linux-kernel - [PATCH 0/2] x86_64, xen: Simplify Xen SYSCALL handling

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Date:	Sun, 26 Jul 2015 16:29:08 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	X86 ML <x86@...nel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	Andrew Cooper <andrew.cooper3@...rix.com>
Cc:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 0/2] x86_64, xen: Simplify Xen SYSCALL handling

Xen's SYSCALL hooks are overcomplicated and add unnecessary places
where RSP is user controlled.  Simplify it and get rid of those user
RSP code paths under Xen.

Tested as an Intel KVM guest.  Not tested under Xen or on AMD, both
of which are important.

Andy Lutomirski (2):
  x86/entry/64: Rearrange SYSCALL entry points for Xen's benefit
  x86/xen/64: Rearrange the SYSCALL entries

 arch/x86/entry/entry_64.S        | 29 +++++++++++++++--------------
 arch/x86/entry/entry_64_compat.S | 12 +++++++-----
 arch/x86/xen/xen-asm_64.S        | 24 ++++++++++--------------
 3 files changed, 32 insertions(+), 33 deletions(-)

-- 
2.4.3

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