From: "Jürgen Groß" <jgross@suse.com>
To: 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 10:15:17 +0200 [thread overview]
Message-ID: <9acced19-573d-4923-9329-8be408d2e555@suse.com> (raw)
In-Reply-To: <7332feff-2649-496c-8e49-b0a19eb54a32@app.fastmail.com>
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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?
Juergen
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next prev parent reply other threads:[~2026-06-29 8:15 UTC|newest]
Thread overview: 12+ 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 31/32] treewide: convert rdmsrq() from a macro to an inline function Juergen Gross
2026-06-29 6:24 ` sashiko-bot
2026-06-29 6:05 ` [PATCH 32/32] x86/msr: Simplify some rdmsrq() use cases 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 [this message]
2026-06-29 8:38 ` Arnd Bergmann
2026-06-30 20:06 ` H. Peter Anvin
2026-06-29 11:19 ` Ingo Molnar
2026-06-30 18:59 ` Sean Christopherson
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