> -#define HCA_CAP_MR_PGSIZE_4K 1
> -#define HCA_CAP_MR_PGSIZE_64K 2
> -#define HCA_CAP_MR_PGSIZE_1M 4
> -#define HCA_CAP_MR_PGSIZE_16M 8
> +#define HCA_CAP_MR_PGSIZE_4K 0x80000000
> +#define HCA_CAP_MR_PGSIZE_64K 0x40000000
> +#define HCA_CAP_MR_PGSIZE_1M 0x20000000
> +#define HCA_CAP_MR_PGSIZE_16M 0x10000000
Not sure I understand what this has to do with things... is this an
unrelated fix?
> +static int ehca_is_mem_hugetlb(unsigned long addr, unsigned long size)
This is rather awful -- another call to get_user_pages() to iterate
over all the vmas...
I would suggest extending ib_umem_get() to check the vmas and adding a
member to struct ib_umem to say whether the memory is entirely covered
by hugetlb pages or not.
> + ret = ehca_is_mem_hugetlb(virt, length);
> + switch (ret) {
> + case 0: /* mem is not from hugetlb */
> + hwpage_size = PAGE_SIZE;
> + break;
> + case 1:
> + if (length <= EHCA_MR_PGSIZE4K
> + && PAGE_SIZE == EHCA_MR_PGSIZE4K)
> + hwpage_size = EHCA_MR_PGSIZE4K;
> + else if (length <= EHCA_MR_PGSIZE64K)
> + hwpage_size = EHCA_MR_PGSIZE64K;
> + else if (length <= EHCA_MR_PGSIZE1M)
> + hwpage_size = EHCA_MR_PGSIZE1M;
> + else
> + hwpage_size = EHCA_MR_PGSIZE16M;
> + break;
> + default: /* out of mem */
> + ib_mr = ERR_PTR(-ENOMEM);
> + goto reg_user_mr_exit1;
It seems like it would be better to just assume the memory is not from
a hugetlb is ehca_is_mem_hugetlb() fails its memory allocation and
fall back to the PAGE_SIZE case rather than failing entirely.
Also if someone runs a kernel with 64K pages on a machine where they
end up being simulated from 4K pages, do you have the same issue with
the hypervisor ganging together non-contiguous pages?
- R.
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