Re: [PATCH v28 16/22] x86/sgx: Add a page reclaimer

[Sean Christopherson <sean.j.christopherson@intel.com>]

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);
> +}