Date:   Wed, 29 Dec 2021 12:59:37 +0100
From:   Borislav Petkov <bp@alien8.de>
To:     "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc:     tglx@linutronix.de, mingo@redhat.com, dave.hansen@intel.com,
        luto@kernel.org, peterz@infradead.org,
        sathyanarayanan.kuppuswamy@linux.intel.com, aarcange@redhat.com,
        ak@linux.intel.com, dan.j.williams@intel.com, david@redhat.com,
        hpa@zytor.com, jgross@suse.com, jmattson@google.com,
        joro@8bytes.org, jpoimboe@redhat.com, knsathya@kernel.org,
        pbonzini@redhat.com, sdeep@vmware.com, seanjc@google.com,
        tony.luck@intel.com, vkuznets@redhat.com, wanpengli@tencent.com,
        x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 06/26] x86/tdx: Add MSR support for TDX guests
Message-ID: <YcxNqavkZylqoHjw@zn.tnic>
References: <20211214150304.62613-1-kirill.shutemov@linux.intel.com>
 <20211214150304.62613-7-kirill.shutemov@linux.intel.com>
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On Tue, Dec 14, 2021 at 06:02:44PM +0300, Kirill A. Shutemov wrote:
> +static bool tdx_read_msr_safe(unsigned int msr, u64 *val)
> +{
> +	struct tdx_hypercall_output out;
> +
> +	/*
> +	 * Emulate the MSR read via hypercall. More info about ABI
> +	 * can be found in TDX Guest-Host-Communication Interface
> +	 * (GHCI), sec titled "TDG.VP.VMCALL<Instruction.RDMSR>".
> +	 */
> +	if (_tdx_hypercall(EXIT_REASON_MSR_READ, msr, 0, 0, 0, &out))
> +		return false;
> +
> +	*val = out.r11;
> +
> +	return true;
> +}
> +
> +static bool tdx_write_msr_safe(unsigned int msr, unsigned int low,

Why the "_safe" suffix?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette