| From: |
| Marc Zyngier <maz-AT-kernel.org> |
| To: |
| kvmarm-AT-lists.linux.dev, linux-arm-kernel-AT-lists.infradead.org, kvm-AT-vger.kernel.org |
| Subject: |
| [PATCH 0/7] KVM: arm64: Add support for FP8 |
| Date: |
| Mon, 08 Jul 2024 16:44:31 +0100 |
| Message-ID: |
| <20240708154438.1218186-1-maz@kernel.org> |
| Cc: |
| James Morse <james.morse-AT-arm.com>, Suzuki K Poulose <suzuki.poulose-AT-arm.com>, Oliver Upton <oliver.upton-AT-linux.dev>, Zenghui Yu <yuzenghui-AT-huawei.com>, Fuad Tabba <tabba-AT-google.com>, Joey Gouly <joey.gouly-AT-arm.com>, Mark Brown <broonie-AT-kernel.org> |
| Archive-link: |
| Article |
Although FP8 support was merged in 6.9, the KVM side was dropped, with
no sign of it being picked up again. Given that its absence is getting
in the way of NV upstreaming (HCRX_EL2 needs fleshing out), here's a
small series addressing it.
The support is following the save/restore model established for the
rest of the FP code, with FPMR being tied to it. The sole additions
are the handling of traps in a nested context, and the corresponding
ID registers being made writable. As an extra cleanup, SVCR and FPMR
are moved into the sysreg array.
Patches are on top of kvmarm/next, as this would otherwise majorly
conflict. Note that this is compile-tested only, as I have no access
to FP8 HW or model (and running NV in a model is not something I wish
to entertain ever again).
Also, this is *not* 6.11 material. 6.12 if we're lucky.
Marc Zyngier (7):
KVM: arm64: Move SVCR into the sysreg array
KVM: arm64: Move FPMR into the sysreg array
KVM: arm64: Add save/restore support for FPMR
KVM: arm64: Honor trap routing for FPMR
KVM: arm64: Expose ID_AA64FPFR0_EL1 as a writable ID reg
KVM: arm64: Enable FP8 support when available and configured
KVM: arm64: Expose ID_AA64PFR2_EL1 to userspace and guests
arch/arm64/include/asm/kvm_host.h | 16 ++++++++++--
arch/arm64/kvm/emulate-nested.c | 8 ++++++
arch/arm64/kvm/fpsimd.c | 5 ++--
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 4 +++
arch/arm64/kvm/hyp/nvhe/switch.c | 10 +++++++
arch/arm64/kvm/hyp/vhe/switch.c | 4 +++
arch/arm64/kvm/sys_regs.c | 42 +++++++++++++++++++++++++++---
7 files changed, 82 insertions(+), 7 deletions(-)
--
2.39.2
