On Fri, Aug 09, 2019 at 05:30:51PM -0700, Sean Christopherson wrote:
> Manually align ELRANGE now that the kernel doesn't automatically do so
> for SGX mappings. To guarantee mmap() returns a region that can be
> naturally aligned, temporarily map 2x the enclave size and do fancy
> arithmetic to naturally align the base.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Thank you.
I fine-tuned the calculations a bit:
area = mmap(NULL, secs->size * 2, PROT_NONE, MAP_SHARED, dev_fd, 0);
if (area == MAP_FAILED) {
perror("mmap");
return false;
}
secs->base = ((uint64_t)area + secs->size - 1) & ~(secs->size - 1);
munmap(area, secs->base - (uint64_t)area);
munmap((void *)(secs->base + secs->size),
(uint64_t)area + secs->size - secs->base);
/Jarkko
