linux-kernel - Re: [PATCH v30 12/20] x86/sgx: Add a page reclaimer

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Message-ID: <20200522215245.GD25128@linux.intel.com>
Date:   Fri, 22 May 2020 14:52:45 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...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,
        linux-mm@...ck.org, Jethro Beekman <jethro@...tanix.com>,
        Jordan Hand <jorhand@...ux.microsoft.com>,
        Chunyang Hui <sanqian.hcy@...fin.com>,
        Seth Moore <sethmo@...gle.com>
Subject: Re: [PATCH v30 12/20] x86/sgx: Add a page reclaimer

On Fri, May 22, 2020 at 10:57:05PM +0300, Jarkko Sakkinen wrote:
> v31:
> * Unset SGX_ENCL_IOCTL in the error path of checking encl->flags in order
>   to prevent leaving it set and thus block any further ioctl calls.
> * Added missing cleanup_srcu_struct() call to sgx_encl_release().
> * Take encl->lock in sgx_encl_add_page() in order to prevent races with
>   the page reclaimer.
> * Fix a use-after-free bug from page reclaimer. Call kref_put() for the
>   encl->refcount only after putting enclave page back to the active page
>   list because it could be the last ref to the enclave.
> 
> I'm ready to send a new version of the patch set once there is a
> conclusion with the sigstruct vendor field.

Fire away, nothing pending on my end, the cgroup tests appear to be running
clean.