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Message-Id: <20240819131924.372366-1-steven.price@arm.com>
Date: Mon, 19 Aug 2024 14:19:05 +0100
From: Steven Price <steven.price@....com>
To: kvm@...r.kernel.org,
kvmarm@...ts.linux.dev
Cc: Steven Price <steven.price@....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>,
Suzuki K Poulose <suzuki.poulose@....com>,
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>,
Gavin Shan <gshan@...hat.com>,
Shanker Donthineni <sdonthineni@...dia.com>,
Alper Gun <alpergun@...gle.com>
Subject: [PATCH v5 00/19] arm64: Support for running as a guest in Arm CCA
This series adds support for running Linux in a protected VM under the
Arm Confidential Compute Architecture (CCA). This has been updated
following the feedback from the v4 posting[1]. Thanks for the feedback!
Individual patches have a change log. But things to highlight:
* New RMM spec version[2] (v1.0-rel0-rc1). Note that this makes a
number of (small) breaking changes so you will need to update the RMM
and host too (see below).
* 'Borrowed' two commits by Will from the pKVM series which add a
dispatcher/hook for mem_encrypt and ioremap. These will hopefully
make it easier for CCA to live alongside pKVM.
* Reworked the code for handling protected/shared MMIO. The new RMM
spec adds a new state (RIPAS_IO - although that may get renamed),
which is currently unused, but will be used in a later version to
signify that a granule is backed by a protected hardware MMIO region.
Using this we can now identify whether the top bit should be set when
performing an ioremap (or similar).
The ABI to the RMM from a realm (the RSI) is based on the RMM
v1.0-rel0-rc1 specification[2]. Future RMM specifications after v1.0
will be backwards compatible so a guest using the v1.0 specification
(i.e. this series) will be able to run on future versions of the RMM
without modification.
This series is based on v6.11-rc1. It is also available as a git
repository:
https://gitlab.arm.com/linux-arm/linux-cca cca-guest/v5
As mentioned above the new RMM specification means that corresponding
changes need to be made in the RMM, at this time these changes are still
in review (see 'topics/rmm-1.0-rel0-rc1'). So you'll need to fetch the
changes[3] from the gerrit instance until they are pushed to the main
branch.
It has also been pointed out that some documentation would be a good
idea - I'm afraid it hasn't made this version, but I didn't want to hold
off posting for any longer.
The new version of the RMM also means you'll need to update the host
support, a v4 of the host changes will be posted soon, in the mean time
the code is available from git here:
https://gitlab.arm.com/linux-arm/linux-cca cca-host/v4
[1] https://lore.kernel.org/r/20240701095505.165383-1-steven.price%40arm.com
[2] https://developer.arm.com/-/cdn-downloads/permalink/PDF/Architectures/DEN0137_1.0-rel0-rc1_rmm-arch_external.pdf
[3] https://review.trustedfirmware.org/c/TF-RMM/tf-rmm/+/30485
Jean-Philippe Brucker (1):
firmware/psci: Add psci_early_test_conduit()
Sami Mujawar (1):
virt: arm-cca-guest: TSM_REPORT support for realms
Steven Price (6):
arm64: realm: Query IPA size from the RMM
arm64: Make the PHYS_MASK_SHIFT dynamic
arm64: Enforce bounce buffers for realm DMA
arm64: mm: Avoid TLBI when marking pages as valid
irqchip/gic-v3-its: Share ITS tables with a non-trusted hypervisor
irqchip/gic-v3-its: Rely on genpool alignment
Suzuki K Poulose (9):
arm64: rsi: Add RSI definitions
arm64: Detect if in a realm and set RIPAS RAM
arm64: rsi: Add support for checking whether an MMIO is protected
fixmap: Allow architecture overriding set_fixmap_io
fixmap: Pass down the full phys address for set_fixmap_io
arm64: Override set_fixmap_io
arm64: rsi: Map unprotected MMIO as decrypted
efi: arm64: Map Device with Prot Shared
arm64: Enable memory encrypt for Realms
Will Deacon (2):
arm64: mm: Add top-level dispatcher for internal mem_encrypt API
arm64: mm: Add confidential computing hook to ioremap_prot()
arch/arm64/Kconfig | 4 +
arch/arm64/include/asm/fixmap.h | 2 +
arch/arm64/include/asm/io.h | 12 +
arch/arm64/include/asm/mem_encrypt.h | 24 ++
arch/arm64/include/asm/pgtable-hwdef.h | 6 -
arch/arm64/include/asm/pgtable-prot.h | 4 +
arch/arm64/include/asm/pgtable.h | 10 +
arch/arm64/include/asm/rsi.h | 68 ++++++
arch/arm64/include/asm/rsi_cmds.h | 157 +++++++++++++
arch/arm64/include/asm/rsi_smc.h | 189 ++++++++++++++++
arch/arm64/include/asm/set_memory.h | 4 +
arch/arm64/kernel/Makefile | 3 +-
arch/arm64/kernel/efi.c | 12 +-
arch/arm64/kernel/rsi.c | 149 +++++++++++++
arch/arm64/kernel/setup.c | 8 +
arch/arm64/mm/Makefile | 2 +-
arch/arm64/mm/init.c | 10 +-
arch/arm64/mm/ioremap.c | 23 +-
arch/arm64/mm/mem_encrypt.c | 50 +++++
arch/arm64/mm/mmu.c | 17 ++
arch/arm64/mm/pageattr.c | 84 ++++++-
drivers/firmware/psci/psci.c | 25 +++
drivers/irqchip/irq-gic-v3-its.c | 142 +++++++++---
drivers/tty/serial/earlycon.c | 2 +-
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 | 211 ++++++++++++++++++
include/asm-generic/fixmap.h | 4 +-
include/linux/psci.h | 5 +
31 files changed, 1200 insertions(+), 43 deletions(-)
create mode 100644 arch/arm64/include/asm/mem_encrypt.h
create mode 100644 arch/arm64/include/asm/rsi.h
create mode 100644 arch/arm64/include/asm/rsi_cmds.h
create mode 100644 arch/arm64/include/asm/rsi_smc.h
create mode 100644 arch/arm64/kernel/rsi.c
create mode 100644 arch/arm64/mm/mem_encrypt.c
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
--
2.34.1
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