linux-kernel - Re: [PATCH v2 2/2] x86/sgx: account backing pages

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Message-ID: <YeIb2eeJ8H5l6omR@iki.fi>
Date:   Sat, 15 Jan 2022 02:56:57 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Kristen Carlson Accardi <kristen@...ux.intel.com>,
        linux-sgx@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] x86/sgx: account backing pages

On Fri, Jan 14, 2022 at 04:16:41PM -0800, Dave Hansen wrote:
> On 1/14/22 3:57 PM, Jarkko Sakkinen wrote:
> > Would it be a too big tretch to add these and make the whole scheme
> > fully legit? Does not sound like an extremely huge stretch and there is now
> > a full cycle amount of time make it happen before 5.18 merge window.
> 
> No, it's not a big stretch.  If anyone wants it for 5.18 (or whatever)
> just send the patch.

Fixing this to work with the current mainline is first and foremost
needed:

https://lore.kernel.org/linux-sgx/YeHqW8AaQ3HZZoQx@iki.fi/T/#t

With a fixeed version of that, wouldn't it be then just matter of calling
shmem_getpage() with SGX_NOALLOC to check the state of the file in both
calls?

/Jarkko