linux-kernel - Re: [PATCH 00/23] KAISER: unmap most of the kernel from userspace page tables

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Message-ID: <094b0c84-929e-c108-0fc0-19753a18d892@infradead.org>
Date:   Wed, 1 Nov 2017 10:58:40 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, Kees Cook <keescook@...gle.com>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 00/23] KAISER: unmap most of the kernel from userspace
 page tables

On 11/01/2017 10:31 AM, Dave Hansen wrote:

(from attachment)

diff --git a/arch/x86/mm/kaiser.c b/arch/x86/mm/kaiser.c
index 57f7637..cde9014 100644
--- a/arch/x86/mm/kaiser.c
+++ b/arch/x86/mm/kaiser.c
@@ -49,9 +49,21 @@
 static DEFINE_SPINLOCK(shadow_table_allocation_lock);
 
 /*
+ * This is a generic page table walker used only for walking kernel
+ * addresses.  We use it too help recreate the "shadow" page tables

                          to help 

+ * which are used while we are in userspace.
+ *



-- 
~Randy