Hi all,
just got KVM running on the Raspberry Pi4. Seems they now embedded all
required logic into that new SoC.
However, as the Raspberry kernel is not yet ready for 64-bit (and
upstream is not in sight), I had to use legacy 32-bit mode. And there we
stumble over the core detection. This little patch made it work, though:
diff --git a/arch/arm/kvm/guest.c b/arch/arm/kvm/guest.c
index 2b8de885b2bf..01606aad73cc 100644
--- a/arch/arm/kvm/guest.c
+++ b/arch/arm/kvm/guest.c
@@ -290,6 +290,7 @@ int __attribute_const__ kvm_target_cpu(void)
case ARM_CPU_PART_CORTEX_A7:
return KVM_ARM_TARGET_CORTEX_A7;
case ARM_CPU_PART_CORTEX_A15:
+ case ARM_CPU_PART_CORTEX_A72:
return KVM_ARM_TARGET_CORTEX_A15;
default:
return -EINVAL;
That raises the question if this is hack or a valid change and if there
is general interest in mapping 64-bit cores on 32-bit if they happen to
run in 32-bit mode.
Jan
PS: The RPi device tree lacks description of the GICH maintenance
interrupts. Seems KVM is fine without that - because it has the
information hard-coded or because it can live without that interrupt?
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