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The host kernel is currently able to change EL2 stage-1 mappings without restrictions thanks to the __pkvm_create_mappings() hypercall. But in a world where the host is no longer part of the TCB, this clearly poses a problem. To fix this, introduce a new hypercall to allow the host to share a physical memory page with the hypervisor, and remove the __pkvm_create_mappings() variant. The new hypercall implements ownership and permission checks before allowing the sharing operation, and it annotates the shared page in the hypervisor stage-1 and host stage-2 page-tables. Signed-off-by: Quentin Perret <qperret@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210809152448.1810400-21-qperret@google.com |
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| .. | ||
| include | ||
| nvhe | ||
| vhe | ||
| aarch32.c | ||
| entry.S | ||
| exception.c | ||
| fpsimd.S | ||
| hyp-entry.S | ||
| Makefile | ||
| pgtable.c | ||
| reserved_mem.c | ||
| vgic-v2-cpuif-proxy.c | ||
| vgic-v3-sr.c | ||