[kvm-unit-tests PATCH 00/33] Support for Arm Confidential Compute Architecture

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This series adds support for running the kvm-unit-tests in the Arm CCA reference
software architecture.

The changes involve enlightening the boot/setup code with the Realm Service Interface
(RSI). The series also includes new test cases that exercise the RSI calls.

Currently we only support "kvmtool" as the VMM for running Realms. There was
an attempt to add support for running the test scripts using with kvmtool here [1],
which hasn't progressed. It would be good to have that resolved, so that we can
run all the tests without manually specifying the commandlines for each run.

For the purposes of running the Realm specific tests, we have added a "temporary"
script "run-realm-tests" until the kvmtool support is added. We do not expect
this to be merged.

Base Realm Support

Realm IPA Space
When running on in Realm world, the (Guest) Physical Address - aka Intermediate
Physical Address (IPA) in Arm terminology - space of the VM is split into two halves,
protected (lower half) and un-protected (upper half). A protected IPA will
always map pages in the "realm world" and  the contents are not accessible to
the host. An unprotected IPA on the other hand can be mapped to page in the
"normal world" and thus shared with the host. All host emulated MMIO ranges must
be in unprotected IPA space.

Realm can query the Realm Management Monitor for the configuration via RSI call
(RSI_REALM_CONFIG) and identify the "boundary" of the "IPA" split.

As far as the hyp/VMM is concerned, there is only one "IPA space" (the lower
half) of memory map. The "upper half" is "unprotected alias" of the memory map.

In the guest, this is achieved by "treating the MSB (1 << (IPA_WIDTH - 1))" as
a protection attribute (we call it - PTE_NS_SHARED), where the Realm applies this
to any address, it thinks is acccessed/managed by host (e.g., MMIO, shared pages).
Given that this is runtime variable (but fixed for a given Realm), uses a
variable to track the value.

All I/O regions are marked as "shared". Care is taken to ensure I/O access (uart)
with MMU off uses the "Unprotected Physical address".

Realm IPA State
Additionally, each page (4K) in the protected IPA space has a state associated
(Realm IPA State - RIPAS) with it. It is either of :

Any IPA backed by RAM, must be marked as RIPAS_RAM before an access is made to
it. The hypervisor/VMM does this for the initial image loaded into the Realm
memory before the Realm starts execution. Given the kvm-unit-test flat files do
not contain a metadata header (e.g., like the arm64 Linux kernel Image),
indicating the "actual image size in memory", the VMM cannot transition the
area towards the end of the image (e.g., bss, stack) which are accessed very
early during boot. Thus the early boot assembly code will mark the area upto
the stack as RAM.

Once we land in the C code, we mark target relocation area for FDT and
initrd as RIPAS_RAM. At this point, we can scan the FDT and mark all RAM memory
blocks as RIPAS_RAM.

TODO: It would be good to add an image header to the flat files indicating the
size, which can take the burden off doing the early assembly boot code RSI calls.

Shared Memory support
Given the "default" memory of a VM is not accessible to host, we add new page
alloc/free routines for "memory shared" with the host. e.g., GICv3-ITS must use
shared pages for ITS emulation.

RSI Test suites
There are new testcases added to exercise the RSI interfaces and the RMM flows.

Attestation and measurement services related RSI tests require parsing tokens
and claims returned by the RMM. This is achieved with the help of QCBOR library
[2], which is added as a submodule to the project. We have also added a wrapper
library - libtokenverifier - around the QCBOR to parse the tokens according to
the RMM specifications.

Running Arm CCA Stack

See more details on Arm CCA and how to build/run the entire stack here[0]
The easiest way to run the Arm CCA stack is using shrinkwrap and the details
are available in [0].

The patches are also available here :

 https://gitlab.arm.com/linux-arm/kvm-unit-tests-cca cca/v1

Changes since rfc:
  [ https://lkml.kernel.org/r/20230127114108.10025-1-joey.gouly@xxxxxxx ]
  - Add support for RMM-v1.0-EAC5, changes to RSI ABIs
  - Some hardening checks (FDT overlapping the BSS sections)
  - Selftest for memory stress
  - Enable PMU/SVE tests for Realms

 [0] https://lkml.kernel.org/r/20240412084056.1733704-1-steven.price@xxxxxxx
 [1] https://lkml.kernel.org/r/20210702163122.96110-1-alexandru.elisei@xxxxxxx
 [2] https://github.com/laurencelundblade/QCBOR

Alexandru Elisei (3):
  arm64: Expand SMCCC arguments and return values
  arm: selftest: realm: skip pabt test when running in a realm
  NOT-FOR-MERGING: add run-realm-tests

Djordje Kovacevic (1):
  arm: realm: Add tests for in realm SEA

Gareth Stockwell (1):
  arm: realm: add hvc and RSI_HOST_CALL tests

Jean-Philippe Brucker (1):
  arm: Move io_init after vm initialization

Joey Gouly (10):
  arm: Make physical address mask dynamic
  arm64: Introduce NS_SHARED PTE attribute
  arm: realm: Add RSI interface header
  arm: realm: Make uart available before MMU is enabled
  arm: realm: Add RSI version test
  arm64: add ESR_ELx EC.SVE
  arm64: enable SVE at startup
  arm64: selftest: add realm SVE VL test
  lib/alloc_page: Add shared page allocation support
  arm: Add memtest support

