Systems with a VMID-tagged PIPT i-cache have been supported for
a while by Linux and KVM. However, these systems never appeared
on our side of the multiverse.
Refuse to initialise KVM on such a machine, should then ever appear.
Following changes will drop the support from the hypervisor.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/kvm/arm.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 9c5573bc4614..508deed213a2 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -2195,6 +2195,11 @@ int kvm_arch_init(void *opaque)
int err;
bool in_hyp_mode;
+ if (icache_is_vpipt()) {
+ kvm_info("Incompatible VPIPT I-Cache policy\n");
+ return -ENODEV;
+ }
+
if (!is_hyp_mode_available()) {
kvm_info("HYP mode not available\n");
return -ENODEV;
--
2.34.1
