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From: Andi Kleen <andi@firstfloor.org>
To: speck@linutronix.de
Cc: Andi Kleen <ak@linux.intel.com>
Subject: [MODERATED] [PATCH v2 8/8] MDSv2 2
Date: Mon, 10 Dec 2018 09:53:40 -0800	[thread overview]
Message-ID: <7064b44e4325ce4c238666bd9d5eee4f31eaab19.1544464266.git.ak@linux.intel.com> (raw)
In-Reply-To: <cover.1544464266.git.ak@linux.intel.com>
In-Reply-To: <cover.1544464266.git.ak@linux.intel.com>

Clear buffers on kernel exit for MDS mitigation on 32bit kernels.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 arch/x86/entry/entry_32.S | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index d309f30cf7af..de03a0d8426c 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -921,6 +921,8 @@ ENTRY(entry_SYSENTER_32)
 	popl	%edi			/* pt_regs->di */
 	popl	%ebp			/* pt_regs->bp */
 
+	EXIT_MDS
+
 	/* Switch to entry stack */
 	movl	%eax, %esp
 
@@ -1006,10 +1008,12 @@ ENTRY(entry_INT80_32)
 
 restore_all:
 	TRACE_IRQS_IRET
+	EXIT_MDS
 	SWITCH_TO_ENTRY_STACK
 .Lrestore_all_notrace:
 	CHECK_AND_APPLY_ESPFIX
 .Lrestore_nocheck:
+
 	/* Switch back to user CR3 */
 	SWITCH_TO_USER_CR3 scratch_reg=%eax
 
@@ -1028,6 +1032,7 @@ restore_all:
 restore_all_kernel:
 	TRACE_IRQS_IRET
 	PARANOID_EXIT_TO_KERNEL_MODE
+	EXIT_MDS
 	BUG_IF_WRONG_CR3
 	RESTORE_REGS 4
 	jmp	.Lirq_return
-- 
2.17.2

      parent reply	other threads:[~2018-12-10 22:36 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-10 17:53 [MODERATED] [PATCH v2 0/8] MDSv2 8 Andi Kleen
2018-12-10 17:53 ` [MODERATED] [PATCH v2 1/8] MDSv2 4 Andi Kleen
2018-12-11 14:14   ` [MODERATED] " Paolo Bonzini
2018-12-12 21:22   ` Konrad Rzeszutek Wilk
2018-12-12 21:28     ` Andi Kleen
2018-12-12 21:25   ` Konrad Rzeszutek Wilk
2018-12-10 17:53 ` [MODERATED] [PATCH v2 2/8] MDSv2 1 Andi Kleen
2018-12-10 22:49   ` [MODERATED] " Jiri Kosina
2018-12-11  0:03     ` Andi Kleen
2018-12-11  0:13     ` Kanth Ghatraju
2018-12-11  2:00       ` Andi Kleen
2018-12-11  5:36       ` Jiri Kosina
2018-12-11 10:03       ` Borislav Petkov
2018-12-12 21:31         ` Konrad Rzeszutek Wilk
2018-12-12 21:43           ` Andi Kleen
2018-12-12 22:17           ` Borislav Petkov
2018-12-12 22:40             ` Konrad Rzeszutek Wilk
2018-12-12 22:45               ` Borislav Petkov
2018-12-13 15:15                 ` Andrew Cooper
2018-12-13 16:52                   ` Borislav Petkov
2018-12-10 17:53 ` [MODERATED] [PATCH v2 3/8] MDSv2 5 Andi Kleen
2018-12-10 23:00   ` [MODERATED] " Linus Torvalds
2018-12-11  0:03     ` Andi Kleen
2018-12-11  0:43       ` Linus Torvalds
2018-12-11  1:33         ` Linus Torvalds
2018-12-11  2:12           ` Andi Kleen
2018-12-11  2:20           ` Linus Torvalds
2018-12-11  3:25             ` Andi Kleen
2018-12-11 17:55               ` Linus Torvalds
2018-12-11 18:10                 ` Borislav Petkov
2018-12-11 18:21                 ` Linus Torvalds
2018-12-11 18:26                   ` Borislav Petkov
2018-12-11 19:47                   ` Andi Kleen
2018-12-11 21:22                   ` Thomas Gleixner
2018-12-12 14:02               ` [MODERATED] " Paolo Bonzini
2018-12-12 17:58                 ` Andi Kleen
2018-12-12 18:47                   ` Linus Torvalds
2018-12-13 19:44                     ` Linus Torvalds
2018-12-13 20:48                       ` Andi Kleen
2018-12-13 20:56                         ` Linus Torvalds
2018-12-15  0:30                         ` Andi Kleen
2018-12-11  2:10         ` Andi Kleen
2018-12-11  0:09     ` Andrew Cooper
2018-12-10 17:53 ` [MODERATED] [PATCH v2 4/8] MDSv2 0 Andi Kleen
2018-12-12 21:45   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-12-12 22:09     ` Andi Kleen
2018-12-12 22:36       ` Konrad Rzeszutek Wilk
2018-12-10 17:53 ` [MODERATED] [PATCH v2 5/8] MDSv2 7 Andi Kleen
2018-12-11  0:33   ` [MODERATED] " Andrew Cooper
2018-12-12 18:05     ` Andrew Cooper
2018-12-12 21:41   ` Konrad Rzeszutek Wilk
2018-12-12 22:12     ` Andi Kleen
2018-12-10 17:53 ` [MODERATED] [PATCH v2 6/8] MDSv2 3 Andi Kleen
2018-12-11  0:37   ` [MODERATED] " Andrew Cooper
2018-12-11  0:46     ` Luck, Tony
2018-12-11  1:02       ` Andrew Cooper
2018-12-11  1:53       ` Andi Kleen
2018-12-10 17:53 ` [MODERATED] [PATCH v2 7/8] MDSv2 6 Andi Kleen
2018-12-10 17:53 ` Andi Kleen [this message]

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