reply other threads:[~2018-09-15 22:01 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-15 21:58 [PATCH V2 0/9] x86/intel_rdt: MBA integration fixes Fenghua Yu
2018-09-15 21:58 ` [PATCH V2 1/9] x86/intel_rdt: Fix data type in parsing callbacks Fenghua Yu
2018-09-18 21:42 ` [tip:x86/urgent] " tip-bot for Xiaochen Shen
2018-09-15 21:58 ` [PATCH V2 2/9] x86/intel_rdt: Fix size reporting of MBA resource Fenghua Yu
2018-09-18 21:43 ` [tip:x86/urgent] " tip-bot for Reinette Chatre
2018-09-15 21:58 ` [PATCH V2 3/9] x86/intel_rdt: Global closid helper to support future fixes Fenghua Yu
2018-09-18 21:43 ` [tip:x86/urgent] " tip-bot for Reinette Chatre
2018-09-15 21:58 ` [PATCH V2 4/9] x86/intel_rdt: Fix invalid mode warning when multiple resources are managed Fenghua Yu
2018-09-18 21:44 ` [tip:x86/urgent] " tip-bot for Reinette Chatre
2018-09-15 21:58 ` Fenghua Yu [this message]
2018-09-18 21:45 ` [tip:x86/urgent] x86/intel_rdt: Fix unchecked MSR access tip-bot for Reinette Chatre
2018-09-15 21:58 ` [PATCH V2 6/9] x86/intel_rdt: Do not allow pseudo-locking of MBA resource Fenghua Yu
2018-09-18 21:45 ` [tip:x86/urgent] " tip-bot for Reinette Chatre
2018-09-15 21:58 ` [PATCH V2 7/9] x86/intel_rdt: Fix incorrect loop end condition Fenghua Yu
2018-09-18 21:46 ` [tip:x86/urgent] " tip-bot for Reinette Chatre
2018-09-15 21:58 ` [PATCH V2 8/9] x86/intel_rdt: Fix exclusive mode handling of MBA resource Fenghua Yu
2018-09-18 21:46 ` [tip:x86/urgent] " tip-bot for Reinette Chatre
2018-09-15 21:58 ` [PATCH V2 9/9] x86/intel_rdt: Fix incorrect loop end condition Fenghua Yu
2018-09-18 21:47 ` [tip:x86/urgent] " tip-bot for Reinette Chatre
-- strict thread matches above, loose matches on Subject: below --
2018-09-04 17:46 [PATCH][RFC] x86/intel_rdt: Do not display size for non-CAT resource Chen Yu
2018-09-04 20:24 ` Reinette Chatre
2018-09-04 22:36 ` Reinette Chatre
2018-09-05 6:28 ` Yu Chen
2018-09-05 20:52 ` Reinette Chatre
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