9.103 nvmm_capability ¶

struct nvmm_caps {
    uint32_t version;
    uint32_t state_size;
    uint32_t max_machines;
    uint32_t max_vcpus;
    uint64_t max_ram;
};

int nvmm_capability(struct nvmm_caps *caps);

This syscall fetches details about the NVMM implementation that the kernel exposes to userland. version is always 2 for Ironclad, but should be checked as to future proof/portability.

This syscall returns 0 on success or -1 on failure, with the errno:

EFAULT

The passed buffers were pointing to invalid memory.

ENOTSUPP

The current configuration doesn’t support NVMM.