On Thu, Jun 30, 2022 at 02:57:23PM +0100, Will Deacon wrote:

Hi everyone,

This series has been extracted from the pKVM base support series (aka
"pKVM mega-patch") previously posted here:

  https://lore.kernel.org/kvmarm/20220519134204.5379-1-will@kernel.org/ (local)

Unlike that more comprehensive series, this one is fairly fundamental
and does not introduce any new ABI commitments, leaving questions
involving the management of guest private memory and the creation of
protected VMs for future work. Instead, this series extends the pKVM EL2
code so that it can dynamically instantiate and manage VM shadow
structures without the host being able to access them directly. These
shadow structures consist of a shadow VM, a set of shadow vCPUs and the
stage-2 page-table and the pages used to hold them are returned to the
host when the VM is destroyed.

The last patch is marked as RFC because, although it plumbs in the
shadow state, it is woefully inefficient and copies to/from the host
state on every vCPU run. Without the last patch, the new structures are
unused but we move considerably closer to isolating guests from the
host.

The series is based on Marc's rework of the flags
(kvm-arm64/burn-the-flags).

Feedback welcome.

Cheers,

Only had few nitpicks

Reviewed-by: Vincent Donnefort <redacted>

Also, I've been using this patchset for quite a while now.

Tested-by: Vincent Donnefort <redacted>

[...]

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