linux-kernel - Re: [PATCH v3 43/75] x86/sev-es: Setup per-cpu GHCBs for the runtime handler

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Date:   Fri, 22 May 2020 10:33:21 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Joerg Roedel <joro@...tes.org>
Cc:     x86@...nel.org, hpa@...or.com, Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Joerg Roedel <jroedel@...e.de>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v3 43/75] x86/sev-es: Setup per-cpu GHCBs for the runtime
 handler

On Tue, Apr 28, 2020 at 05:16:53PM +0200, Joerg Roedel wrote:
> @@ -198,6 +210,48 @@ static bool __init sev_es_setup_ghcb(void)
>  	return true;
>  }
>  
> +static void __init sev_es_alloc_runtime_data(int cpu)
> +{
> +	struct sev_es_runtime_data *data;
> +
> +	data = memblock_alloc(sizeof(*data), PAGE_SIZE);
> +	if (!data)
> +		panic("Can't allocate SEV-ES runtime data");
> +
> +	per_cpu(runtime_data, cpu) = data;
> +}
> +
> +static void __init sev_es_init_ghcb(int cpu)

Since those are static functions, I'd drop the "sev_es_" prefix from the
name for better readability. Because otherwise the whole file is a sea
of "sev_es_"-prefixed identifiers which you need to read until the end
to know what they are.

> +{
> +	struct sev_es_runtime_data *data;
> +	int err;
> +
> +	data = per_cpu(runtime_data, cpu);
> +
> +	err = early_set_memory_decrypted((unsigned long)&data->ghcb_page,
> +					 sizeof(data->ghcb_page));
> +	if (err)
> +		panic("Can not map GHCBs unencrypted");

			"Error mapping ..."

> +
> +	memset(&data->ghcb_page, 0, sizeof(data->ghcb_page));
> +}

-- 
Regards/Gruss,
    Boris.

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