* [PATCH] ix86: relax a pvops stub clobber specification
@ 2017-02-03 8:58 Jan Beulich
2017-03-01 9:46 ` [tip:x86/asm] x86/entry/32: Relax " tip-bot for Jan Beulich
0 siblings, 1 reply; 2+ messages in thread
From: Jan Beulich @ 2017-02-03 8:58 UTC (permalink / raw)
To: mingo, tglx, hpa; +Cc: linux-kernel
The code at .Lrestore_nocheck does not make any assumptions on register
values, so all registers can be clobbered on code paths leading there.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
arch/x86/entry/entry_32.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 4.10-rc6/arch/x86/entry/entry_32.S
+++ 4.10-rc6-ix86-relax-clobber/arch/x86/entry/entry_32.S
@@ -585,7 +585,7 @@ ENTRY(iret_exc )
* will soon execute iret and the tracer was already set to
* the irqstate after the IRET:
*/
- DISABLE_INTERRUPTS(CLBR_EAX)
+ DISABLE_INTERRUPTS(CLBR_ANY)
lss (%esp), %esp /* switch to espfix segment */
jmp .Lrestore_nocheck
#endif
^ permalink raw reply [flat|nested] 2+ messages in thread
* [tip:x86/asm] x86/entry/32: Relax a pvops stub clobber specification
2017-02-03 8:58 [PATCH] ix86: relax a pvops stub clobber specification Jan Beulich
@ 2017-03-01 9:46 ` tip-bot for Jan Beulich
0 siblings, 0 replies; 2+ messages in thread
From: tip-bot for Jan Beulich @ 2017-03-01 9:46 UTC (permalink / raw)
To: linux-tip-commits
Cc: dvlasenk, linux-kernel, jbeulich, peterz, brgerst, tglx,
JBeulich, hpa, bp, jpoimboe, torvalds, mingo, luto
Commit-ID: fdbd518adfaf2c10903250dffe70c61ed90b7dd7
Gitweb: http://git.kernel.org/tip/fdbd518adfaf2c10903250dffe70c61ed90b7dd7
Author: Jan Beulich <JBeulich@suse.com>
AuthorDate: Fri, 3 Feb 2017 01:58:03 -0700
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 1 Mar 2017 10:16:30 +0100
x86/entry/32: Relax a pvops stub clobber specification
The code at .Lrestore_nocheck does not make any assumptions on register
values, so all registers can be clobbered on code paths leading there.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/5894542B02000078001366C5@prv-mh.provo.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/entry/entry_32.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 57f7ec3..5553475 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -585,7 +585,7 @@ ENTRY(iret_exc )
* will soon execute iret and the tracer was already set to
* the irqstate after the IRET:
*/
- DISABLE_INTERRUPTS(CLBR_EAX)
+ DISABLE_INTERRUPTS(CLBR_ANY)
lss (%esp), %esp /* switch to espfix segment */
jmp .Lrestore_nocheck
#endif
^ permalink raw reply related [flat|nested] 2+ messages in thread
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