From: Arjan van de Ven <arjan@linux.intel.com>
To: Andy Lutomirski <luto@amacapital.net>, Jan Kara <jack@suse.cz>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
xen-devel <Xen-devel@lists.xen.org>,
Borislav Petkov <bp@alien8.de>, X86 ML <x86@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Petr Mladek <pmladek@suse.cz>, KVM list <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v5 3/9] x86/head: Move early exception panic code into early_fixup_exception
Date: Mon, 4 Apr 2016 08:36:35 -0700 [thread overview]
Message-ID: <57028A03.3000902@linux.intel.com> (raw)
In-Reply-To: <CALCETrVriftUPNZ8pCQ1x9TWDHnRx8fWUvJgCQToPEOxqMLb3w@mail.gmail.com>
On 4/4/2016 8:32 AM, Andy Lutomirski wrote:
>
> Adding locking would be easy enough, wouldn't it?
>
> But do any platforms really boot a second CPU before switching to real
> printk? Given that I see all the smpboot stuff in dmesg, I guess real
> printk happens first. I admit I haven't actually checked.
adding locking also makes things more fragile in terms of getting the last thing out
before you go down in flaming death....
until it's a proven problem, this early, get the message out at all is more important
than getting it out perfectly, sometimes.
next prev parent reply other threads:[~2016-04-04 15:36 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-02 14:01 [PATCH v5 0/9] Improve non-"safe" MSR access failure handling Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 1/9] x86/head: Pass a real pt_regs and trapnr to early_fixup_exception Andy Lutomirski
2016-04-02 14:01 ` Andy Lutomirski
2016-04-13 11:43 ` [tip:x86/asm] x86/head: Pass a real pt_regs and trapnr to early_fixup_exception() tip-bot for Andy Lutomirski
2016-04-13 11:43 ` tip-bot for Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 2/9] x86/head: Move the early NMI fixup into C Andy Lutomirski
2016-04-02 14:01 ` Andy Lutomirski
2016-04-13 11:43 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-13 11:43 ` tip-bot for Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 3/9] x86/head: Move early exception panic code into early_fixup_exception Andy Lutomirski
2016-04-02 14:01 ` Andy Lutomirski
2016-04-02 18:39 ` Borislav Petkov
2016-04-02 18:39 ` Borislav Petkov
2016-04-02 20:13 ` Andy Lutomirski
2016-04-02 20:47 ` Borislav Petkov
2016-04-02 20:47 ` Borislav Petkov
2016-04-02 20:58 ` Andy Lutomirski
2016-04-02 20:58 ` Andy Lutomirski
2016-04-04 11:52 ` Jan Kara
2016-04-04 11:52 ` Jan Kara
2016-04-04 12:46 ` Peter Zijlstra
2016-04-04 12:46 ` Peter Zijlstra
2016-04-04 15:32 ` Andy Lutomirski
2016-04-04 15:36 ` Arjan van de Ven
2016-04-04 15:36 ` Arjan van de Ven [this message]
2016-04-04 16:00 ` Peter Zijlstra
2016-04-04 16:00 ` Peter Zijlstra
2016-04-04 19:38 ` Borislav Petkov
2016-04-04 19:38 ` Borislav Petkov
2016-04-04 21:31 ` Andy Lutomirski
2016-04-04 21:40 ` Borislav Petkov
2016-04-04 21:40 ` Borislav Petkov
2016-04-04 21:31 ` Andy Lutomirski
2016-04-04 15:32 ` Andy Lutomirski
2016-04-02 20:13 ` Andy Lutomirski
2016-04-13 11:44 ` [tip:x86/asm] x86/head: Move early exception panic code into early_fixup_exception() tip-bot for Andy Lutomirski
2016-04-13 11:44 ` tip-bot for Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 4/9] x86/traps: Enable all exception handler callbacks early Andy Lutomirski
2016-04-02 18:52 ` Borislav Petkov
2016-04-02 20:16 ` Andy Lutomirski
