From: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>
In order to use virtio backends we need to allocate virtio-mmio
parameters (irq and base) and register corresponding buses.
Use the constants defined in public header arch-arm.h to be
aligned with the toolstack. So the number of current supported
virtio-mmio devices is 10.
For the interrupts triggering use already existing on Arm
device-model hypercall.
The toolstack should then insert the same amount of device nodes
into guest device-tree.
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>
Signed-off-by: Vikram Garhwal <vikram.garh...@amd.com>
---
hw/arm/xen_arm.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/hw/arm/xen_arm.c b/hw/arm/xen_arm.c
index 60dcd1bcc7..c0a93f2c9d 100644
--- a/hw/arm/xen_arm.c
+++ b/hw/arm/xen_arm.c
@@ -26,6 +26,7 @@
#include "qapi/qapi-commands-migration.h"
#include "qapi/visitor.h"
#include "hw/boards.h"
+#include "hw/irq.h"
#include "hw/sysbus.h"
#include "sysemu/block-backend.h"
#include "sysemu/tpm_backend.h"
@@ -59,6 +60,32 @@ struct XenArmState {
} cfg;
};
+#define VIRTIO_MMIO_DEV_SIZE 0x200
+
+#define NR_VIRTIO_MMIO_DEVICES \
+ (GUEST_VIRTIO_MMIO_SPI_LAST - GUEST_VIRTIO_MMIO_SPI_FIRST)
+
+static void xen_set_irq(void *opaque, int irq, int level)
+{
+ xendevicemodel_set_irq_level(xen_dmod, xen_domid, irq, level);
+}
+
+static void xen_create_virtio_mmio_devices(XenArmState *xam)
+{
+ int i;
+
+ for (i = 0; i < NR_VIRTIO_MMIO_DEVICES; i++) {
+ hwaddr base = GUEST_VIRTIO_MMIO_BASE + i * VIRTIO_MMIO_DEV_SIZE;
+ qemu_irq irq = qemu_allocate_irq(xen_set_irq, NULL,
+ GUEST_VIRTIO_MMIO_SPI_FIRST + i);
+
+ sysbus_create_simple("virtio-mmio", base, irq);
+
+ DPRINTF("Created virtio-mmio device %d: irq %d base 0x%lx\n",
+ i, GUEST_VIRTIO_MMIO_SPI_FIRST + i, base);
+ }
+}
+
void arch_handle_ioreq(XenIOState *state, ioreq_t *req)
{
hw_error("Invalid ioreq type 0x%x\n", req->type);
@@ -110,6 +137,8 @@ static void xen_arm_init(MachineState *machine)
xen_register_ioreq(xam->state, machine->smp.cpus, xen_memory_listener);
+ xen_create_virtio_mmio_devices(xam);
+
#ifdef CONFIG_TPM
if (xam->cfg.tpm_base_addr) {
xen_enable_tpm(xam);
--
2.25.1
