On Mon, 09 Oct 2023 19:26:01 -0500, Huang, Kai wrote:
@@ -332,6 +336,7 @@ void sgx_isolate_epc_pages(struct sgx_epc_lru_lists
*lru, size_t nr_to_scan,
* sgx_reclaim_epc_pages() - Reclaim EPC pages from the consumers
* @nr_to_scan: Number of EPC pages to scan for reclaim
On Tue, 17 Oct 2023 13:54:54 -0500, Michal Koutný wrote:
On Fri, Sep 22, 2023 at 08:06:55PM -0700, Haitao Huang
wrote:
+static void sgx_epc_cgroup_free(struct misc_cg *cg)
+{
+ struct sgx_epc_cgroup *epc_cg;
+
+ epc_cg = sgx_epc_cgroup_from_misc_cg(cg);
It should check for !epc
On Fri, Sep 22, 2023 at 08:06:55PM -0700, Haitao Huang
wrote:
> +static void sgx_epc_cgroup_free(struct misc_cg *cg)
> +{
> + struct sgx_epc_cgroup *epc_cg;
> +
> + epc_cg = sgx_epc_cgroup_from_misc_cg(cg);
It should check for !epc_cg since the misc controller implementation
in misc_cg_a
On Fri, 2023-09-22 at 20:06 -0700, Haitao Huang wrote:
> From: Kristen Carlson Accardi
>
> Implement support for cgroup control of SGX Enclave Page Cache (EPC)
> memory using the misc cgroup controller. EPC memory is independent
> from normal system memory, e.g. must be reserved at boot from RAM
> +
> +static inline struct sgx_epc_cgroup *sgx_epc_cgroup_from_misc_cg(struct
> misc_cg *cg)
> +{
> + if (cg)
> + return (struct sgx_epc_cgroup
> *)(cg->res[MISC_CG_RES_SGX_EPC].priv);
> +
> + return NULL;
> +}
> +
>
Is it good idea to allow passing a NULL @cg to this basi
> @@ -332,6 +336,7 @@ void sgx_isolate_epc_pages(struct sgx_epc_lru_lists *lru,
> size_t nr_to_scan,
> * sgx_reclaim_epc_pages() - Reclaim EPC pages from the consumers
> * @nr_to_scan: Number of EPC pages to scan for reclaim
> * @ignore_age: Reclaim a page even i
> +static inline struct sgx_epc_lru_lists *epc_cg_lru(struct sgx_epc_cgroup
> *epc_cg)
> +{
> + if (epc_cg)
> + return &epc_cg->lru;
> + return NULL;
> +}
>
It's legal to return NULL EPC cgroup for a given EPC page, i.e., when the
enclave isn't assigned to any cgroup. But .
> +/**
> + * sgx_epc_cgroup_lru_empty() - check if a cgroup tree has no pages on its
> lrus
> + * @root:root of the tree to check
> + *
> + * Return: %true if all cgroups under the specified root have empty LRU
> lists.
> + * Used to avoid livelocks due to a cgroup having a non-zero charge c
> ---
> arch/x86/Kconfig | 13 +
> arch/x86/kernel/cpu/sgx/Makefile | 1 +
> arch/x86/kernel/cpu/sgx/epc_cgroup.c | 415 +++
> arch/x86/kernel/cpu/sgx/epc_cgroup.h | 59
> arch/x86/kernel/cpu/sgx/main.c | 68 -
> arch/x86/kernel/
On Sat Sep 23, 2023 at 6:06 AM EEST, Haitao Huang wrote:
> From: Kristen Carlson Accardi
>
> Implement support for cgroup control of SGX Enclave Page Cache (EPC)
> memory using the misc cgroup controller. EPC memory is independent
> from normal system memory, e.g. must be reserved at boot from RAM
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