linux-kernel - Re: [PATCH v3 08/10] x86/mtrr: let cache_aps_delayed_init replace mtrr_aps_delayed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ce8cb1d3-a7d2-7484-26eb-60d3e29fa369@suse.com>
Date:   Tue, 27 Sep 2022 10:57:37 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v3 08/10] x86/mtrr: let cache_aps_delayed_init replace
 mtrr_aps_delayed_init

On 26.09.22 23:11, Borislav Petkov wrote:
> On Thu, Sep 08, 2022 at 10:49:12AM +0200, Juergen Gross wrote:
>> -void set_mtrr_aps_delayed_init(void)
>> -{
>> -	if (!cache_generic)
>> -		return;
>> -
>> -	mtrr_aps_delayed_init = true;
>> -}
>> -
> 
> Except that you've removed the accessors and made that bool global.
> Which is less pretty than it was before...
> 

The accessor would now only need to set the bool, while it had at least
some logic before.

TBH I don't see the point of having an accessor which is just setting a
variable to "true". But if you like it better, I can keep it.

Another possibility would be to move the arch_thaw_secondary_cpus_begin()
and arch_thaw_secondary_cpus_end() functions to cacheinfo.c, resulting
in only a single place outside of cacheinfo.c setting the variable (in
theory the arch_thaw_secondary_cpus_*() functions could just be redefined
to the accessor and cache_aps_init(), but this would be rather hacky IMO).

Juergen

Download attachment "OpenPGP_0xB0DE9DD628BF132F.asc" of type "application/pgp-keys" (3099 bytes)

Download attachment "OpenPGP_signature" of type "application/pgp-signature" (496 bytes)