linux-kernel - Re: [PATCH 0/4 v2] x86: entry_64.S: steps towards simpler iret frame handling

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Date:	Tue, 10 Mar 2015 07:00:13 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4 v2] x86: entry_64.S: steps towards simpler iret frame
 handling


* Denys Vlasenko <dvlasenk@...hat.com> wrote:

> 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.

Unfortunately I got only 1/4 and 3/4, the other two patches are 
missing. They are not in my lkml and spam folders either.

Note that the missing mails:

> 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

2/4 and 4/4 Have rather short titles, so maybe some spam trap ate 
them? Prefix them with 'x86: '?

Weird.

Thanks,

	Ingo
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