linux-kernel - Re: [PATCH v30 09/20] mm: Introduce vm_ops->may

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Message-ID: <20200531231227.GA236202@linux.intel.com>
Date:   Mon, 1 Jun 2020 02:12:27 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        sean.j.christopherson@...el.com, nhorman@...hat.com,
        npmccallum@...hat.com, haitao.huang@...el.com,
        andriy.shevchenko@...ux.intel.com, tglx@...utronix.de,
        kai.svahn@...el.com, bp@...en8.de, josh@...htriplett.org,
        luto@...nel.org, kai.huang@...el.com, rientjes@...gle.com,
        cedric.xing@...el.com, puiterwijk@...hat.com,
        Jethro Beekman <jethro@...tanix.com>
Subject: Re: [PATCH v30 09/20] mm: Introduce vm_ops->may_mprotect()

On Fri, May 29, 2020 at 11:28:56AM -0700, Dave Hansen wrote:
> On 5/14/20 5:43 PM, Jarkko Sakkinen wrote:
> > From: Sean Christopherson <sean.j.christopherson@...el.com>
> > 
> > Add vm_ops()->may_mprotect() to check additional constrains set by a
> > subsystem for a mprotect() call.
> 
> This changelog needs some more detail about why this is needed.  It
> would also be nice to include thought about what else it could get used
> for and what subsystems can expect by doing this and what the mm core is
> expected to do.

Point taken. I added a description on how it is used.

/Jarkko