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From: Tom Lendacky <thomas.lendacky@amd.com>
To: Dov Murik <dovmurik@linux.ibm.com>, linux-efi@vger.kernel.org
Cc: Laszlo Ersek <lersek@redhat.com>,
	Ashish Kalra <ashish.kalra@amd.com>,
	Brijesh Singh <brijesh.singh@amd.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	James Morris <jmorris@namei.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	Andi Kleen <ak@linux.intel.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	James Bottomley <jejb@linux.ibm.com>,
	Tobin Feldman-Fitzthum <tobin@linux.ibm.com>,
	Jim Cadden <jcadden@ibm.com>,
	linux-coco@lists.linux.dev,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 2/3] efi: Reserve confidential computing secret area
Date: Mon, 28 Jun 2021 15:40:02 -0500	[thread overview]
Message-ID: <9b9b682f-297e-9ebd-4d67-43c3ed9ad8c5@amd.com> (raw)
In-Reply-To: <20210628183431.953934-3-dovmurik@linux.ibm.com>

On 6/28/21 1:34 PM, Dov Murik wrote:
> When efi-stub copies an EFI-provided confidential computing secret area,
> reserve that memory block for future use within the kernel.
> 
> Signed-off-by: Dov Murik <dovmurik@linux.ibm.com>
> ---
>  drivers/firmware/efi/Makefile                 |  2 +-
>  drivers/firmware/efi/confidential-computing.c | 41 +++++++++++++++++++
>  drivers/firmware/efi/efi.c                    |  5 +++
>  include/linux/efi.h                           |  4 ++
>  4 files changed, 51 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/firmware/efi/confidential-computing.c
> 
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 4f647f1ee298..e9740bd16db0 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -551,6 +551,8 @@ extern struct efi {
>  	unsigned long			tpm_log;		/* TPM2 Event Log table */
>  	unsigned long			tpm_final_log;		/* TPM2 Final Events Log table */
>  	unsigned long			mokvar_table;		/* MOK variable config table */
> +	unsigned long			confidential_computing_secret;	/* Confidential computing */
> +									/* secret table           */

If there is any possibility that someone could reuse a form of this
confidential computing secret table in a bare metal system, then this
table needs to be added to the efi_tables[] array in
arch/x86/platform/efi/efi.c. Otherwise, it will be mapped improperly on a
system with SME active.

Thanks,
Tom

>  
>  	efi_get_time_t			*get_time;
>  	efi_set_time_t			*set_time;
> @@ -1190,6 +1192,8 @@ extern int efi_tpm_final_log_size;
>  
>  extern unsigned long rci2_table_phys;
>  
> +extern int efi_confidential_computing_secret_area_reserve(void);
> +
>  /*
>   * efi_runtime_service() function identifiers.
>   * "NONE" is used by efi_recover_from_page_fault() to check if the page
> 

  reply	other threads:[~2021-06-28 20:40 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-28 18:34 [RFC PATCH v2 0/3] Allow access to " Dov Murik
2021-06-28 18:34 ` [RFC PATCH v2 1/3] efi/libstub: Copy " Dov Murik
2021-06-28 18:34 ` [RFC PATCH v2 2/3] efi: Reserve " Dov Murik
2021-06-28 20:40   ` Tom Lendacky [this message]
2021-06-29  6:04     ` Dov Murik
2021-06-28 18:34 ` [RFC PATCH v2 3/3] virt: Add sev_secret module to expose confidential computing secrets Dov Murik
2021-06-28 19:30   ` Borislav Petkov
2021-06-29  7:23     ` Dov Murik
2021-06-29 22:48       ` Borislav Petkov
2021-06-28 19:28 ` [RFC PATCH v2 0/3] Allow access to confidential computing secret area Borislav Petkov
2021-06-29  7:16   ` Dov Murik
2021-06-29 17:33     ` Borislav Petkov

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