[nvidia_unstable-10.1] Handle KVM_CAP_ARM_RME ABI change between kernel versions #6
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The KVM_CAP_ARM_RME capability number changed between Linux kernel versions 6.16 and 6.17 (from 243 to 244). This change adds runtime detection of the host kernel version to ensure QEMU remains compatible with both kernel versions during the transition period. The implementation: - Defaults to KVM_CAP_ARM_RME (244) from the updated headers - Detects kernel 6.16 at runtime and uses the previous value (243) - Applies the correct capability number to all RME-related ioctls This allows the same QEMU binary to work correctly on hosts running either kernel version. Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com> Signed-off-by: Ian May <ianm@nvidia.com>
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I confirmed all the kvm_vm_enable_cap using KVM_CAP_ARM_RME have been converted to use the variable instead. The logic for kernel detection looks good.
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NathanChenNVIDIA
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Dec 5, 2025
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Acked-by: Nathan Chen nathanc@nvidia.com
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Merged, closing PR. |
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The KVM_CAP_ARM_RME capability number changed between Linux kernel versions 6.16 and 6.17 (from 243 to 244). This change adds runtime detection of the host kernel version to ensure QEMU remains compatible with both kernel versions during the transition period.
The implementation:
This allows the same QEMU binary to work correctly on hosts running either kernel version.
Testing was successful on CCA hardware with both the 6.16 and 6.17 kernel.