linux-kernel - Re: [PATCH v9 3/3] x86/snp: Convert shared memory back to private on kexec

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]

Date: Tue, 25 Jun 2024 05:59:09 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Kalra, Ashish" <ashish.kalra@....com>
Cc: tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
	x86@...nel.org, rafael@...nel.org, hpa@...or.com,
	peterz@...radead.org, adrian.hunter@...el.com,
	sathyanarayanan.kuppuswamy@...ux.intel.com, jun.nakajima@...el.com,
	rick.p.edgecombe@...el.com, thomas.lendacky@....com,
	michael.roth@....com, seanjc@...gle.com, kai.huang@...el.com,
	bhe@...hat.com, kirill.shutemov@...ux.intel.com, bdas@...hat.com,
	vkuznets@...hat.com, dionnaglaze@...gle.com, anisinha@...hat.com,
	jroedel@...e.de, ardb@...nel.org, dyoung@...hat.com,
	kexec@...ts.infradead.org, linux-coco@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 3/3] x86/snp: Convert shared memory back to private on
 kexec

On Mon, Jun 24, 2024 at 03:57:34PM -0500, Kalra, Ashish wrote:
> ...  Hence, added simple static functions make_pte_private() and
> set_pte_enc() to make use of the more optimized snp_set_memory_private() to
> use the GHCB instead of the MSR protocol. Additionally, make_pte_private()
> adds check for GHCB addresses during unshare_all_memory() loop.

IOW, what you're saying is: "Boris, what you're asking can't be done."

Well, what *you're* asking - for me to maintain crap - can't be done either.
So this will stay where it is.

Unless you make a genuine effort and refactor the code...

-- 
Regards/Gruss,
    Boris.

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