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

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Message-ID: <Z-pruogreCuU66wm@gmail.com>
Date: Mon, 31 Mar 2025 12:17:30 +0200
From: Ingo Molnar <mingo@...nel.org>
To: "Xin Li (Intel)" <xin@...or.com>
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Subject: Re: [RFC PATCH v1 01/15] x86/msr: Replace __wrmsr() with
 native_wrmsrl()


* Xin Li (Intel) <xin@...or.com> wrote:

> -	__wrmsr      (MSR_AMD_DBG_EXTN_CFG, val | 3ULL << 3, val >> 32);
> +	native_wrmsrl(MSR_AMD_DBG_EXTN_CFG, val | 3ULL << 3);

This is an improvement.

> -	__wrmsr      (MSR_IA32_PQR_ASSOC, rmid_p, plr->closid);
> +	native_wrmsrl(MSR_IA32_PQR_ASSOC, (u64)plr->closid << 32 | rmid_p);

> -	__wrmsr      (MSR_IA32_PQR_ASSOC, rmid_p, closid_p);
> +	native_wrmsrl(MSR_IA32_PQR_ASSOC, (u64)closid_p << 32 | rmid_p);

This is not an improvement.

Please provide a native_wrmsrl() API variant where natural [rmid_p, closid_p]
high/lo parameters can be used, without the shift-uglification...

Thanks,

	Ingo