linux-kernel - Re: [Xen-devel] [PATCH 1/7] x86/xen: Simplify set_aliased

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Date:	Sat, 11 Jun 2016 11:29:06 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	David Vrabel <david.vrabel@...rix.com>,
	Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Brian Gerst <brgerst@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	xen-devel <xen-devel@...ts.xen.org>,
	Jan Beulich <jbeulich@...e.com>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH 1/7] x86/xen: Simplify set_aliased_prot


* Andy Lutomirski <luto@...capital.net> wrote:

> On Wed, May 25, 2016 at 2:50 AM, David Vrabel <david.vrabel@...rix.com> wrote:
> > On 24/05/16 23:48, Andy Lutomirski wrote:
> >> In aa1acff356bb ("x86/xen: Probe target addresses in
> >> set_aliased_prot() before the hypercall"), I added an explicit probe
> >> to work around a hypercall issue.  The code can be simplified by
> >> using probe_kernel_read.
> >
> > Acked-by: David Vrabel <david.vrabel@...rix.com>
> 
> Ingo, can you apply this one patch directly to x86/asm?  The rest of
> the series is stalled pending my fixing Borislav's review comments
> and, more importantly, fixing the bugs that testing it has shaken
> loose.  This patch is a nice cleanup all by itself, though.

Ok, agreed, done.

Note that I simplified it some more:

-       probe_kernel_read(&dummy, (unsigned char *)v, 1);
+       probe_kernel_read(&dummy, v, 1);

... because 'v' already has a 'void *' natural type.

Thanks,

	Ingo