linux-kernel - Re: [PATCH v5 14/32] efi: Add an EFI table address match function

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Date:   Mon, 15 May 2017 20:09:13 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org, Rik van Riel <riel@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Toshimitsu Kani <toshi.kani@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dave Young <dyoung@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v5 14/32] efi: Add an EFI table address match function

On Tue, Apr 18, 2017 at 04:18:48PM -0500, Tom Lendacky wrote:
> Add a function that will determine if a supplied physical address matches
> the address of an EFI table.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> ---
>  drivers/firmware/efi/efi.c |   33 +++++++++++++++++++++++++++++++++
>  include/linux/efi.h        |    7 +++++++
>  2 files changed, 40 insertions(+)
> 
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index b372aad..8f606a3 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -55,6 +55,25 @@ struct efi __read_mostly efi = {
>  };
>  EXPORT_SYMBOL(efi);
>  
> +static unsigned long *efi_tables[] = {
> +	&efi.mps,
> +	&efi.acpi,
> +	&efi.acpi20,
> +	&efi.smbios,
> +	&efi.smbios3,
> +	&efi.sal_systab,
> +	&efi.boot_info,
> +	&efi.hcdp,
> +	&efi.uga,
> +	&efi.uv_systab,
> +	&efi.fw_vendor,
> +	&efi.runtime,
> +	&efi.config_table,
> +	&efi.esrt,
> +	&efi.properties_table,
> +	&efi.mem_attr_table,
> +};
> +
>  static bool disable_runtime;
>  static int __init setup_noefi(char *arg)
>  {
> @@ -854,6 +873,20 @@ int efi_status_to_err(efi_status_t status)
>  	return err;
>  }
>  
> +bool efi_table_address_match(unsigned long phys_addr)

efi_is_table_address() reads easier/better in the code.

-- 
Regards/Gruss,
    Boris.

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