From: Ingo Molnar <mingo@kernel.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "Borislav Petkov" <bp@alien8.de>,
"Andy Lutomirski" <luto@kernel.org>, "X86 ML" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Rik van Riel" <riel@redhat.com>,
"Oleg Nesterov" <oleg@redhat.com>,
"Denys Vlasenko" <vda.linux@googlemail.com>,
"Kees Cook" <keescook@chromium.org>,
"Brian Gerst" <brgerst@gmail.com>,
"Paul McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [PATCH v4 14/17] x86/asm/entry/64: Migrate error and interrupt exit work to C
Date: Fri, 3 Jul 2015 08:33:13 +0200 [thread overview]
Message-ID: <20150703063313.GA19561@gmail.com> (raw)
In-Reply-To: <CALCETrUhoxySrDCB0+qsGP3qRzkVML7Kp7-PgfcJdg0xzri6MQ@mail.gmail.com>
* Andy Lutomirski <luto@amacapital.net> wrote:
> If we move even more of this stuff into C, then this problem goes away. "call
> enter_from_user_mode" turns into "enter_from_user_mode()" or similar.
Yes. I think we should first see how that process works out, and then see what
else can be done. For the initial step I'm willing to trade up to 10 cycles in
exchange for sane and maintainable x86 entry code that we can then speed up ...
I presume we are still within that budget?
Thanks,
Ingo
next prev parent reply other threads:[~2015-07-03 6:33 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-29 19:33 [PATCH v4 00/17] x86: Rewrite exit-to-userspace code Andy Lutomirski
2015-06-29 19:33 ` [PATCH v4 01/17] selftests/x86: Add a test for 32-bit fast syscall arg faults Andy Lutomirski
2015-06-29 19:33 ` [PATCH v4 02/17] x86/entry/64/compat: Fix bad fast syscall arg failure path Andy Lutomirski
2015-06-30 10:58 ` Borislav Petkov
2015-06-30 11:06 ` Ingo Molnar
2015-06-30 16:04 ` Andy Lutomirski
2015-07-01 7:43 ` Ingo Molnar
2015-06-29 19:33 ` [PATCH v4 03/17] uml: Fix do_signal() prototype Andy Lutomirski
2015-06-29 20:47 ` Richard Weinberger
2015-06-29 19:33 ` [PATCH v4 04/17] context_tracking: Add ct_state and CT_WARN_ON Andy Lutomirski
2015-06-30 12:20 ` Borislav Petkov
2015-06-30 12:53 ` Ingo Molnar
2015-06-29 19:33 ` [PATCH v4 05/17] notifiers: Assert that RCU is watching in notify_die Andy Lutomirski
2015-06-29 19:33 ` [PATCH v4 06/17] x86: Move C entry and exit code to arch/x86/entry/common.c Andy Lutomirski
2015-06-30 16:32 ` Borislav Petkov
2015-06-29 19:33 ` [PATCH v4 07/17] x86/traps: Assert that we're in CONTEXT_KERNEL in exception entries Andy Lutomirski
2015-06-30 17:01 ` Borislav Petkov
2015-06-30 17:08 ` Andy Lutomirski
2015-06-30 17:15 ` Borislav Petkov
2015-06-29 19:33 ` [PATCH v4 08/17] x86/entry: Add enter_from_user_mode and use it in syscalls Andy Lutomirski
2015-07-01 10:24 ` Borislav Petkov
2015-06-29 19:33 ` [PATCH v4 09/17] x86/entry: Add new, comprehensible entry and exit hooks Andy Lutomirski
2015-07-02 9:48 ` Borislav Petkov
2015-07-02 16:03 ` Andy Lutomirski
2015-07-02 16:25 ` Borislav Petkov
2015-06-29 19:33 ` [PATCH v4 10/17] x86/entry/64: Really create an error-entry-from-usermode code path Andy Lutomirski
2015-07-02 10:25 ` Borislav Petkov
2015-07-02 15:33 ` Andy Lutomirski
2015-07-02 16:29 ` Borislav Petkov
2015-06-29 19:33 ` [PATCH v4 11/17] x86/entry/64: Migrate 64-bit and compat syscalls to new exit hooks Andy Lutomirski
2015-07-02 10:49 ` Borislav Petkov
2015-07-02 15:56 ` Andy Lutomirski
2015-07-02 16:56 ` Denys Vlasenko
2015-06-29 19:33 ` [PATCH v4 12/17] x86/asm/entry/64: Save all regs on interrupt entry Andy Lutomirski
2015-07-02 10:52 ` Borislav Petkov
2015-07-02 15:33 ` Andy Lutomirski
2015-06-29 19:33 ` [PATCH v4 13/17] x86/asm/entry/64: Simplify irq stack pt_regs handling Andy Lutomirski
2015-06-29 19:33 ` [PATCH v4 14/17] x86/asm/entry/64: Migrate error and interrupt exit work to C Andy Lutomirski
2015-07-02 12:09 ` Borislav Petkov
2015-07-02 16:09 ` Andy Lutomirski
2015-07-02 16:33 ` Borislav Petkov
2015-07-03 6:33 ` Ingo Molnar [this message]
2015-07-03 16:27 ` Andy Lutomirski
2015-07-03 16:29 ` Andy Lutomirski
2015-07-03 14:37 ` Denys Vlasenko
2015-07-03 16:24 ` Andy Lutomirski
2015-07-04 8:12 ` Ingo Molnar
2015-06-29 19:33 ` [PATCH v4 15/17] x86/entry: Remove exception_enter from most trap handlers Andy Lutomirski
2015-06-29 19:33 ` [PATCH v4 16/17] x86/entry: Remove SCHEDULE_USER and asm/context-tracking.h Andy Lutomirski
2015-06-29 19:33 ` [PATCH v4 17/17] x86/irq: Document how IRQ context tracking works and add an assertion Andy Lutomirski
2015-06-29 19:46 ` [PATCH v4 00/17] x86: Rewrite exit-to-userspace code Richard Weinberger
2015-06-29 20:14 ` Andy Lutomirski
2015-07-02 16:45 ` Borislav Petkov
2015-07-03 6:34 ` Ingo Molnar
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