From: Peter Zijlstra <peterz@infradead.org>
To: linux-kernel@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Rik van Riel <riel@redhat.com>,
daniel.gruss@iaik.tugraz.at, hughd@google.com,
keescook@google.com, linux-mm@kvack.org,
michael.schwarz@iaik.tugraz.at, moritz.lipp@iaik.tugraz.at,
richard.fellner@student.tugraz.at
Subject: Re: [PATCH 1/5] x86/mm/kaiser: Alternative ESPFIX
Date: Mon, 27 Nov 2017 23:39:40 +0100 [thread overview]
Message-ID: <20171127223940.eedtdizvjqclz4xc@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20171127223405.181647306@infradead.org>
On Mon, Nov 27, 2017 at 11:31:11PM +0100, Peter Zijlstra wrote:
> Change the asm to do the CR3 switcheroo so we can remove the magic
> mappings.
>
> Since RDI is unused after SWAPGS we can use it as a scratch reg for
> SWITCH_TO_KERNEL. And once we've computed the new RSP (in RAX) we no
> longer need RDI and can again use it as scratch reg for
> SWITCH_TO_USER.
Forgot to note; this passes tools/testing/selftests/x86/sigreturn_64.
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
next prev parent reply other threads:[~2017-11-27 22:39 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 22:31 [PATCH 0/5] KAISER fixlets Peter Zijlstra
2017-11-27 22:31 ` [PATCH 1/5] x86/mm/kaiser: Alternative ESPFIX Peter Zijlstra
2017-11-27 22:39 ` Peter Zijlstra [this message]
2017-11-27 22:41 ` Dave Hansen
2017-11-27 22:31 ` [PATCH 2/5] x86/mm/kaiser: Add a banner Peter Zijlstra
2017-11-28 3:36 ` Andy Lutomirski
2017-11-28 5:03 ` Josh Poimboeuf
2017-11-28 5:23 ` Andy Lutomirski
2017-11-28 12:54 ` Borislav Petkov
2017-11-27 22:31 ` [PATCH 3/5] x86/mm/kaiser: Revert ("Map the entry stack variables") Peter Zijlstra
2017-11-27 22:31 ` [PATCH 4/5] x86/mm/kaiser: Remove superfluous SWITCH_TO_KERNEL Peter Zijlstra
2017-11-27 22:47 ` Dave Hansen
2017-11-27 22:53 ` Peter Zijlstra
2017-11-27 22:31 ` [PATCH 5/5] x86/mm/kaiser: Disable the SYSCALL-64 trampoline along with KAISER Peter Zijlstra
2017-11-27 22:53 ` Dave Hansen
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