arm/arm64: KVM: add 'writable' parameter to kvm_phys_addr_ioremap

Add support for read-only MMIO passthrough mappings by adding a
'writable' parameter to kvm_phys_addr_ioremap. For the moment,
mappings will be read-write even if 'writable' is false, but once
the definition of PAGE_S2_DEVICE gets changed, those mappings will
be created read-only.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 862967852d5a..382fb5a88b9c 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1899,7 +1899,8 @@ int kvm_vgic_init(struct kvm *kvm)
         }
 
         ret = kvm_phys_addr_ioremap(kvm, kvm->arch.vgic.vgic_cpu_base,
-                                    vgic->vcpu_base, KVM_VGIC_V2_CPU_SIZE);
+                                    vgic->vcpu_base, KVM_VGIC_V2_CPU_SIZE,
+                                    true);
         if (ret) {
                 kvm_err("Unable to remap VGIC CPU to VCPU\n");
                 goto out;