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Date:   Mon, 6 Jul 2020 21:46:26 -0700
From:   Sean Christopherson <sean.j.christopherson@intel.com>
To:     Matthew Wilcox <willy@infradead.org>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>, x86@kernel.org,
        linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-security-module@vger.kernel.org, linux-mm@kvack.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Jethro Beekman <jethro@fortanix.com>,
        Haitao Huang <haitao.huang@linux.intel.com>,
        Chunyang Hui <sanqian.hcy@antfin.com>,
        Jordan Hand <jorhand@linux.microsoft.com>,
        Nathaniel McCallum <npmccallum@redhat.com>,
        Seth Moore <sethmo@google.com>,
        Suresh Siddha <suresh.b.siddha@intel.com>,
        andriy.shevchenko@linux.intel.com, asapek@google.com, bp@alien8.de,
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        tglx@linutronix.de, yaozhangx@google.com
Subject: Re: [PATCH v34 11/24] x86/sgx: Add SGX enclave driver
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On Tue, Jul 07, 2020 at 05:39:04AM +0100, Matthew Wilcox wrote:
> although I think you have a simpler task.
> 
> 	XA_STATE(xas, ..., start_index);
> 
> 	for (;;) {
> 		struct page *page = xas_next(&xas);
> 
> 		if (!page || (~page->vm_max_prot_bits & vm_prot_bits))
> 			return -EACCES;
> 	}
> 
> 	return 0;
> 
> should do the trick, I think.

Ah, neato.  Thanks!