arm/arm64: KVM: PSCI: propagate caller endianness to the incoming vcpu

When booting a vcpu using PSCI, make sure we start it with the
endianness of the caller. Otherwise, secondaries can be pretty
unhappy to execute a BE kernel in LE mode...

This conforms to PSCI spec Rev B, 5.13.3.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
index 86a693a02ba3..ae0e06b6a492 100644
--- a/arch/arm/kvm/psci.c
+++ b/arch/arm/kvm/psci.c
@@ -62,6 +62,10 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
                 vcpu_set_thumb(vcpu);
         }
 
+        /* Propagate caller endianness */
+        if (kvm_vcpu_is_be(source_vcpu))
+                kvm_vcpu_set_be(vcpu);
+
         *vcpu_pc(vcpu) = target_pc;
         vcpu->arch.pause = false;
         smp_mb();               /* Make sure the above is visible */