arm64: vgic-v2: Fix guest endianness check in hVHE mode

In hVHE when running at the hypervisor, SCTLR_EL1 refers to the
hypervisor's System Control Register rather than the guest's. Make sure
to access the guest's register to determine its endianness.

Reported-by: Will Deacon <[email protected]>
Signed-off-by: Fuad Tabba <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Oliver Upton <[email protected]>

Author: Fuad Tabba

arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c

@@ -20,7 +20,7 @@ static bool __is_be(struct kvm_vcpu *vcpu)
 	if (vcpu_mode_is_32bit(vcpu))
 		return !!(read_sysreg_el2(SYS_SPSR) & PSR_AA32_E_BIT);
 
-	return !!(read_sysreg(SCTLR_EL1) & SCTLR_ELx_EE);
+	return !!(read_sysreg_el1(SYS_SCTLR) & SCTLR_ELx_EE);
 }
 
 /*