From: Jonathan Daugherty <jtd@galois.com>
To: xen-devel@lists.xenproject.org
Cc: julien.grall@arm.com, sstabellini@kernel.org,
Jonathan Daugherty <jtd@galois.com>
Subject: [PATCH 1/2] arm/traps: fix bug in dump_guest_s1_walk L1 page table offset computation
Date: Wed, 20 Jul 2016 09:10:16 -0700 [thread overview]
Message-ID: <20160720161017.4508-1-jtd@galois.com> (raw)
The dump_guest_s1_walk function was incorrectly using the top 10 bits of
the virtual address to select the L1 page table index. The correct
amount is 12 bits, resulting in a shift of 20 bits rather than 22.
For more details, see the ARMv7-A ARM DDI 0406C.b, section B3.5,
"Short-descriptor translation table format."
Signed-off-by: Jonathan Daugherty <jtd@galois.com>
---
xen/arch/arm/traps.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index a2eb1da..0c10c4d 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2346,7 +2346,7 @@ void dump_guest_s1_walk(struct domain *d, vaddr_t addr)
}
first = map_domain_page(mfn);
- offset = addr >> (12+10);
+ offset = addr >> (12+8);
printk("1ST[0x%"PRIx32"] (0x%"PRIpaddr") = 0x%08"PRIx32"\n",
offset, pfn_to_paddr(mfn_x(mfn)), first[offset]);
if ( !(first[offset] & 0x1) ||
--
2.9.2
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next reply other threads:[~2016-07-20 16:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-20 16:10 Jonathan Daugherty [this message]
2016-07-20 16:10 ` [PATCH 2/2] arm/traps: fix bug in dump_guest_s1_walk handling of level 2 page tables Jonathan Daugherty
-- strict thread matches above, loose matches on Subject: below --
2016-07-19 17:15 [PATCH 1/2] arm/traps: fix bug in dump_guest_s1_walk L1 page table offset computation Jonathan Daugherty
2016-07-20 12:23 ` Julien Grall
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