arm/virt: Add support for GICv2 virtualization extensions

Add support for GICv2 virtualization extensions by mapping the necessary
I/O regions and connecting the maintenance IRQ lines.

Declare those additions in the device tree and in the ACPI tables.
Signed-off-by: NLuc Michel <luc.michel@greensocs.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 20180727095421.386-21-luc.michel@greensocs.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/virt-acpi-build.c

@@ -659,6 +659,8 @@ build_madt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
         gicc->length = sizeof(*gicc);
         if (vms->gic_version == 2) {
             gicc->base_address = cpu_to_le64(memmap[VIRT_GIC_CPU].base);
+            gicc->gich_base_address = cpu_to_le64(memmap[VIRT_GIC_HYP].base);
+            gicc->gicv_base_address = cpu_to_le64(memmap[VIRT_GIC_VCPU].base);
         }
         gicc->cpu_interface_number = cpu_to_le32(i);
         gicc->arm_mpidr = cpu_to_le64(armcpu->mp_affinity);
@@ -668,8 +670,8 @@ build_madt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
         if (arm_feature(&armcpu->env, ARM_FEATURE_PMU)) {
             gicc->performance_interrupt = cpu_to_le32(PPI(VIRTUAL_PMU_IRQ));
         }
-        if (vms->virt && vms->gic_version == 3) {
-            gicc->vgic_interrupt = cpu_to_le32(PPI(ARCH_GICV3_MAINT_IRQ));
+        if (vms->virt) {
+            gicc->vgic_interrupt = cpu_to_le32(PPI(ARCH_GIC_MAINT_IRQ));
         }
     }
 

hw/arm/virt.c

@@ -131,6 +131,8 @@ static const MemMapEntry a15memmap[] = {
     [VIRT_GIC_DIST] =           { 0x08000000, 0x00010000 },
     [VIRT_GIC_CPU] =            { 0x08010000, 0x00010000 },
     [VIRT_GIC_V2M] =            { 0x08020000, 0x00001000 },
+    [VIRT_GIC_HYP] =            { 0x08030000, 0x00010000 },
+    [VIRT_GIC_VCPU] =           { 0x08040000, 0x00010000 },
     /* The space in between here is reserved for GICv3 CPU/vCPU/HYP */
     [VIRT_GIC_ITS] =            { 0x08080000, 0x00020000 },
     /* This redistributor space allows up to 2*64kB*123 CPUs */
@@ -440,18 +442,33 @@ static void fdt_add_gic_node(VirtMachineState *vms)
 
         if (vms->virt) {
             qemu_fdt_setprop_cells(vms->fdt, nodename, "interrupts",
-                                   GIC_FDT_IRQ_TYPE_PPI, ARCH_GICV3_MAINT_IRQ,
+                                   GIC_FDT_IRQ_TYPE_PPI, ARCH_GIC_MAINT_IRQ,
                                    GIC_FDT_IRQ_FLAGS_LEVEL_HI);
         }
     } else {
         /* 'cortex-a15-gic' means 'GIC v2' */
         qemu_fdt_setprop_string(vms->fdt, nodename, "compatible",
                                 "arm,cortex-a15-gic");
-        qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg",
-                                      2, vms->memmap[VIRT_GIC_DIST].base,
-                                      2, vms->memmap[VIRT_GIC_DIST].size,
-                                      2, vms->memmap[VIRT_GIC_CPU].base,
-                                      2, vms->memmap[VIRT_GIC_CPU].size);
+        if (!vms->virt) {
+            qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg",
+                                         2, vms->memmap[VIRT_GIC_DIST].base,
+                                         2, vms->memmap[VIRT_GIC_DIST].size,
+                                         2, vms->memmap[VIRT_GIC_CPU].base,
+                                         2, vms->memmap[VIRT_GIC_CPU].size);
+        } else {
+            qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg",
+                                         2, vms->memmap[VIRT_GIC_DIST].base,
+                                         2, vms->memmap[VIRT_GIC_DIST].size,
+                                         2, vms->memmap[VIRT_GIC_CPU].base,
+                                         2, vms->memmap[VIRT_GIC_CPU].size,
+                                         2, vms->memmap[VIRT_GIC_HYP].base,
+                                         2, vms->memmap[VIRT_GIC_HYP].size,
+                                         2, vms->memmap[VIRT_GIC_VCPU].base,
+                                         2, vms->memmap[VIRT_GIC_VCPU].size);
+            qemu_fdt_setprop_cells(vms->fdt, nodename, "interrupts",
+                                   GIC_FDT_IRQ_TYPE_PPI, ARCH_GIC_MAINT_IRQ,
+                                   GIC_FDT_IRQ_FLAGS_LEVEL_HI);
+        }
     }
 