2016-04-02 20:52 ` Borislav Petkov
2016-04-02 20:52 ` Borislav Petkov
2016-04-03 8:07 ` Borislav Petkov
2016-04-03 8:07 ` Borislav Petkov
2016-04-03 13:22 ` Andy Lutomirski
2016-04-03 13:22 ` Andy Lutomirski
2016-04-03 13:51 ` Linus Torvalds
2016-04-03 13:51 ` Linus Torvalds
2016-04-03 13:55 ` Andy Lutomirski
2016-04-03 14:10 ` Borislav Petkov
2016-04-03 14:10 ` Borislav Petkov
2016-04-04 15:47 ` Andy Lutomirski
2016-04-04 15:47 ` Andy Lutomirski
2016-04-03 14:17 ` Linus Torvalds
2016-04-03 14:17 ` Linus Torvalds
2016-04-03 13:55 ` Andy Lutomirski
2016-04-02 20:16 ` Andy Lutomirski
2016-04-02 18:52 ` Borislav Petkov
2016-04-13 11:44 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-13 11:44 ` tip-bot for Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 4/9] " Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 5/9] x86/paravirt: Add _safe to the read_msr and write_msr PV hooks Andy Lutomirski
2016-04-02 14:01 ` Andy Lutomirski
2016-04-03 8:41 ` Borislav Petkov
2016-04-03 13:23 ` Andy Lutomirski
2016-04-03 14:07 ` Borislav Petkov
2016-04-03 14:07 ` Borislav Petkov
2016-04-03 13:23 ` Andy Lutomirski
2016-04-03 8:41 ` Borislav Petkov
2016-04-13 11:44 ` [tip:x86/asm] x86/paravirt: Add _safe to the read_ms()r and write_msr() PV callbacks tip-bot for Andy Lutomirski
2016-04-13 11:44 ` tip-bot for Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 6/9] x86/msr: Carry on after a non-"safe" MSR access fails Andy Lutomirski
2016-04-02 14:01 ` Andy Lutomirski
2016-04-13 11:45 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-13 11:45 ` tip-bot for Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 7/9] x86/paravirt: Add paravirt_{read, write}_msr Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 7/9] x86/paravirt: Add paravirt_{read,write}_msr Andy Lutomirski
2016-04-04 16:33 ` [PATCH v5 7/9] x86/paravirt: Add paravirt_{read, write}_msr David Vrabel
2016-04-04 16:33 ` [Xen-devel] " David Vrabel
2016-04-04 16:40 ` Andy Lutomirski
2016-04-04 16:40 ` Andy Lutomirski
2016-04-13 11:45 ` [tip:x86/asm] x86/paravirt: Add paravirt_{read, write}_msr() tip-bot for Andy Lutomirski
2016-04-13 11:45 ` [tip:x86/asm] x86/paravirt: Add paravirt_{read,write}_msr() tip-bot for Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 8/9] x86/paravirt: Make "unsafe" MSR accesses unsafe even if PARAVIRT=y Andy Lutomirski
2016-04-02 14:01 ` Andy Lutomirski
2016-04-13 11:46 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-13 11:46 ` tip-bot for Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 9/9] x86/msr: Set the return value to zero when native_rdmsr_safe fails Andy Lutomirski
2016-04-13 11:46 ` [tip:x86/asm] x86/msr: Set the return value to zero when native_rdmsr_safe() fails tip-bot for Andy Lutomirski
2016-04-13 11:46 ` tip-bot for Andy Lutomirski
2016-04-02 14:01 ` [PATCH v5 9/9] x86/msr: Set the return value to zero when native_rdmsr_safe fails Andy Lutomirski
2016-04-02 14:24 ` [PATCH v5 0/9] Improve non-"safe" MSR access failure handling Linus Torvalds
2016-04-02 15:13 ` Andy Lutomirski
2016-04-02 15:21 ` Linus Torvalds
2016-04-02 15:21 ` Linus Torvalds
2016-04-02 15:13 ` Andy Lutomirski
2016-04-02 14:24 ` Linus Torvalds
2016-04-04 16:23 ` Borislav Petkov
2016-04-04 16:23 ` Borislav Petkov
2016-04-05 15:38 ` Boris Ostrovsky
2016-04-05 15:38 ` [Xen-devel] " Boris Ostrovsky
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