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 | 51 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/hw/arm/xen_arm.c b/hw/arm/xen_arm.c index 1d3e6d481a..d1e9f7b488 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 +60,54 @@ struct XenArmState { } cfg; }; +/* + * VIRTIO_MMIO_DEV_SIZE is imported from tools/libs/light/libxl_arm.c under Xen + * repository. + * + * Origin: git://xenbits.xen.org/xen.git 2128143c114c + */ +#define VIRTIO_MMIO_DEV_SIZE 0x200 + +#define NR_VIRTIO_MMIO_DEVICES \ + (GUEST_VIRTIO_MMIO_SPI_LAST - GUEST_VIRTIO_MMIO_SPI_FIRST) + +#if CONFIG_XEN_CTRL_INTERFACE_VERSION <= 41500 +static int xendevicemodel_set_irq_level( + xendevicemodel_handle *dmod, domid_t domid, uint32_t irq, + unsigned int level) +{ + return 0; +} +#endif + +#if CONFIG_XEN_CTRL_INTERFACE_VERSION <= 41700 +#define GUEST_VIRTIO_MMIO_BASE xen_mk_ullong(0x02000000) +#define GUEST_VIRTIO_MMIO_SIZE xen_mk_ullong(0x00100000) +#define GUEST_VIRTIO_MMIO_SPI_FIRST 33 +#define GUEST_VIRTIO_MMIO_SPI_LAST 43 +#endif + +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 +159,8 @@ 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); -- 2.17.1