     qemu_fdt_setprop_cell(vms->fdt, nodename, "phandle", vms->gic_phandle);
@@ -573,6 +590,11 @@ static void create_gic(VirtMachineState *vms, qemu_irq *pic)
             qdev_prop_set_uint32(gicdev, "redist-region-count[1]",
                 MIN(smp_cpus - redist0_count, redist1_capacity));
         }
+    } else {
+        if (!kvm_irqchip_in_kernel()) {
+            qdev_prop_set_bit(gicdev, "has-virtualization-extensions",
+                              vms->virt);
+        }
     }
     qdev_init_nofail(gicdev);
     gicbusdev = SYS_BUS_DEVICE(gicdev);
@@ -584,6 +606,10 @@ static void create_gic(VirtMachineState *vms, qemu_irq *pic)
         }
     } else {
         sysbus_mmio_map(gicbusdev, 1, vms->memmap[VIRT_GIC_CPU].base);
+        if (vms->virt) {
+            sysbus_mmio_map(gicbusdev, 2, vms->memmap[VIRT_GIC_HYP].base);
+            sysbus_mmio_map(gicbusdev, 3, vms->memmap[VIRT_GIC_VCPU].base);
+        }
     }
 
     /* Wire the outputs from each CPU's generic timer and the GICv3
@@ -610,9 +636,17 @@ static void create_gic(VirtMachineState *vms, qemu_irq *pic)
                                                    ppibase + timer_irq[irq]));
         }
 
-        qdev_connect_gpio_out_named(cpudev, "gicv3-maintenance-interrupt", 0,
-                                    qdev_get_gpio_in(gicdev, ppibase
-                                                     + ARCH_GICV3_MAINT_IRQ));
+        if (type == 3) {
+            qemu_irq irq = qdev_get_gpio_in(gicdev,
+                                            ppibase + ARCH_GIC_MAINT_IRQ);
+            qdev_connect_gpio_out_named(cpudev, "gicv3-maintenance-interrupt",
+                                        0, irq);
+        } else if (vms->virt) {
+            qemu_irq irq = qdev_get_gpio_in(gicdev,
+                                            ppibase + ARCH_GIC_MAINT_IRQ);
+            sysbus_connect_irq(gicbusdev, i + 4 * smp_cpus, irq);
+        }
+
         qdev_connect_gpio_out_named(cpudev, "pmu-interrupt", 0,
                                     qdev_get_gpio_in(gicdev, ppibase
                                                      + VIRTUAL_PMU_IRQ));

include/hw/arm/virt.h

@@ -42,7 +42,7 @@
 #define NUM_VIRTIO_TRANSPORTS 32
 #define NUM_SMMU_IRQS          4
 
-#define ARCH_GICV3_MAINT_IRQ  9
+#define ARCH_GIC_MAINT_IRQ  9
 
 #define ARCH_TIMER_VIRT_IRQ   11
 #define ARCH_TIMER_S_EL1_IRQ  13
@@ -60,6 +60,8 @@ enum {
     VIRT_GIC_DIST,
     VIRT_GIC_CPU,
     VIRT_GIC_V2M,
+    VIRT_GIC_HYP,
+    VIRT_GIC_VCPU,
     VIRT_GIC_ITS,
     VIRT_GIC_REDIST,
     VIRT_GIC_REDIST2,