LKML Archive on lore.kernel.org
 help / color / Atom feed
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>, x86 <x86@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: [tip: x86/entry] x86/idt: Cleanup trap_init()
Date: Sat, 30 May 2020 09:57:16 -0000
Message-ID: <159083263601.17951.6137387139288210222.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20200528145522.992376498@linutronix.de>

The following commit has been merged into the x86/entry branch of tip:

Commit-ID:     88dbb6cfb9be0eaaa95c15a4b6d7f49044a2e1b7
Gitweb:        https://git.kernel.org/tip/88dbb6cfb9be0eaaa95c15a4b6d7f49044a2e1b7
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Thu, 28 May 2020 16:53:19 +02:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 30 May 2020 11:50:12 +02:00

x86/idt: Cleanup trap_init()

No point in having all the IDT cruft in trap_init(). Move it into the IDT
code and fixup the comments.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200528145522.992376498@linutronix.de

---
 arch/x86/kernel/idt.c   | 18 ++++++++++++++++++
 arch/x86/kernel/traps.c |  9 ---------
 2 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index b6e1a87..902cdd0 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -4,6 +4,7 @@
  */
 #include <linux/interrupt.h>
 
+#include <asm/cpu_entry_area.h>
 #include <asm/traps.h>
 #include <asm/proto.h>
 #include <asm/desc.h>
@@ -281,6 +282,19 @@ void __init idt_setup_ist_traps(void)
 }
 #endif
 
+static void __init idt_map_in_cea(void)
+{
+	/*
+	 * Set the IDT descriptor to a fixed read-only location in the cpu
+	 * entry area, so that the "sidt" instruction will not leak the
+	 * location of the kernel, and to defend the IDT against arbitrary
+	 * memory write vulnerabilities.
+	 */
+	cea_set_pte(CPU_ENTRY_AREA_RO_IDT_VADDR, __pa_symbol(idt_table),
+		    PAGE_KERNEL_RO);
+	idt_descr.address = CPU_ENTRY_AREA_RO_IDT;
+}
+
 /**
  * idt_setup_apic_and_irq_gates - Setup APIC/SMP and normal interrupt gates
  */
@@ -307,6 +321,10 @@ void __init idt_setup_apic_and_irq_gates(void)
 		set_intr_gate(i, entry);
 	}
 #endif
+	/* Map IDT into CPU entry area and reload it. */
+	idt_map_in_cea();
+	load_idt(&idt_descr);
+
 	idt_setup_done = true;
 }
 
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 79af913..5566fe5 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -1056,15 +1056,6 @@ void __init trap_init(void)
 	idt_setup_traps();
 
 	/*
-	 * Set the IDT descriptor to a fixed read-only location, so that the
-	 * "sidt" instruction will not leak the location of the kernel, and
-	 * to defend the IDT against arbitrary memory write vulnerabilities.
-	 * It will be reloaded in cpu_init() */
-	cea_set_pte(CPU_ENTRY_AREA_RO_IDT_VADDR, __pa_symbol(idt_table),
-		    PAGE_KERNEL_RO);
-	idt_descr.address = CPU_ENTRY_AREA_RO_IDT;
-
-	/*
 	 * Should be a barrier for any external CPU state:
 	 */
 	cpu_init();

  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-28 14:53 [patch 0/5] x86/idt: Cleanups and consolidation Thomas Gleixner
2020-05-28 14:53 ` [patch 1/5] x86/idt: Mark init only functions __init Thomas Gleixner
2020-05-30  9:57   ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-28 14:53 ` [patch 2/5] x86/idt: Add comments about early #PF handling Thomas Gleixner
2020-05-28 16:14   ` Peter Zijlstra
2020-05-28 18:44     ` Thomas Gleixner
2020-05-30  9:57   ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-28 14:53 ` [patch 3/5] x86/idt: Use proper constants for table sizes Thomas Gleixner
2020-05-30  9:57   ` [tip: x86/entry] x86/idt: Use proper constants for table size tip-bot2 for Thomas Gleixner
2020-05-28 14:53 ` [patch 4/5] x86/idt: Cleanup trap_init() Thomas Gleixner
2020-05-30  9:57   ` tip-bot2 for Thomas Gleixner [this message]
2020-05-28 14:53 ` [patch 5/5] x86/idt: Consolidate idt functionality Thomas Gleixner
2020-05-28 16:16   ` Peter Zijlstra
2020-05-30  9:57   ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-06-01 12:55   ` tip-bot2 for Thomas Gleixner

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=159083263601.17951.6137387139288210222.tip-bot2@tip-bot2 \
    --to=tip-bot2@linutronix.de \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-tip-commits@vger.kernel.org \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git