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SubjectRe: [PATCH v13 07/13] x86/sgx: Add data structures for tracking the EPC pages
On Mon, Aug 27, 2018 at 9:58 PM Jarkko Sakkinen
<jarkko.sakkinen@linux.intel.com> wrote:
>
> Add data structures to track Enclave Page Cache (EPC) pages. EPC is
> divided into multiple banks (1-N) of which addresses and sizes can be
> enumerated with CPUID by the OS.
>
> On NUMA systems a node can have at most bank. A bank can be at most part of
> two nodes. SGX supports both nodes with a single memory controller and also
> sub-cluster nodes with severals memory controllers on a single die.

> -#include <asm/sgx.h>
> -#include <asm/sgx_pr.h>
> #include <linux/freezer.h>
> #include <linux/highmem.h>
> #include <linux/kthread.h>
> +#include <linux/pagemap.h>
> #include <linux/ratelimit.h>
> #include <linux/sched/signal.h>
> +#include <linux/shmem_fs.h>
> #include <linux/slab.h>
> +#include <asm/sgx.h>
> +#include <asm/sgx_pr.h>

Squash issues?

> + va = ioremap_cache(addr, size);
> + if (!va)
> + return -ENOMEM;

I'm not sure this is a right API. Do we operate with memory? Does it
have I/O side effects?
If no, memremap() would be better to use.

--
With Best Regards,
Andy Shevchenko

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