KVM: arm64: Minimise EL2's exposure of host VGIC state during world switch

The host passes a vgic_v3_cpu_if pointer to the __vgic_v3_save_aprs and
__vgic_v3_restore_vmcr_aprs hypercalls, which EL2 dereferences
wholesale. That exposes the host's full VGIC emulation state to the
hypervisor, against pKVM's isolation goals.

Recover the host vCPU from the supplied cpu_if via container_of() and
copy only vgic_vmcr and the active priority registers between EL2's
hyp-side state and the host vCPU, so EL2 no longer dereferences the
host's vgic_v3_cpu_if directly.

Reviewed-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Co-developed-by: Fuad Tabba <fuad.tabba@linux.dev>
Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20260729131823.2021516-7-fuad.tabba@linux.dev
Signed-off-by: Oliver Upton <oupton@kernel.org>

0 files changed, 0 insertions, 0 deletions