Peter
Gmail always marks your mail as spam, any ideas?
Itaru.
On Sat, Jul 9, 2022 at 6:24 Peter Collingbourne <pcc@xxxxxxxxxx> wrote:
Hi,
This patch series contains a proposed extension to pKVM that allows MTE
to be exposed to the protected guests. It is based on the base pKVM
series previously sent to the list [1] and later rebased to 5.19-rc3
and uploaded to [2].
This series takes precautions against host compromise of the guests
via direct access to their tag storage, by preventing the host from
accessing the tag storage via stage 2 page tables. The device tree
must describe the physical memory address of the tag storage, if any,
and the memory nodes must declare that the tag storage location is
described. Otherwise, the MTE feature is disabled in protected guests.
Now that we can easily do so, we also prevent the host from accessing
any unmapped reserved-memory regions without a driver, as the host
has no business accessing that memory.
A proposed extension to the devicetree specification is available at
[3], a patched version of QEMU that produces the required device tree
nodes is available at [4] and a patched version of the crosvm hypervisor
that enables MTE is available at [5].
v2:
- refcount the PTEs owned by NOBODY
[1] https://lore.kernel.org/all/20220519134204.5379-1-will@xxxxxxxxxx/
[2] https://android-kvm.googlesource.com/linux/ for-upstream/pkvm-base-v2
[3] https://github.com/pcc/devicetree-specification mte-alloc
[4] https://github.com/pcc/qemu mte-shared-alloc
[5] https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3719324
Peter Collingbourne (3):
KVM: arm64: add a hypercall for disowning pages
KVM: arm64: disown unused reserved-memory regions
KVM: arm64: allow MTE in protected VMs if the tag storage is known
arch/arm64/include/asm/kvm_asm.h | 1 +
arch/arm64/include/asm/kvm_host.h | 6 ++
arch/arm64/include/asm/kvm_pkvm.h | 4 +-
arch/arm64/kernel/image-vars.h | 3 +
arch/arm64/kvm/arm.c | 83 ++++++++++++++++++-
arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 1 +
arch/arm64/kvm/hyp/include/nvhe/pkvm.h | 1 +
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 9 ++
arch/arm64/kvm/hyp/nvhe/mem_protect.c | 11 +++
arch/arm64/kvm/hyp/nvhe/pkvm.c | 8 +-
arch/arm64/kvm/mmu.c | 4 +-
11 files changed, 123 insertions(+), 8 deletions(-)
--
2.37.0.144.g8ac04bfd2-goog
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
_______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
