KVM: arm64: Filter out non-kernel addresses in kern_hyp_va

kern_hyp_va() is idempotent for the hypervisor linear space. This is
handy for nVHE hypervisor callers handling kvm_vcpu or kvm_arch
pointers. Those pointers can originate from the hypervisor space (when
protected mode is enabled, we don't trust the kernel and the hypervisor
uses its own copy) or from the kernel space (we do trust the kernel in
"non-protected" nVHE).

This idempotence does not hold for addresses within the hypervisor
private range, like the ones you get from the pKVM heap allocator
(hyp_alloc()). To resolve this, filter out non-kernel addresses based on
PAGE_OFFSET.

Leave the assembly version untouched as it has no current users.

Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
Tested-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20261001142849.3367614-12-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

0 files changed, 0 insertions, 0 deletions