As observed during review the pKVM support for saving host SVE state is
broken if an asymmetric system has VLs larger than the maximum shared
VL, fix this by discovering then using the maximum VL for allocations
and using RDVL during the save/restore process.
Signed-off-by: Mark Brown <[email protected]>
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Mark Brown (4):
arm64/fpsimd: Introduce __bit_to_vl() helper
arm64/fpsimd: Discover maximum vector length implemented by any CPU
KVM: arm64: Fix FFR offset calculation for pKVM host state save and restore
KVM: arm64: Avoid underallocating storage for host SVE state
arch/arm64/include/asm/fpsimd.h | 17 +++++++++++++++
arch/arm64/include/asm/kvm_host.h | 2 +-
arch/arm64/include/asm/kvm_hyp.h | 3 ++-
arch/arm64/include/asm/kvm_pkvm.h | 2 +-
arch/arm64/kernel/fpsimd.c | 38 +++++++++++++++++++++++++++------
arch/arm64/kvm/hyp/fpsimd.S | 5 +++++
arch/arm64/kvm/hyp/include/hyp/switch.h | 2 +-
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 6 +++---
arch/arm64/kvm/hyp/nvhe/pkvm.c | 2 +-
arch/arm64/kvm/reset.c | 6 +++---
10 files changed, 65 insertions(+), 18 deletions(-)
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base-commit: afb91f5f8ad7af172d993a34fde1947892408f53
change-id: 20240604-kvm-arm64-fix-pkvm-sve-vl-13cd71fd7db0
Best regards,
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Mark Brown <[email protected]>