From: David Hildenbrand <david@redhat.com>
To: Fuad Tabba <tabba@google.com>
Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, pbonzini@redhat.com,
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yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org,
will@kernel.org, qperret@google.com, keirf@google.com
Subject: Re: [RFC PATCH v1 00/26] KVM: Restricted mapping of guest_memfd at the host and pKVM/arm64 support
Date: Wed, 28 Feb 2024 11:12:18 +0100 [thread overview]
Message-ID: <0951868c-911d-4879-bc79-14b5d3959462@redhat.com> (raw)
In-Reply-To: <CA+EHjTxBOs3M7DNeUfq9EfpZ8wSw5Uh6SOr_fG_9V=xjTH2S_Q@mail.gmail.com>
>> So you don't need any guest_memfd games to protect from that -- and one
>> doesn't have to travel back in time to have memory that isn't
>> swappable/migratable and only comes in one page size.
>>
>> [I'm not up-to-date which obscure corner-cases CCA requirement the s390x
>> implementation cannot fulfill -- like replacing pages in page tables and
>> such; I suspect pKVM also cannot cover all these corner-cases]
>
> Thanks for this. I'll do some more reading on how things work with s390x.
>
> Right, and of course, one key difference of course is that pKVM
> doesn't encrypt anything, and only relies on stage-2 protection to
> protect the guest.
I don't remember what exactly s390x does, but I recall that it might
only encrypt the memory content as it transitions a page from secure to
non-secure.
Something like that could also be implemented using pKVM (unless I am
missing something), but it might not be that trivial, of course :)
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2024-02-28 10:12 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-22 16:10 [RFC PATCH v1 00/26] KVM: Restricted mapping of guest_memfd at the host and pKVM/arm64 support Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 01/26] KVM: Split KVM memory attributes into user and kernel attributes Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 02/26] KVM: Introduce kvm_gmem_get_pfn_locked(), which retains the folio lock Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 03/26] KVM: Add restricted support for mapping guestmem by the host Fuad Tabba
2024-02-22 16:28 ` David Hildenbrand
2024-02-26 8:58 ` Fuad Tabba
2024-02-26 9:57 ` David Hildenbrand
2024-02-26 17:30 ` Fuad Tabba
2024-02-27 7:40 ` David Hildenbrand
2024-02-22 16:10 ` [RFC PATCH v1 04/26] KVM: Don't allow private attribute to be set if mapped by host Fuad Tabba
2024-04-17 23:27 ` Sean Christopherson
2024-04-18 10:54 ` David Hildenbrand
2024-02-22 16:10 ` [RFC PATCH v1 05/26] KVM: Don't allow private attribute to be removed for unmappable memory Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 06/26] KVM: Implement kvm_(read|/write)_guest_page for private memory slots Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 07/26] KVM: arm64: Turn llist of pinned pages into an rb-tree Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 08/26] KVM: arm64: Implement MEM_RELINQUISH SMCCC hypercall Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 09/26] KVM: arm64: Strictly check page type in MEM_RELINQUISH hypercall Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 10/26] KVM: arm64: Avoid unnecessary unmap walk " Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 11/26] KVM: arm64: Add initial support for KVM_CAP_EXIT_HYPERCALL Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 12/26] KVM: arm64: Allow userspace to receive SHARE and UNSHARE notifications Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 13/26] KVM: arm64: Create hypercall return handler Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 14/26] KVM: arm64: Refactor code around handling return from host to guest Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 15/26] KVM: arm64: Rename kvm_pinned_page to kvm_guest_page Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 16/26] KVM: arm64: Add a field to indicate whether the guest page was pinned Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 17/26] KVM: arm64: Do not allow changes to private memory slots Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 