linux-kernel - Re: [PATCH Part2 v6 07/49] x86/sev: Invalid pages from direct map when adding it to RMP table

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 for Android: free password hash cracker in your pocket

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

Message-ID: <Y2JUJfKLS/ghCP0R@zn.tnic>
Date:   Wed, 2 Nov 2022 12:27:33 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Kalra, Ashish" <ashish.kalra@....com>
Cc:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "jroedel@...e.de" <jroedel@...e.de>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        "hpa@...or.com" <hpa@...or.com>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "slp@...hat.com" <slp@...hat.com>,
        "pgonda@...gle.com" <pgonda@...gle.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "srinivas.pandruvada@...ux.intel.com" 
        <srinivas.pandruvada@...ux.intel.com>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "dovmurik@...ux.ibm.com" <dovmurik@...ux.ibm.com>,
        "tobin@....com" <tobin@....com>,
        "Roth, Michael" <Michael.Roth@....com>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "kirill@...temov.name" <kirill@...temov.name>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "marcorr@...gle.com" <marcorr@...gle.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "alpergun@...gle.com" <alpergun@...gle.com>,
        "dgilbert@...hat.com" <dgilbert@...hat.com>,
        "jarkko@...nel.org" <jarkko@...nel.org>
Subject: Re: [PATCH Part2 v6 07/49] x86/sev: Invalid pages from direct map
 when adding it to RMP table

On Tue, Nov 01, 2022 at 10:12:35PM -0500, Kalra, Ashish wrote:
> Following up on this, now, set_memory_present() is a static interface,
> so will need do add a new external API like set_memory_p() similar
> to set_memory_np().

It is called set_memory_p() now and you can "un-static" it. :)

> So currently there is no interface defined for changing the attribute of a
> range to present or restoring the range in the direct map.

No?

static int set_memory_p(unsigned long *addr, int numpages)
{
        return change_page_attr_set(addr, numpages, __pgprot(_PAGE_PRESENT), 0);
}

:-)

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette