linux-kernel - Re: [PATCH v2 1/6] x86/sgx: Provide indication of life-cycle of EPC pages

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Message-ID: <b167addc-aa6b-d844-6d77-9efbd229b16d@intel.com>
Date:   Mon, 19 Jul 2021 11:28:09 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Tony Luck <tony.luck@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...el.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/6] x86/sgx: Provide indication of life-cycle of EPC
 pages

On 7/19/21 11:20 AM, Tony Luck wrote:
> 1) Change the type of "owner" to "void *" (it can have other types
>    besides "struct sgx_encl_page *).

I see:

static int __sgx_vepc_fault(struct sgx_vepc *vepc,
{
...
        epc_page = sgx_alloc_epc_page(vepc, false);

where sgx_alloc_epc_page() sets page->owner=vepc.  But, I don't see a
*reader* anywhere.  Do we actually use that vepc anywhere?