David Woodhouse a66fe0437d Revert "x86/retpoline: Simplify vmexit_fill_RSB()" ...

commit d1c99108af upstream.

This reverts commit 1dde7415e9. By putting
the RSB filling out of line and calling it, we waste one RSB slot for
returning from the function itself, which means one fewer actual function
call we can make if we're doing the Skylake abomination of call-depth
counting.

It also changed the number of RSB stuffings we do on vmexit from 32,
which was correct, to 16. Let's just stop with the bikeshedding; it
didn't actually *fix* anything anyway.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: arjan.van.de.ven@intel.com
Cc: bp@alien8.de
Cc: dave.hansen@intel.com
Cc: jmattson@google.com
Cc: karahmed@amazon.de
Cc: kvm@vger.kernel.org
Cc: pbonzini@redhat.com
Cc: rkrcmar@redhat.com
Link: http://lkml.kernel.org/r/1519037457-7643-4-git-send-email-dwmw@amazon.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-03-15 10:54:36 +01:00

..

syscalls

x86/build: Beautify build log of syscall headers

2017-12-25 14:26:16 +01:00

vdso

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

vsyscall

x86/pti: Map the vsyscall page if needed

2018-01-02 20:31:00 +01:00

calling.h

x86/entry/64: Use 'xorl' for faster register clearing

2018-03-15 10:54:36 +01:00

common.c

x86/syscall: Sanitize syscall table de-references under speculation

2018-02-07 11:12:23 -08:00

entry_32.S

Revert "x86/retpoline: Simplify vmexit_fill_RSB()"

2018-03-15 10:54:36 +01:00

entry_64_compat.S

x86/entry/64: Use 'xorl' for faster register clearing

2018-03-15 10:54:36 +01:00

entry_64.S

Revert "x86/retpoline: Simplify vmexit_fill_RSB()"

2018-03-15 10:54:36 +01:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

syscall_32.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

syscall_64.c

x86/entry/64: Remove the SYSCALL64 fast path

2018-02-07 11:12:22 -08:00

thunk_32.S

x86: move exports to actual definitions

2016-08-07 23:47:15 -04:00

thunk_64.S

x86: move exports to actual definitions

2016-08-07 23:47:15 -04:00