linux-kernel - Re: [PATCH hyperv-next v3 04/15] arch/x86: mshyperv: Trap on access for some synthetic MSRs

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Message-ID: <c495172a-e4a6-4098-bedf-ec43bf3ddd6d@oracle.com>
Date: Wed, 4 Jun 2025 19:08:33 +0530
From: ALOK TIWARI <alok.a.tiwari@...cle.com>
To: Roman Kisel <romank@...ux.microsoft.com>, arnd@...db.de, bp@...en8.de,
        corbet@....net, dave.hansen@...ux.intel.com, decui@...rosoft.com,
        haiyangz@...rosoft.com, hpa@...or.com, kys@...rosoft.com,
        mingo@...hat.com, mhklinux@...look.com, tglx@...utronix.de,
        wei.liu@...nel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Cc: apais@...rosoft.com, benhill@...rosoft.com, bperkins@...rosoft.com,
        sunilmut@...rosoft.com
Subject: Re: [PATCH hyperv-next v3 04/15] arch/x86: mshyperv: Trap on access
 for some synthetic MSRs



On 04-06-2025 06:13, Roman Kisel wrote:
> +			/*
> +			 * Write proxy bit in the case of non-confidential VMBus.
> +			 * Using wrmsl instruction so the following goes to the paravisor.

wrmsl -> wrmsrl

> +			 */
> +			u32 proxy = vmbus_is_confidential() ? 0 : 1;
> +
> +			value |= (proxy << 20);
> +			native_wrmsrl(reg, value);
> +		}
>   	} else {


Thanks,
Alok