From: Ingo Molnar <mingo@kernel.org>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Xen-devel <xen-devel@lists.xen.org>,
David Vrabel <david.vrabel@citrix.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
lguest@lists.ozlabs.org, stable@vger.kernel.org
Subject: Re: [PATCH] x86/cpu: Fix SMAP check in PVOPS environments
Date: Fri, 5 Jun 2015 09:13:20 +0200 [thread overview]
Message-ID: <20150605071319.GA20449@gmail.com> (raw)
In-Reply-To: <87lhfyuaiu.fsf@rustcorp.com.au>
* Rusty Russell <rusty@rustcorp.com.au> wrote:
> As the comment in arch/x86/include/asm/paravirt_types.h says:
>
> * Get/set interrupt state. save_fl and restore_fl are only
> * expected to use X86_EFLAGS_IF; all other bits
> * returned from save_fl are undefined, and may be ignored by
> * restore_fl.
There should be no 'may' about this: under CONFIG_PARAVIRT_DEBUG=y the reminder of
the flags should be cleared (or all bits should be set: that will instantly crash
if restored verbatim), so that we trip up generic code that relies on non-IF
restoration?
Thanks,
Ingo
next prev parent reply other threads:[~2015-06-05 7:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-03 9:31 [PATCH] x86/cpu: Fix SMAP check in PVOPS environments Andrew Cooper
2015-06-04 6:38 ` H. Peter Anvin
2015-06-04 8:58 ` Andrew Cooper
2015-06-04 19:55 ` Rusty Russell
2015-06-04 20:29 ` H. Peter Anvin
2015-06-05 2:58 ` Rusty Russell
2015-06-05 7:13 ` Ingo Molnar [this message]
2015-06-05 9:33 ` [Xen-devel] " David Vrabel
2015-11-17 14:59 ` Andrew Cooper
2015-11-19 10:12 ` [tip:x86/urgent] " tip-bot for Andrew Cooper
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