linux-kernel - [patch V2 18/29] x86/exceptions: Enable IST guard pages

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Date:   Fri, 05 Apr 2019 17:07:16 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Andy Lutomirski <luto@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [patch V2 18/29] x86/exceptions: Enable IST guard pages

All usage sites which expected that the exception stacks in the CPU entry
area are mapped linearly are fixed up. Enable guard pages between the
IST stacks.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/cpu_entry_area.h |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

--- a/arch/x86/include/asm/cpu_entry_area.h
+++ b/arch/x86/include/asm/cpu_entry_area.h
@@ -25,13 +25,9 @@ struct exception_stacks {
 	ESTACKS_MEMBERS(0)
 };
 
-/*
- * The effective cpu entry area mapping with guard pages. Guard size is
- * zero until the code which makes assumptions about linear mapping is
- * cleaned up.
- */
+/* The effective cpu entry area mapping with guard pages. */
 struct cea_exception_stacks {
-	ESTACKS_MEMBERS(0)
+	ESTACKS_MEMBERS(PAGE_SIZE)
 };
 
 /*