KVM: arm64: Disallow dirty logging and RO memslots with pKVM
The current implementation of pKVM doesn't support dirty logging or
read-only memslots. Although support for these features is desirable,
this will require future work, so let's cleanly report the limitations
to userspace by failing the ioctls until then.
Signed-off-by: Quentin Perret <qperret@google.com>
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 644ccad..94db8d0 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1807,11 +1807,14 @@
change != KVM_MR_FLAGS_ONLY)
return 0;
- /* In protected mode, cannot modify memslots once a VM has run. */
- if (is_protected_kvm_enabled() &&
- (change == KVM_MR_DELETE || change == KVM_MR_MOVE) &&
- kvm->arch.pkvm.shadow_handle) {
- return -EPERM;
+ if (is_protected_kvm_enabled()) {
+ /* In protected mode, cannot modify memslots once a VM has run. */
+ if ((change == KVM_MR_DELETE || change == KVM_MR_MOVE) &&
+ kvm->arch.pkvm.shadow_handle) {
+ return -EPERM;
+ }
+ if (new->flags & (KVM_MEM_LOG_DIRTY_PAGES | KVM_MEM_READONLY))
+ return -EPERM;
}
/*
