linux-kernel - Re: [PATCH v2 14/14] virt: arm-cca-guest: TSM

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Message-ID: <87ac462c-c453-4f3a-9b0e-5542727578aa@arm.com>
Date: Wed, 24 Apr 2024 14:19:30 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Sami Mujawar <sami.mujawar@....com>,
 Catalin Marinas <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>,
 Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
 Oliver Upton <oliver.upton@...ux.dev>, Zenghui Yu <yuzenghui@...wei.com>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Joey Gouly <joey.gouly@....com>, Alexandru Elisei
 <alexandru.elisei@....com>, Christoffer Dall <christoffer.dall@....com>,
 Fuad Tabba <tabba@...gle.com>, linux-coco@...ts.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>
Subject: Re: [PATCH v2 14/14] virt: arm-cca-guest: TSM_REPORT support for
 realms

On 12/04/2024 09:42, Steven Price wrote:
> From: Sami Mujawar <sami.mujawar@....com>
> 
> Introduce an arm-cca-guest driver that registers with
> the configfs-tsm module to provide user interfaces for
> retrieving an attestation token.
> 
> When a new report is requested the arm-cca-guest driver
> invokes the appropriate RSI interfaces to query an
> attestation token.
> 
> The steps to retrieve an attestation token are as follows:
>    1. Mount the configfs filesystem if not already mounted
>       mount -t configfs none /sys/kernel/config
>    2. Generate an attestation token
>       report=/sys/kernel/config/tsm/report/report0
>       mkdir $report
>       dd if=/dev/urandom bs=64 count=1 > $report/inblob
>       hexdump -C $report/outblob
>       rmdir $report
> 
> Signed-off-by: Sami Mujawar <sami.mujawar@....com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
>   drivers/virt/coco/Kconfig                     |   2 +
>   drivers/virt/coco/Makefile                    |   1 +
>   drivers/virt/coco/arm-cca-guest/Kconfig       |  11 +
>   drivers/virt/coco/arm-cca-guest/Makefile      |   2 +
>   .../virt/coco/arm-cca-guest/arm-cca-guest.c   | 208 ++++++++++++++++++
>   5 files changed, 224 insertions(+)
>   create mode 100644 drivers/virt/coco/arm-cca-guest/Kconfig
>   create mode 100644 drivers/virt/coco/arm-cca-guest/Makefile
>   create mode 100644 drivers/virt/coco/arm-cca-guest/arm-cca-guest.c
> 
> diff --git a/drivers/virt/coco/Kconfig b/drivers/virt/coco/Kconfig
> index 87d142c1f932..4fb69804b622 100644
> --- a/drivers/virt/coco/Kconfig
> +++ b/drivers/virt/coco/Kconfig
> @@ -12,3 +12,5 @@ source "drivers/virt/coco/efi_secret/Kconfig"
>   source "drivers/virt/coco/sev-guest/Kconfig"
>   
>   source "drivers/virt/coco/tdx-guest/Kconfig"
> +
> +source "drivers/virt/coco/arm-cca-guest/Kconfig"
> diff --git a/drivers/virt/coco/Makefile b/drivers/virt/coco/Makefile
> index 18c1aba5edb7..a6228a1bf992 100644
> --- a/drivers/virt/coco/Makefile
> +++ b/drivers/virt/coco/Makefile
> @@ -6,3 +6,4 @@ obj-$(CONFIG_TSM_REPORTS)	+= tsm.o
>   obj-$(CONFIG_EFI_SECRET)	+= efi_secret/
>   obj-$(CONFIG_SEV_GUEST)		+= sev-guest/
>   obj-$(CONFIG_INTEL_TDX_GUEST)	+= tdx-guest/
> +obj-$(CONFIG_ARM_CCA_GUEST)	+= arm-cca-guest/
> diff --git a/drivers/virt/coco/arm-cca-guest/Kconfig b/drivers/virt/coco/arm-cca-guest/Kconfig
> new file mode 100644
> index 000000000000..c4039c10dce2
> --- /dev/null
> +++ b/drivers/virt/coco/arm-cca-guest/Kconfig
> @@ -0,0 +1,11 @@
> +config ARM_CCA_GUEST
> +	tristate "Arm CCA Guest driver"
> +	depends on ARM64
> +	default m
> +	select TSM_REPORTS
> +	help
> +	  The driver provides userspace interface to request and
> +	  attestation report from the Realm Management Monitor(RMM).
> +
> +	  If you choose 'M' here, this module will be called
> +	  realm-guest.

This needs to be updated to arm-cca-guest.

Suzuki