From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Weimer <fw@deneb.enyo.de>
Subject: Re: [PATCH RFC] mm: add MAP_EXCLUSIVE to create exclusive user mappings
Date: Sun, 27 Oct 2019 11:30:21 +0100
Message-ID: <87d0eieb0i.fsf@mid.deneb.enyo.de>
References: <1572171452-7958-1-git-send-email-rppt@kernel.org>
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In-Reply-To: <1572171452-7958-1-git-send-email-rppt@kernel.org> (Mike
        Rapoport's message of "Sun, 27 Oct 2019 12:17:31 +0200")
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To: Mike Rapoport <rppt@kernel.org>
Cc: linux-kernel@vger.kernel.org, Alexey Dobriyan <adobriyan@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, James Bottomley <jejb@linux.ibm.com>, Peter Zijlstra <peterz@infradead.org>, Steven Rostedt <rostedt@goodmis.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, linux-api@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, Mike Rapoport <rppt@linux.ibm.com>
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* Mike Rapoport:

> The patch below aims to allow applications to create mappins that have
> pages visible only to the owning process. Such mappings could be used to
> store secrets so that these secrets are not visible neither to other
> processes nor to the kernel.

How is this expected to interact with CRIU?

> I've only tested the basic functionality, the changes should be verified
> against THP/migration/compaction. Yet, I'd appreciate early feedback.

What are the expected semantics for VM migration?  Should it fail?