Mate Toth-Pal (2):
  arm: Add a library to verify tokens using the QCBOR library
  arm: realm: Add Realm attestation tests

Subhasish Ghosh (1):
  arm: realm: Add test for FPU/SIMD context save/restore

Suzuki K Poulose (14):
  arm: Add necessary header files in asm/pgtable.h
  arm: Detect FDT overlap with uninitialised data
  arm: realm: Realm initialisation
  arm: realm: Add support for changing the state of memory
  arm: realm: Set RIPAS state for RAM
  arm: realm: Early memory setup
  arm: gic-v3-its: Use shared pages wherever needed
  arm: realm: Enable memory encryption
  qcbor: Add QCBOR as a submodule
  arm: Add build steps for QCBOR library
  arm: realm: add RSI interface for attestation measurements
  arm: realm: Add helpers to decode RSI return codes
  arm: realm: Add Realm attestation tests
  arm: realm: Add a test for shared memory

 .gitmodules                         |    3 +
 arm/Makefile.arm64                  |   25 +-
 arm/cstart.S                        |   49 +-
 arm/cstart64.S                      |  154 +++-
 arm/fpu.c                           |  424 +++++++++
 arm/realm-attest.c                  | 1251 +++++++++++++++++++++++++++
 arm/realm-ns-memory.c               |   86 ++
 arm/realm-rsi.c                     |  159 ++++
 arm/realm-sea.c                     |  143 +++
 arm/run-realm-tests                 |  112 +++
 arm/selftest.c                      |  138 ++-
 arm/unittests.cfg                   |   96 +-
 lib/alloc_page.c                    |   20 +-
 lib/alloc_page.h                    |   24 +
 lib/arm/asm/arm-smccc.h             |   44 +
 lib/arm/asm/io.h                    |    6 +
 lib/arm/asm/pgtable.h               |    9 +
 lib/arm/asm/psci.h                  |   13 +-
 lib/arm/asm/rsi.h                   |   21 +
 lib/arm/asm/sve-vl-test.h           |    9 +
 lib/arm/gic-v3.c                    |    6 +-
 lib/arm/io.c                        |   24 +-
 lib/arm/mmu.c                       |   80 +-
 lib/arm/psci.c                      |   19 +-
 lib/arm/setup.c                     |   26 +-
 lib/arm64/asm/arm-smccc.h           |    6 +
 lib/arm64/asm/esr.h                 |    1 +
 lib/arm64/asm/io.h                  |    6 +
 lib/arm64/asm/pgtable-hwdef.h       |    6 -
 lib/arm64/asm/pgtable.h             |   20 +
 lib/arm64/asm/processor.h           |   34 +
 lib/arm64/asm/rsi.h                 |   89 ++
 lib/arm64/asm/smc-rsi.h             |  173 ++++
 lib/arm64/asm/sve-vl-test.h         |   28 +
 lib/arm64/asm/sysreg.h              |    7 +
 lib/arm64/gic-v3-its.c              |    6 +-
 lib/arm64/processor.c               |    1 +
 lib/arm64/rsi.c                     |  188 ++++
 lib/asm-generic/io.h                |   12 +
 lib/libcflat.h                      |    1 +
 lib/qcbor                           |    1 +
 lib/token_verifier/attest_defines.h |   50 ++
 lib/token_verifier/token_dumper.c   |  157 ++++
 lib/token_verifier/token_dumper.h   |   15 +
 lib/token_verifier/token_verifier.c |  591 +++++++++++++
 lib/token_verifier/token_verifier.h |   77 ++
 46 files changed, 4355 insertions(+), 55 deletions(-)
 create mode 100644 .gitmodules
 create mode 100644 arm/fpu.c
 create mode 100644 arm/realm-attest.c
 create mode 100644 arm/realm-ns-memory.c
 create mode 100644 arm/realm-rsi.c
 create mode 100644 arm/realm-sea.c
 create mode 100755 arm/run-realm-tests
 create mode 100644 lib/arm/asm/arm-smccc.h
 create mode 100644 lib/arm/asm/rsi.h
 create mode 100644 lib/arm/asm/sve-vl-test.h
 create mode 100644 lib/arm64/asm/arm-smccc.h
 create mode 100644 lib/arm64/asm/rsi.h
 create mode 100644 lib/arm64/asm/smc-rsi.h
 create mode 100644 lib/arm64/asm/sve-vl-test.h
 create mode 100644 lib/arm64/rsi.c
 create mode 160000 lib/qcbor
 create mode 100644 lib/token_verifier/attest_defines.h
 create mode 100644 lib/token_verifier/token_dumper.c
 create mode 100644 lib/token_verifier/token_dumper.h
 create mode 100644 lib/token_verifier/token_verifier.c
 create mode 100644 lib/token_verifier/token_verifier.h


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