BACKPORT: FROMLIST: KVM: arm64: smmu-v3: Initialize registers

Ensure all writable registers are properly initialized. We do not touch
registers that will not be read by the SMMU due to disabled features.

Link: https://lore.kernel.org/all/20241212180423.1578358-27-smostafa@google.com/

Bug: 357781595
Bug: 384432312

Change-Id: I2f8ed283765c3b9fe577239be96b84164a6a23f1
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Mostafa Saleh <smostafa@google.com>

include/kvm/arm_smmu_v3.h

@@ -5,8 +5,19 @@
 #include <asm/kvm_asm.h>
 #include <kvm/iommu.h>
 
+/*
+ * Parameters from the trusted host:
+ * @mmio_addr		base address of the SMMU registers
+ * @mmio_size		size of the registers resource
+ *
+ * Other members are filled and used at runtime by the SMMU driver.
+ */
 struct hyp_arm_smmu_v3_device {
 	struct kvm_hyp_iommu	iommu;
+	phys_addr_t		mmio_addr;
+	size_t			mmio_size;
+
+	void __iomem		*base;
 };
 
 extern size_t kvm_nvhe_sym(kvm_hyp_arm_smmu_v3_count);