From: "Arnd Bergmann" <arnd@arndb.de>
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Subject: Re: [PATCH 00/32] x86/msr: Drop 32-bit MSR interfaces
Date: Mon, 29 Jun 2026 10:38:16 +0200 [thread overview]
Message-ID: <d315e0a8-e4e9-4f7e-80a9-7c236849eabd@app.fastmail.com> (raw)
In-Reply-To: <9acced19-573d-4923-9329-8be408d2e555@suse.com>
On Mon, Jun 29, 2026, at 10:15, Jürgen Groß wrote:
> On 29.06.26 10:06, Arnd Bergmann wrote:
>> On Mon, Jun 29, 2026, at 09:01, Jürgen Groß wrote:
>>> On 29.06.26 08:52, Arnd Bergmann wrote:
>>>> On Mon, Jun 29, 2026, at 08:04, Juergen Gross wrote:
>>>>
>>>> I assume this is fine, but since you don't mention it explicitly here,
>>>> please clarify what this means for 32-bit CPUs without the rdmsrq
>>>> instruction. Those will continue using the same instructions as before
>>>> and just change the calling conventions, right?
>>>
>>> Yes. I thought this would be clear from the following:
>>>
>>> - They are based on primitives using 64-bit sized values anyway.
>>
>> Right, that was my reading of it as well, but it's not entirely
>> clear when the function name is the same as the mnemonic of an
>> instruction that only exists on newer CPUs and the later patch
>
> There is no RDMSRQ instruction on any x86 CPU. Are you mixing this up with
> WRMSRNS/RDMSR using an immediate for addressing the MSR?
Yes, I was just confused about the exact definition here and assumed
the single-register output version was actually called rdmsrq.
Arnd
next prev parent reply other threads:[~2026-06-29 8:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-29 6:04 [PATCH 00/32] x86/msr: Drop 32-bit MSR interfaces Juergen Gross
2026-06-29 6:05 ` [PATCH 24/32] drivers/gpio: Stop using " Juergen Gross
2026-06-29 10:33 ` Bartosz Golaszewski
2026-06-29 6:05 ` [PATCH 31/32] treewide: convert rdmsrq() from a macro to an inline function Juergen Gross
2026-06-29 6:52 ` [PATCH 00/32] x86/msr: Drop 32-bit MSR interfaces Arnd Bergmann
2026-06-29 7:01 ` Jürgen Groß
2026-06-29 8:06 ` Arnd Bergmann
2026-06-29 8:15 ` Jürgen Groß
2026-06-29 8:38 ` Arnd Bergmann [this message]
2026-06-29 11:19 ` Ingo Molnar
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