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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.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
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