linux-kernel - [tip: sched/core] intel_idle: Use __update_spec_ctrl() in intel_idle

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Date:   Wed, 04 Oct 2023 15:47:12 -0000
From:   "tip-bot2 for Waiman Long" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Waiman Long <longman@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] intel_idle: Use __update_spec_ctrl() in intel_idle_ibrs()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     1fe96fb4d0f2df207c906a7b1bba70154900ebd1
Gitweb:        https://git.kernel.org/tip/1fe96fb4d0f2df207c906a7b1bba70154900ebd1
Author:        Waiman Long <longman@...hat.com>
AuthorDate:    Thu, 27 Jul 2023 14:45:59 -04:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 04 Oct 2023 13:48:48 +02:00

intel_idle: Use __update_spec_ctrl() in intel_idle_ibrs()

When intel_idle_ibrs() is called, it modifies the SPEC_CTRL MSR to 0
in order disable IBRS. However, the new MSR value isn't reflected in
x86_spec_ctrl_current which is at odd with the other code that keep track
of its state in that percpu variable.  Use the new __update_spec_ctrl()
to have the x86_spec_ctrl_current percpu value properly updated.

Since spec-ctrl.h includes both msr.h and nospec-branch.h, we can remove
those from the include file list.

Signed-off-by: Waiman Long <longman@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: https://lore.kernel.org/r/20230727184600.26768-4-longman@redhat.com
---
 drivers/idle/intel_idle.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index ea5a6a1..86ac9a4 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -53,9 +53,8 @@
 #include <linux/moduleparam.h>
 #include <asm/cpu_device_id.h>
 #include <asm/intel-family.h>
-#include <asm/nospec-branch.h>
 #include <asm/mwait.h>
-#include <asm/msr.h>
+#include <asm/spec-ctrl.h>
 #include <asm/fpu/api.h>
 
 #define INTEL_IDLE_VERSION "0.5.1"
@@ -182,12 +181,12 @@ static __cpuidle int intel_idle_ibrs(struct cpuidle_device *dev,
 	int ret;
 
 	if (smt_active)
-		native_wrmsrl(MSR_IA32_SPEC_CTRL, 0);
+		__update_spec_ctrl(0);
 
 	ret = __intel_idle(dev, drv, index);
 
 	if (smt_active)
-		native_wrmsrl(MSR_IA32_SPEC_CTRL, spec_ctrl);
+		__update_spec_ctrl(spec_ctrl);
 
 	return ret;
 }