18/26] KVM: arm64: Skip VMA checks for slots without userspace address Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 19/26] KVM: arm64: Handle guest_memfd()-backed guest page faults Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 20/26] KVM: arm64: Track sharing of memory from protected guest to host Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 21/26] KVM: arm64: Mark a protected VM's memory as unmappable at initialization Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 22/26] KVM: arm64: Handle unshare on way back to guest entry rather than exit Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 23/26] KVM: arm64: Check that host unmaps memory unshared by guest Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 24/26] KVM: arm64: Add handlers for kvm_arch_*_set_memory_attributes() Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 25/26] KVM: arm64: Enable private memory support when pKVM is enabled Fuad Tabba
2024-02-22 16:10 ` [RFC PATCH v1 26/26] KVM: arm64: Enable private memory kconfig for arm64 Fuad Tabba
2024-02-22 23:43 ` [RFC PATCH v1 00/26] KVM: Restricted mapping of guest_memfd at the host and pKVM/arm64 support Elliot Berman
2024-02-23 0:35 ` folio_mmapped Matthew Wilcox
2024-02-26 9:28 ` folio_mmapped David Hildenbrand
2024-02-26 21:14 ` folio_mmapped Elliot Berman
2024-02-27 14:59 ` folio_mmapped David Hildenbrand
2024-02-28 10:48 ` folio_mmapped Quentin Perret
2024-02-28 11:11 ` folio_mmapped David Hildenbrand
2024-02-28 12:44 ` folio_mmapped Quentin Perret
2024-02-28 13:00 ` folio_mmapped David Hildenbrand
2024-02-28 13:34 ` folio_mmapped Quentin Perret
2024-02-28 18:43 ` folio_mmapped Elliot Berman
2024-02-28 18:51 ` Quentin Perret
2024-02-29 10:04 ` folio_mmapped David Hildenbrand
2024-02-29 19:01 ` folio_mmapped Fuad Tabba
2024-03-01 0:40 ` folio_mmapped Elliot Berman
2024-03-01 11:16 ` folio_mmapped David Hildenbrand
2024-03-04 12:53 ` folio_mmapped Quentin Perret
2024-03-04 20:22 ` folio_mmapped David Hildenbrand
2024-03-01 11:06 ` folio_mmapped David Hildenbrand
2024-03-04 12:36 ` folio_mmapped Quentin Perret
2024-03-04 19:04 ` folio_mmapped Sean Christopherson
2024-03-04 20:17 ` folio_mmapped David Hildenbrand
2024-03-04 21:43 ` folio_mmapped Elliot Berman
2024-03-04 21:58 ` folio_mmapped David Hildenbrand
2024-03-19 9:47 ` folio_mmapped Quentin Perret
2024-03-19 9:54 ` folio_mmapped David Hildenbrand
2024-03-18 17:06 ` folio_mmapped Vishal Annapurve
2024-03-18 22:02 ` folio_mmapped David Hildenbrand
2024-03-18 23:07 ` folio_mmapped Vishal Annapurve
2024-03-19 0:10 ` folio_mmapped Sean Christopherson
2024-03-19 10:26 ` folio_mmapped David Hildenbrand
2024-03-19 13:19 ` folio_mmapped David Hildenbrand
2024-03-19 14:31 ` folio_mmapped Will Deacon
2024-03-19 23:54 ` folio_mmapped Elliot Berman
2024-03-22 16:36 ` Will Deacon
2024-03-22 18:46 ` Elliot Berman
2024-03-27 19:31 ` Will Deacon
2024-03-22 17:52 ` folio_mmapped David Hildenbrand
2024-03-22 21:21 ` folio_mmapped David Hildenbrand
2024-03-26 22:04 ` folio_mmapped Elliot Berman
2024-03-27 17:50 ` folio_mmapped David Hildenbrand
2024-03-27 19:34 ` folio_mmapped Will Deacon
2024-03-28 9:06 ` folio_mmapped David Hildenbrand
2024-03-28 10:10 ` folio_mmapped Quentin Perret
2024-03-28 10:32 ` folio_mmapped David Hildenbrand
2024-03-28 10:58 ` folio_mmapped Quentin Perret
2024-03-28 11:41 ` folio_mmapped David Hildenbrand
2024-03-29 18:38 ` folio_mmapped Vishal Annapurve
2024-04-04 0:15 ` folio_mmapped Sean Christopherson
2024-03-19 15:04 ` folio_mmapped Sean Christopherson
2024-03-22 17:16 ` folio_mmapped David Hildenbrand
2024-02-26 9:03 ` [RFC PATCH v1 00/26] KVM: Restricted mapping of guest_memfd at the host and pKVM/arm64 support Fuad Tabba
2024-02-23 12:00 ` Alexandru Elisei
2024-02-26 9:05 ` Fuad Tabba
2024-02-26 9:47 ` David Hildenbrand
2024-02-27 9:37 ` Fuad Tabba
2024-02-27 14:41 ` David Hildenbrand
2024-02-27 14:49 ` David Hildenbrand
2024-02-28 9:57 ` Fuad Tabba
2024-02-28 10:12 ` David Hildenbrand [this message]
2024-02-28 14:01 ` Quentin Perret
2024-02-29 9:51 ` David Hildenbrand
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