From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: DANGER WILL ROBINSON, DANGER
Date: Mon, 9 Sep 2019 19:00:07 +0200
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To: Jerome Glisse <jglisse@redhat.com>, Mircea CIRJALIU - MELIU <mcirjaliu@bitdefender.com>
Cc: Tamas K Lengyel <tamas@tklengyel.com>, Weijiang Yang <weijiang.yang@intel.com>, Yu C <yu.c.zhang@intel.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>, Jan Kiszka <jan.kiszka@siemens.com>, =?UTF-8?Q?Samuel_Laur=c3=a9n?= <samuel.lauren@iki.fi>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Matthew Wilcox <willy@infradead.org>, "virtualization@lists.linux-foundation.org" <virtualization@lists.linux-foundation.org>, =?UTF-8?Q?Adalbert_Laz=c4=83r?= <alazar@bitdefender.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Patrick Colp <patrick.colp@oracle.com>, Mathieu Tarral <mathieu.tarral@protonmail.com>, Stefan Hajnoczi <stefanha@redhat.com>, =?UTF-8?Q?Mihai_Don=c8=9bu?= <mdontu@bitdefender.com>
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On 05/09/19 20:09, Jerome Glisse wrote:
> Not sure i understand, you are saying that the solution i outline above
> does not work ? If so then i think you are wrong, in the above solution
> the importing process mmap a device file and the resulting vma is then
> populated using insert_pfn() and constantly keep synchronize with the
> target process through mirroring which means that you never have to look
> at the struct page ... you can mirror any kind of memory from the remote
> process.

If insert_pfn in turn calls MMU notifiers for the target VMA (which
would be the KVM MMU notifier), then that would work.  Though I guess it
would be possible to call MMU notifier update callbacks around the call
to insert_pfn.

Paolo