linux-kernel - [tip:x86/mm2] x86, 64bit, realmode: Use init_level4_pgt to set trampoline

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <tip-9735e91e9c29c0d8fe432aef1152e43e50bdb316@git.kernel.org>
Date:	Tue, 29 Jan 2013 17:27:04 -0800
From:	tip-bot for Yinghai Lu <yinghai@...nel.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	yinghai@...nel.org, jarkko.sakkinen@...el.com, tglx@...utronix.de,
	hpa@...ux.intel.com
Subject: [tip:x86/mm2] x86, 64bit, realmode:
  Use init_level4_pgt to set trampoline_pgd directly

Commit-ID:  9735e91e9c29c0d8fe432aef1152e43e50bdb316
Gitweb:     http://git.kernel.org/tip/9735e91e9c29c0d8fe432aef1152e43e50bdb316
Author:     Yinghai Lu <yinghai@...nel.org>
AuthorDate: Thu, 24 Jan 2013 12:19:50 -0800
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Tue, 29 Jan 2013 15:12:30 -0800

x86, 64bit, realmode: Use init_level4_pgt to set trampoline_pgd directly

with #PF handler way to set early page table, level3_ident will go away with
64bit native path.

So just use entries in init_level4_pgt to set them in trampoline_pgd.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-10-git-send-email-yinghai@kernel.org
Cc: Jarkko Sakkinen <jarkko.sakkinen@...el.com>
Acked-by: Jarkko Sakkinen <jarkko.sakkinen@...el.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/realmode/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index c44ea7c..ffee06a 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -78,8 +78,8 @@ void __init setup_real_mode(void)
 	*trampoline_cr4_features = read_cr4();
 
 	trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd);
-	trampoline_pgd[0] = __pa(level3_ident_pgt) + _KERNPG_TABLE;
-	trampoline_pgd[511] = __pa(level3_kernel_pgt) + _KERNPG_TABLE;
+	trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd;
+	trampoline_pgd[511] = init_level4_pgt[511].pgd;
 #endif
 }
 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/