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SubjectRe: [PATCH v28 16/22] x86/sgx: Add a page reclaimer
On Wed, Mar 04, 2020 at 01:36:03AM +0200, Jarkko Sakkinen wrote:
> +static void sgx_reclaimer_write(struct sgx_epc_page *epc_page,
> + struct sgx_backing *backing)
> +{
> + struct sgx_encl_page *encl_page = epc_page->owner;
> + struct sgx_encl *encl = encl_page->encl;
> + struct sgx_backing secs_backing;
> + int ret;
> +
> + mutex_lock(&encl->lock);
> +
> + if (atomic_read(&encl->flags) & SGX_ENCL_DEAD) {
> + ret = __eremove(sgx_epc_addr(epc_page));
> + WARN(ret, "EREMOVE returned %d\n", ret);

This should use ENCLS_WARN().

> + } else {
> + sgx_encl_ewb(epc_page, backing);
> + }
> +
> + encl_page->epc_page = NULL;
> + encl->secs_child_cnt--;
> +
> + if (!encl->secs_child_cnt) {
> + if (atomic_read(&encl->flags) & SGX_ENCL_DEAD) {
> + sgx_free_page(encl->secs.epc_page);
> + encl->secs.epc_page = NULL;
> + } else if (atomic_read(&encl->flags) & SGX_ENCL_INITIALIZED) {
> + ret = sgx_encl_get_backing(encl, PFN_DOWN(encl->size),
> + &secs_backing);
> + if (ret)
> + goto out;
> +
> + sgx_encl_ewb(encl->secs.epc_page, &secs_backing);
> +
> + sgx_free_page(encl->secs.epc_page);
> + encl->secs.epc_page = NULL;
> +
> + sgx_encl_put_backing(&secs_backing, true);
> + }
> + }
> +
> +out:
> + mutex_unlock(&encl->lock);
> +}

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