linux-kernel - Re: [RFC PATCH v1 01/15] x86/msr: Replace __wrmsr() with native

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: <Z_bQV2oOnJlwbxnk@gmail.com>
Date: Wed, 9 Apr 2025 21:53:59 +0200
From: Ingo Molnar <mingo@...nel.org>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Dave Hansen <dave.hansen@...el.com>, Xin Li <xin@...or.com>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	linux-hyperv@...r.kernel.org, virtualization@...ts.linux.dev,
	linux-edac@...r.kernel.org, kvm@...r.kernel.org,
	xen-devel@...ts.xenproject.org, linux-ide@...r.kernel.org,
	linux-pm@...r.kernel.org, bpf@...r.kernel.org, llvm@...ts.linux.dev,
	tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
	dave.hansen@...ux.intel.com, x86@...nel.org, jgross@...e.com,
	andrew.cooper3@...rix.com, peterz@...radead.org, acme@...nel.org,
	namhyung@...nel.org, mark.rutland@....com,
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
	irogers@...gle.com, adrian.hunter@...el.com,
	kan.liang@...ux.intel.com, wei.liu@...nel.org,
	ajay.kaher@...adcom.com, alexey.amakhalov@...adcom.com,
	bcm-kernel-feedback-list@...adcom.com, tony.luck@...el.com,
	pbonzini@...hat.com, vkuznets@...hat.com, seanjc@...gle.com,
	luto@...nel.org, boris.ostrovsky@...cle.com, kys@...rosoft.com,
	haiyangz@...rosoft.com, decui@...rosoft.com
Subject: Re: [RFC PATCH v1 01/15] x86/msr: Replace __wrmsr() with
 native_wrmsrl()


* H. Peter Anvin <hpa@...or.com> wrote:

> On April 2, 2025 8:41:07 AM PDT, Dave Hansen <dave.hansen@...el.com> wrote:
> >On 3/31/25 22:53, Xin Li wrote:
> >> Per "struct msr" defined in arch/x86/include/asm/shared/msr.h:
> >> 
> >> struct msr {
> >>         union {
> >>                 struct {
> >>                         u32 l;
> >>                         u32 h;
> >>                 };
> >>                 u64 q;
> >>         };
> >> };
> >> 
> >> Probably *msrq() is what we want?
> >
> > What would folks think about "wrmsr64()"? It's writing a 64-bit 
> > value to an MSR and there are a lot of functions in the kernel that 
> > are named with the argument width in bits.
> 
> Personally, I hate the extra verbosity, mostly visual, since numerals 
> are nearly as prominent as capital letters they tend to attract the 
> eye. There is a reason why they aren't used this way in assembly 
> languages.

So what's the consensus here? Both work for me, but I have to pick one. :-)

Thanks,

	Ingo