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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
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