linux-kernel - Re: [V181,22/54] x86/cpu_entry

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Date:   Fri, 22 Dec 2017 14:05:09 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andrei Vagin <avagin@...tuozzo.com>
cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirsky <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Borislav Petkov <bpetkov@...e.de>,
        Greg KH <gregkh@...uxfoundation.org>, keescook@...gle.com,
        hughd@...gle.com, Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com,
        Will Deacon <will.deacon@....com>,
        Vlastimil Babka <vbabka@...e.cz>, daniel.gruss@...k.tugraz.at,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [V181,22/54] x86/cpu_entry_area: Move it out of fixmap

On Thu, 21 Dec 2017, Andrei Vagin wrote:

> Hi Thomas,
> [    0.000000]   DMA32 zone: 520153 pages, LIFO batch:31
> 
> And then it starts booting again...

Yes. It triple faults. Aside of having made the area one page too small, my
approach of changing this was just naive.

Andrey rescued me and provided the fix below. Thanks again!

Thanks,

	tglx

---
 arch/x86/mm/kasan_init_64.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 6353b8d31e6a..47388f0c0e59 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -323,32 +323,33 @@ void __init kasan_init(void)
 		map_range(&pfn_mapped[i]);
 	}
 
-	kasan_populate_zero_shadow(
-		kasan_mem_to_shadow((void *)PAGE_OFFSET + MAXMEM),
-		kasan_mem_to_shadow((void *)__START_KERNEL_map));
-
-	kasan_populate_shadow((unsigned long)kasan_mem_to_shadow(_stext),
-			      (unsigned long)kasan_mem_to_shadow(_end),
-			      early_pfn_to_nid(__pa(_stext)));
-
 	shadow_cpu_entry_begin = (void *)CPU_ENTRY_AREA_BASE;
 	shadow_cpu_entry_begin = kasan_mem_to_shadow(shadow_cpu_entry_begin);
 	shadow_cpu_entry_begin = (void *)round_down((unsigned long)shadow_cpu_entry_begin,
 						PAGE_SIZE);
 
 	shadow_cpu_entry_end = (void *)(CPU_ENTRY_AREA_BASE +
-					CPU_ENTRY_AREA_TOT_SIZE);
+					CPU_ENTRY_AREA_MAP_SIZE);
 	shadow_cpu_entry_end = kasan_mem_to_shadow(shadow_cpu_entry_end);
 	shadow_cpu_entry_end = (void *)round_up((unsigned long)shadow_cpu_entry_end,
 					PAGE_SIZE);
 
-	kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END),
-				   shadow_cpu_entry_begin);
+	kasan_populate_zero_shadow(
+		kasan_mem_to_shadow((void *)PAGE_OFFSET + MAXMEM),
+		shadow_cpu_entry_begin);
 
 	kasan_populate_shadow((unsigned long)shadow_cpu_entry_begin,
 			      (unsigned long)shadow_cpu_entry_end, 0);
 
-	kasan_populate_zero_shadow(shadow_cpu_entry_end, (void *)KASAN_SHADOW_END);
+	kasan_populate_zero_shadow(shadow_cpu_entry_end,
+				kasan_mem_to_shadow((void *)__START_KERNEL_map));
+
+	kasan_populate_shadow((unsigned long)kasan_mem_to_shadow(_stext),
+			      (unsigned long)kasan_mem_to_shadow(_end),
+			      early_pfn_to_nid(__pa(_stext)));
+
+	kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END),
+				(void *)KASAN_SHADOW_END);
 
 	load_cr3(init_top_pgt);
 	__flush_tlb_all();
-- 
2.13.6