From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Will Deacon <will@kernel.org>
Cc: Janosch Frank <frankja@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Marc Zyngier <maz@kernel.org>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>, KVM <kvm@vger.kernel.org>,
Cornelia Huck <cohuck@redhat.com>,
David Hildenbrand <david@redhat.com>,
Thomas Huth <thuth@redhat.com>,
Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Andrea Arcangeli <aarcange@redhat.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Michael Mueller <mimu@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
linux-mm@kvack.org, kvm-ppc@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
mark.rutland@arm.com, qperret@google.com,
palmerdabbelt@google.com
Subject: Re: [PATCH 01/35] mm:gup/writeback: add callbacks for inaccessible pages
Date: Tue, 11 Feb 2020 12:43:13 +0100 [thread overview]
Message-ID: <05f1450e-230f-444d-1b3e-c0c50d089a93@de.ibm.com> (raw)
In-Reply-To: <20200211112611.GD8560@willie-the-truck>
On 11.02.20 12:26, Will Deacon wrote:
> On Mon, Feb 10, 2020 at 06:27:04PM +0100, Christian Borntraeger wrote:
>> CC Marc Zyngier for KVM on ARM. Marc, see below. Will there be any
>> use for this on KVM/ARM in the future?
>
> I can't speak for Marc, but I can say that we're interested in something
> like this for potentially isolating VMs from a KVM host in Android.
> However, we've currently been working on the assumption that the memory
> removed from the host won't usually be touched by the host (i.e. no
> KSM or swapping out), so all we'd probably want at the moment is to be
> able to return an error back from arch_make_page_accessible(). Its return
> code is ignored in this patch :/
>
> One thing I don't grok about the ultravisor encryption is how it avoids
> replay attacks when paging back in. For example, if the host is compromised
> and replaces the page contents with an old encrypted value. Are you storing
> per-page metadata somewhere to ensure "freshness" of the encrypted data?
Cant talk about the others, but on s390 the ultravisor stores counter,
tweak, address and hashing information. No replay or page exchange within
the guest is possible. (We can move the guest content to a different host
page though be using the export/import as this will revalidate the
correctness from the guest point of view)
next prev parent reply other threads:[~2020-02-11 11:43 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-07 11:39 [PATCH 00/35] KVM: s390: Add support for protected VMs Christian Borntraeger
2020-02-07 11:39 ` [PATCH 01/35] mm:gup/writeback: add callbacks for inaccessible pages Christian Borntraeger
2020-02-10 17:27 ` Christian Borntraeger
2020-02-11 11:26 ` Will Deacon
2020-02-11 11:43 ` Christian Borntraeger [this message]
2020-02-13 14:48 ` Christian Borntraeger
2020-02-18 16:02 ` Will Deacon
2020-02-13 19:56 ` Sean Christopherson
2020-02-13 20:13 ` Christian Borntraeger
2020-02-13 20:46 ` Sean Christopherson
2020-02-17 20:55 ` Tom Lendacky
2020-02-17 21:14 ` Christian Borntraeger
2020-02-10 18:17 ` David Hildenbrand
2020-02-10 18:28 ` Christian Borntraeger
2020-02-10 18:43 ` David Hildenbrand
2020-02-10 18:51 ` Christian Borntraeger
2020-02-18 3:36 ` Tian, Kevin
2020-02-18 6:44 ` Christian Borntraeger
2020-02-07 11:39 ` [PATCH 02/35] KVM: s390/interrupt: do not pin adapter interrupt pages Christian Borntraeger
2020-02-10 12:26 ` David Hildenbrand
2020-02-10 18:38 ` Christian Borntraeger
2020-02-10 19:33 ` David Hildenbrand
2020-02-11 9:23 ` [PATCH v2 RFC] " Christian Borntraeger
2020-02-12 11:52 ` Christian Borntraeger
2020-02-12 12:16 ` David Hildenbrand
2020-02-12 12:22 ` Christian Borntraeger
2020-02-12 12:47 ` David Hildenbrand
2020-02-12 12:39 ` Cornelia Huck
2020-02-12 12:44 ` Christian Borntraeger
2020-02-12 13:07 ` Cornelia Huck
2020-02-10 18:56 ` [PATCH 02/35] KVM: s390/interrupt: do not pin adapter interrupt Ulrich Weigand
2020-02-10 12:40 ` [PATCH 02/35] KVM: s390/interrupt: do not pin adapter interrupt pages David Hildenbrand
2020-02-07 11:39 ` [PATCH 05/35] s390/mm: provide memory management functions for protected KVM guests Christian Borntraeger
2020-02-12 13:42 ` Cornelia Huck
2020-02-13 7:43 ` Christian Borntraeger
2020-02-13 8:44 ` Cornelia Huck
2020-02-14 17:59 ` David Hildenbrand
2020-02-14 21:17 ` Christian Borntraeger
2020-02-07 11:39 ` [PATCH 06/35] s390/mm: add (non)secure page access exceptions handlers Christian Borntraeger
2020-02-14 18:05 ` David Hildenbrand
2020-02-14 19:59 ` Christian Borntraeger
2020-02-07 11:39 ` [PATCH 10/35] KVM: s390: protvirt: Secure memory is not mergeable Christian Borntraeger
2020-02-07 11:39 ` [PATCH 11/35] KVM: s390/mm: Make pages accessible before destroying the guest Christian Borntraeger
2020-02-14 18:40 ` David Hildenbrand
2020-02-07 11:39 ` [PATCH 21/35] KVM: s390/mm: handle guest unpin events Christian Borntraeger
2020-02-10 14:58 ` Thomas Huth
2020-02-11 13:21 ` Cornelia Huck
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