v4.19.13 snapshot.
diff --git a/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
new file mode 100644
index 0000000..215c7c0
--- /dev/null
+++ b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/compiler.h>
+#include <linux/irqchip/arm-gic.h>
+#include <linux/kvm_host.h>
+#include <linux/swab.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+
+static bool __hyp_text __is_be(struct kvm_vcpu *vcpu)
+{
+ if (vcpu_mode_is_32bit(vcpu))
+ return !!(read_sysreg_el2(spsr) & PSR_AA32_E_BIT);
+
+ return !!(read_sysreg(SCTLR_EL1) & SCTLR_ELx_EE);
+}
+
+/*
+ * __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the
+ * guest.
+ *
+ * @vcpu: the offending vcpu
+ *
+ * Returns:
+ * 1: GICV access successfully performed
+ * 0: Not a GICV access
+ * -1: Illegal GICV access
+ */
+int __hyp_text __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = kern_hyp_va(vcpu->kvm);
+ struct vgic_dist *vgic = &kvm->arch.vgic;
+ phys_addr_t fault_ipa;
+ void __iomem *addr;
+ int rd;
+
+ /* Build the full address */
+ fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
+ fault_ipa |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0);
+
+ /* If not for GICV, move on */
+ if (fault_ipa < vgic->vgic_cpu_base ||
+ fault_ipa >= (vgic->vgic_cpu_base + KVM_VGIC_V2_CPU_SIZE))
+ return 0;
+
+ /* Reject anything but a 32bit access */
+ if (kvm_vcpu_dabt_get_as(vcpu) != sizeof(u32))
+ return -1;
+
+ /* Not aligned? Don't bother */
+ if (fault_ipa & 3)
+ return -1;
+
+ rd = kvm_vcpu_dabt_get_rd(vcpu);
+ addr = hyp_symbol_addr(kvm_vgic_global_state)->vcpu_hyp_va;
+ addr += fault_ipa - vgic->vgic_cpu_base;
+
+ if (kvm_vcpu_dabt_iswrite(vcpu)) {
+ u32 data = vcpu_get_reg(vcpu, rd);
+ if (__is_be(vcpu)) {
+ /* guest pre-swabbed data, undo this for writel() */
+ data = swab32(data);
+ }
+ writel_relaxed(data, addr);
+ } else {
+ u32 data = readl_relaxed(addr);
+ if (__is_be(vcpu)) {
+ /* guest expects swabbed data */
+ data = swab32(data);
+ }
+ vcpu_set_reg(vcpu, rd, data);
+ }
+
+ return 1;
+}