Hi Suzuki, On Fri, Apr 12, 2024 at 11:33:35AM +0100, Suzuki K Poulose wrote: > 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 : > RIPAS_EMPTY > RIPAS_RAM > > 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 Thanks for the update! I'll go through the series one by one in the coming weeks. Just curious one thing - do you guys wish to add Realm tests to the kvm-unit-test package, but not to kselftests? Thanks, Itaru. > > -- > 2.34.1 >
