From: Denys Vlasenko <dvlasenk@redhat.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>, Oleg Nesterov <oleg@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Alexei Starovoitov <ast@plumgrid.com>,
Will Drewry <wad@chromium.org>, Kees Cook <keescook@chromium.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 0/4 v2] x86: entry_64.S: steps towards simpler iret frame handling
Date: Mon, 9 Mar 2015 19:39:20 +0100 [thread overview]
Message-ID: <1425926364-9526-1-git-send-email-dvlasenk@redhat.com> (raw)
These changes make SYSENTER64 code path save flags and user's
stack pointer in pt_regs->flags and pt_regs->sp, where they belong.
As a result, we can drop stub_iopl() and thread_struct::usersp.
Usage of PER_CPU(old_rsp) is reduced to bare minimum.
FIXUP/RESTORE_TOP_OF_STACK macros are on diet too.
Changes since v1: on Ingo's request, split into 4 patches intead of 2.
CC: Linus Torvalds <torvalds@linux-foundation.org>
CC: Steven Rostedt <rostedt@goodmis.org>
CC: Ingo Molnar <mingo@kernel.org>
CC: Borislav Petkov <bp@alien8.de>
CC: "H. Peter Anvin" <hpa@zytor.com>
CC: Andy Lutomirski <luto@amacapital.net>
CC: Oleg Nesterov <oleg@redhat.com>
CC: Frederic Weisbecker <fweisbec@gmail.com>
CC: Alexei Starovoitov <ast@plumgrid.com>
CC: Will Drewry <wad@chromium.org>
CC: Kees Cook <keescook@chromium.org>
CC: x86@kernel.org
CC: linux-kernel@vger.kernel.org
Denys Vlasenko (4):
x86: save r11 into pt_regs->flags on SYSCALL64 fastpath
Remove stub_iopl
x86: save user %rsp in pt_regs->sp on SYSCALL64 fastpath
Remove unused stuff
arch/x86/include/asm/calling.h | 20 +++++++++-----
arch/x86/include/asm/compat.h | 2 +-
arch/x86/include/asm/processor.h | 6 -----
arch/x86/include/asm/ptrace.h | 8 ++----
arch/x86/kernel/entry_64.S | 57 ++++++++++++++--------------------------
arch/x86/kernel/perf_regs.c | 2 +-
arch/x86/kernel/process_64.c | 8 +-----
arch/x86/syscalls/syscall_64.tbl | 2 +-
arch/x86/um/sys_call_table_64.c | 2 +-
9 files changed, 40 insertions(+), 67 deletions(-)
--
1.8.1.4
next reply other threads:[~2015-03-09 18:40 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-09 18:39 Denys Vlasenko [this message]
2015-03-09 18:39 ` [PATCH 1/4] x86: save r11 into pt_regs->flags on SYSCALL64 fastpath Denys Vlasenko
2015-03-09 20:02 ` Andy Lutomirski
2015-03-16 12:04 ` [tip:x86/asm] x86/asm/entry/64: Save R11 into pt_regs-> flags " tip-bot for Denys Vlasenko
2015-03-09 18:39 ` [PATCH 3/4] x86: save user rsp in pt_regs->sp " Denys Vlasenko
2015-03-09 20:11 ` Andy Lutomirski
2015-03-09 20:32 ` Denys Vlasenko
2015-03-09 20:43 ` Andy Lutomirski
2015-03-10 12:51 ` Ingo Molnar
2015-03-10 13:10 ` Andy Lutomirski
2015-03-10 13:18 ` Denys Vlasenko
2015-03-10 13:20 ` Andy Lutomirski
2015-03-10 13:26 ` Ingo Molnar
2015-03-10 13:21 ` Ingo Molnar
2015-03-10 13:26 ` Andy Lutomirski
2015-03-10 14:00 ` Denys Vlasenko
2015-03-10 14:02 ` Andy Lutomirski
2015-03-10 14:09 ` Denys Vlasenko
2015-03-10 13:28 ` Ingo Molnar
2015-03-10 13:50 ` Denys Vlasenko
2015-03-16 9:44 ` Ingo Molnar
2015-03-16 12:05 ` [tip:x86/asm] x86/asm/entry/64: Save user RSP in pt_regs-> sp " tip-bot for Denys Vlasenko
2015-03-10 6:00 ` [PATCH 0/4 v2] x86: entry_64.S: steps towards simpler iret frame handling Ingo Molnar
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