[PATCH v6 0/5] KVM: arm64: Support for 2023 dpISA extensions

Mark Brown
2024-03-29T00:13:54Z

This series implements support for the 2023 dpISA extensions in KVM
guests, it was previously posted as part of a series with the host
support but that has now been merged so only the KVM portions remain.

Most of these extensions add only new instructions so the guest support
consists of adding the relevant ID registers, masking out other features
like the 2023 MTE extensions.

FEAT_FPMR introduces a new system register FPMR to the floating point
state which we enable guest access to and context switch when the ID
registers indicate that it is supported. Currently we implement
visibility for FPMR with a fpmr_visibility() function as for other
system registers, I will separately look into adding support for
specifying this in the struct sys_reg_desc.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
Changes in v6:
- Rebase onto v6.9-rc1.
- The host portions of the series were merged so only the KVM guest
support remains.
- Link to v5: https://lore.kernel.org/r/20240306-arm64-2023-dpisa-v5-0-c568edc8ed7f@kernel.org

Changes in v5:
- Rebase onto v6.8-rc3.
- Use u64 rather than unsigned long for storing FPMR.
- Temporarily drop KVM guest support due to issues with KVM being a
moving target.
- Link to v4: https://lore.kernel.org/r/20240122-arm64-2023-dpisa-v4-0-776e094861df@kernel.org

Changes in v4:
- Rebase onto v6.8-rc1.
- Move KVM support to the end of the series.
- Link to v3: https://lore.kernel.org/r/20231205-arm64-2023-dpisa-v3-0-dbcbcd867a7f@kernel.org

Changes in v3:
- Rebase onto v6.7-rc3.
- Hook up traps for FPMR in emulate-nested.c.
- Link to v2: https://lore.kernel.org/r/20231114-arm64-2023-dpisa-v2-0-47251894f6a8@kernel.org

Changes in v2:
- Rebase onto v6.7-rc1.
- Link to v1: https://lore.kernel.org/r/20231026-arm64-2023-dpisa-v1-0-8470dd989bb2@kernel.org

---
Mark Brown (5):
KVM: arm64: Share all userspace hardened thread data with the hypervisor
KVM: arm64: Add newly allocated ID registers to register descriptions
KVM: arm64: Support FEAT_FPMR for guests
KVM: arm64: selftests: Document feature registers added in 2023 extensions
KVM: arm64: selftests: Teach get-reg-list about FPMR

arch/arm64/include/asm/kvm_host.h | 6 ++++--
arch/arm64/include/asm/processor.h | 2 +-
arch/arm64/kvm/emulate-nested.c | 9 ++++++++
arch/arm64/kvm/fpsimd.c | 15 +++++++-------
arch/arm64/kvm/hyp/include/hyp/switch.h | 9 ++++++--
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 4 ++--
arch/arm64/kvm/sys_regs.c | 24 +++++++++++++++++++---
tools/testing/selftests/kvm/aarch64/get-reg-list.c | 11 ++++++++--
8 files changed, 60 insertions(+), 20 deletions(-)
---
base-commit: 4cece764965020c22cff7665b18a012006359095
change-id: 20231003-arm64-2023-dpisa-2f3d25746474

Best regards,
--
Mark Brown <broonie@kernel.org>