linux-kernel - Re: [PATCH v1 2/3] x86/traps: Initialize DR7 by writing its architectural reset value

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: <20250613081610.GK2273038@noisy.programming.kicks-ass.net>
Date: Fri, 13 Jun 2025 10:16:10 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Xin Li <xin@...or.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
	seanjc@...gle.com, pbonzini@...hat.com, brgerst@...il.com,
	tony.luck@...el.com, fenghuay@...dia.com
Subject: Re: [PATCH v1 2/3] x86/traps: Initialize DR7 by writing its
 architectural reset value

On Fri, Jun 13, 2025 at 12:59:04AM -0700, H. Peter Anvin wrote:

> Incidentally, do you know the following x86 register sequences in the proper order?
> 
> ax, cx, dx, bx, sp, bp, si, di, ...

Yes, I get annoyed at that every time I decode regs :-)

> al, cl, dl, bl, ah, ch, dh, bh
> es, cs, ss, ds, fs, gs

These I don't know from the top of my head -- I've not had to use them enough.