linux-kernel - Re: [PATCH 0/3] arm64: realm: Add support for encrypted data from firmware

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Message-ID: <3827D79E-867A-4B3C-99F7-E5B459D04AEE@arm.com>
Date: Tue, 17 Jun 2025 09:20:45 +0000
From: Sami Mujawar <Sami.Mujawar@....com>
To: Suzuki Poulose <Suzuki.Poulose@....com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
CC: "will@...nel.org" <will@...nel.org>, Catalin Marinas
	<Catalin.Marinas@....com>, "aneesh.kumar@...nel.org"
	<aneesh.kumar@...nel.org>, Steven Price <Steven.Price@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Sudeep Holla
	<Sudeep.Holla@....com>
Subject: Re: [PATCH 0/3] arm64: realm: Add support for encrypted data from
 firmware

For this series.

Tested-by: Sami Mujawar <sami.mujawar@....com>

Thanks.

Regards,

Sami Mujawar


On 16/06/2025, 12:15, "Suzuki K Poulose" <suzuki.poulose@....com <mailto:suzuki.poulose@....com>> wrote:


On 13/06/2025 12:11, Suzuki K Poulose wrote:
> Confidential compute firmware may provide secret data via reserved memory regions
> (e.g., ACPI CCEL, EFI Coco secret area). These must be ioremap'ed() as encrypted.
> As of now, realm only maps "trusted devices" (RIPAS = RSI_RIPAS_DEV) as encrypted.
> This series adds support for mapping areas that are protected
> (i.e., RIPAS = RSI_RIPAS_RAM) as encrypted. Also, extrapolating that, we can map
> anything that is not RIPAS_EMPTY as protected, as it is guaranteed to be "protected".
> 
> With this in place, we can naturally map any firmware provided area based on the
> RIPAS value. If the firmware provides a shared region (not trusted), it must have
> set the RIPAS accordingly, before placing the data, as the transition is always
> destructive.
> 
> Also enables the EFI Coco secret area support and Confidential Compute Event
> Log (CCEL) for arm64.
> 


A branch with the patches is also available here:


git@....gitlab.arm.com <mailto:git@....gitlab.arm.com>:linux-arm/linux-cca.git cca-guest/coco-secret/v1




Suzuki




> 
> Suzuki K Poulose (3):
> arm64: realm: ioremap: Allow mapping memory as encrypted
> arm64: Enable EFI secret area Securityfs support
> arm64: acpi: Enable ACPI CCEL support
> 
> arch/arm64/include/asm/io.h | 6 +++++-
> arch/arm64/include/asm/rsi.h | 2 +-
> arch/arm64/kernel/acpi.c | 5 +++++
> arch/arm64/kernel/rsi.c | 26 ++++++++++++++++++++++----
> drivers/virt/coco/efi_secret/Kconfig | 2 +-
> 5 files changed, 34 insertions(+), 7 deletions(-)
>