From: Borislav Petkov <bp@alien8.de>
To: Andy Lutomirski <luto@amacapital.net>
Cc: X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86/entry: Clarify the RF saving/restoring situation with SYSCALL/SYSRET
Date: Wed, 3 Aug 2016 19:54:12 +0200 [thread overview]
Message-ID: <20160803175412.GE2590@nazgul.tnic> (raw)
In-Reply-To: <CALCETrX=wO69Jkuhb1SFOzpM9LeNfyaYUpMo-uxPEuw-GDTPMA@mail.gmail.com>
On Wed, Aug 03, 2016 at 10:24:18AM -0700, Andy Lutomirski wrote:
> AFAICT the AMD people didn't think of any use cases involving doing
> anything interesting between SYSCALL and SYSRET. Witness the
> sysret_ss_attrs goof, for example: apparently SYSCALL; context switch;
> IRET; interrupt; context switch; SYSRET didn't occur to AMD as a valid
> use case.
/me hands Andy a time machine to go fix this properly, before so much
silicon ships.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
next prev parent reply other threads:[~2016-08-03 18:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-03 10:19 Borislav Petkov
2016-08-03 16:42 ` Andy Lutomirski
2016-08-03 17:14 ` Borislav Petkov
2016-08-03 17:24 ` Andy Lutomirski
2016-08-03 17:54 ` Borislav Petkov [this message]
2016-08-10 18:10 ` [tip:x86/urgent] " tip-bot for Borislav Petkov
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