From: Dave Hansen <dave.hansen@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>, linux-kernel@vger.kernel.org
Cc: 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 5/5] x86/mm/kaiser: Disable the SYSCALL-64 trampoline along with KAISER
Date: Mon, 27 Nov 2017 14:53:43 -0800 [thread overview]
Message-ID: <dffd1146-5cc5-ae14-ec10-3df312703790@linux.intel.com> (raw)
In-Reply-To: <20171127223405.381212307@infradead.org>
On 11/27/2017 02:31 PM, Peter Zijlstra wrote:
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -1442,7 +1442,10 @@ void syscall_init(void)
> (entry_SYSCALL_64_trampoline - _entry_trampoline);
>
> wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS);
> - wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline);
> + if (kaiser_enabled)
> + wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline);
> + else
> + wrmsrl(MSR_LSTAR, (unsigned long)entry_SYSCALL_64);
Heh, ask and ye shall receive, I guess.
We do need a Documentation/ update now. For this, and other things.
I'll put something together.
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prev parent reply other threads:[~2017-11-27 22:53 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
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 [this message]
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