linux-kernel - Re: [PATCH v2 07/10] x86/entry: Vastly simplify SYSENTER TF handling

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Message-ID: <20160306180143.GB6902@pd.tnic>
Date:	Sun, 6 Mar 2016 19:01:43 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Brian Gerst <brgerst@...il.com>, Andy Lutomirski <luto@...nel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>
Subject: Re: [PATCH v2 07/10] x86/entry: Vastly simplify SYSENTER TF handling

On Sun, Mar 06, 2016 at 09:36:42AM -0800, Andy Lutomirski wrote:
> > ALTERNATIVE "movl TSS_sysenter_sp0(%esp), %esp", "addl $5*4, %esp",
> > X86_FEATURE_XENPV
> 
> That might work.

Yap, and as we said on IRC, KALLSYMS can be off - even if it is "if
EXPERT" so we need to think of a better way to compute start address and
size of entry_SYSENTER_32 and the _compat one.

We probably could reuse some of the ELF parsing machinery of relocs.c or
so...

-- 
Regards/Gruss,
    Boris.

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