On 07.12.2012, at 13:50, Cornelia Huck wrote:
> Add a new virtio transport that uses channel commands to perform
> virtio operations.
>
> Add a new machine type s390-ccw that uses this virtio-ccw transport
> and make it the default machine for s390.
>
> Signed-off-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
> ---
> hw/s390-virtio.c | 149 ++++++--
> hw/s390x/Makefile.objs | 1 +
> hw/s390x/virtio-ccw.c | 909 +++++++++++++++++++++++++++++++++++++++++++++++++
> hw/s390x/virtio-ccw.h | 81 +++++
> trace-events | 4 +
> 5 files changed, 1124 insertions(+), 20 deletions(-)
> create mode 100644 hw/s390x/virtio-ccw.c
> create mode 100644 hw/s390x/virtio-ccw.h
>
> diff --git a/hw/s390-virtio.c b/hw/s390-virtio.c
> index 9e1afb2..f29ff74 100644
> --- a/hw/s390-virtio.c
> +++ b/hw/s390-virtio.c
> @@ -33,6 +33,8 @@
>
> #include "hw/s390-virtio-bus.h"
> #include "hw/s390x/sclp.h"
> +#include "hw/s390x/css.h"
> +#include "hw/s390x/virtio-ccw.h"
>
> //#define DEBUG_S390
>
> @@ -47,6 +49,7 @@
> #define KVM_S390_VIRTIO_NOTIFY 0
> #define KVM_S390_VIRTIO_RESET 1
> #define KVM_S390_VIRTIO_SET_STATUS 2
> +#define KVM_S390_VIRTIO_CCW_NOTIFY 3
>
> #define KERN_IMAGE_START 0x010000UL
> #define KERN_PARM_AREA 0x010480UL
> @@ -63,6 +66,7 @@
>
> static VirtIOS390Bus *s390_bus;
> static S390CPU **ipi_states;
> +VirtioCcwBus *ccw_bus;
>
> S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
> {
> @@ -76,15 +80,21 @@ S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
> int s390_virtio_hypercall(CPUS390XState *env, uint64_t mem, uint64_t hypercall)
> {
> int r = 0, i;
> + int cssid, ssid, schid, m;
> + SubchDev *sch;
>
> dprintf("KVM hypercall: %ld\n", hypercall);
> switch (hypercall) {
> case KVM_S390_VIRTIO_NOTIFY:
> if (mem > ram_size) {
> - VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
> - mem, &i);
> - if (dev) {
> - virtio_queue_notify(dev->vdev, i);
> + if (s390_bus) {
> + VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
> + mem, &i);
> + if (dev) {
> + virtio_queue_notify(dev->vdev, i);
> + } else {
> + r = -EINVAL;
> + }
> } else {
> r = -EINVAL;
> }
> @@ -93,28 +103,49 @@ int s390_virtio_hypercall(CPUS390XState *env, uint64_t mem, uint64_t hypercall)
> }
> break;
> case KVM_S390_VIRTIO_RESET:
> - {
> - VirtIOS390Device *dev;
> -
> - dev = s390_virtio_bus_find_mem(s390_bus, mem);
> - virtio_reset(dev->vdev);
> - stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
> - s390_virtio_device_sync(dev);
> - s390_virtio_reset_idx(dev);
> + if (s390_bus) {
> + VirtIOS390Device *dev;
> +
> + dev = s390_virtio_bus_find_mem(s390_bus, mem);
> + virtio_reset(dev->vdev);
> + stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
> + s390_virtio_device_sync(dev);
> + s390_virtio_reset_idx(dev);
> + } else {
> + r = -EINVAL;
> + }
> break;
> - }
> case KVM_S390_VIRTIO_SET_STATUS:
> - {
> - VirtIOS390Device *dev;
> + if (s390_bus) {
> + VirtIOS390Device *dev;
>
> - dev = s390_virtio_bus_find_mem(s390_bus, mem);
> - if (dev) {
> - s390_virtio_device_update_status(dev);
> + dev = s390_virtio_bus_find_mem(s390_bus, mem);
> + if (dev) {
> + s390_virtio_device_update_status(dev);
> + } else {
> + r = -EINVAL;
> + }
> } else {
> r = -EINVAL;
> }
> break;
> - }
> + case KVM_S390_VIRTIO_CCW_NOTIFY:
> + if (ccw_bus) {
> + if (ioinst_disassemble_sch_ident(env->regs[2], &m, &cssid, &ssid,
> + &schid)) {
> + r = -EINVAL;
> + } else {
> + sch = css_find_subch(m, cssid, ssid, schid);
> + if (sch && css_subch_visible(sch)) {
> + virtio_queue_notify(virtio_ccw_get_vdev(sch), env->regs[3]);
> + } else {
> + r = -EINVAL;
> + }
> + }
> + } else {
> + r = -EINVAL;
> + }
> + break;
> default:
> r = -EINVAL;
> break;
> @@ -370,7 +401,6 @@ static QEMUMachine s390_machine = {
> .no_sdcard = 1,
> .use_virtcon = 1,
> .max_cpus = 255,
> - .is_default = 1,
> };
>
> static void s390_machine_init(void)
> @@ -379,3 +409,82 @@ static void s390_machine_init(void)
> }
>
> machine_init(s390_machine_init);
> +
> +static void ccw_init(QEMUMachineInitArgs *args)
> +{
> + ram_addr_t my_ram_size = args->ram_size;
> + ram_addr_t ram_size = args->ram_size;
> + const char *cpu_model = args->cpu_model;
> + const char *kernel_filename = args->kernel_filename;
> + const char *kernel_cmdline = args->kernel_cmdline;
> + const char *initrd_filename = args->initrd_filename;
> + CPUS390XState *env = NULL;
> + MemoryRegion *sysmem = get_system_memory();
> + MemoryRegion *ram = g_new(MemoryRegion, 1);
> + int shift = 0;
> + uint8_t *storage_keys;
> + int ret;
> +
> + /* s390x ram size detection needs a 16bit multiplier + an increment. So
> + guests > 64GB can be specified in 2MB steps etc. */
> + while ((my_ram_size >> (20 + shift)) > 65535) {
> + shift++;
> + }
> + my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
> +
> + /* lets propagate the changed ram size into the global variable. */
> + ram_size = my_ram_size;
> +
> + /* get a BUS */
> + ccw_bus = virtio_ccw_bus_init();
> + s390_sclp_init();
> +
> + /* allocate RAM */
> + memory_region_init_ram(ram, "s390.ram", my_ram_size);
> + vmstate_register_ram_global(ram);
> + memory_region_add_subregion(sysmem, 0, ram);
> +
> + /* allocate storage keys */
> + storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
> +
> + /* init CPUs */
> + env = s390_init_cpus(cpu_model, storage_keys);
> +
> + kvm_s390_enable_css_support(env);
> +
> + /*
> + * Create virtual css and set it as default so that non mcss-e
> + * enabled guests only see virtio devices.
> + */
> + ret = css_create_css_image(VIRTUAL_CSSID, true);
> + assert(ret == 0);
> +
> +
> + s390_set_up_kernel(env, kernel_filename, kernel_cmdline, initrd_filename);
> +
> + /* Create VirtIO network adapters */
> + s390_create_virtio_net((BusState *)ccw_bus, "virtio-net-ccw");
> +
> +}
> +
> +static QEMUMachine ccw_machine = {
> + .name = "s390-ccw-virtio",
> + .alias = "s390-ccw",
> + .desc = "VirtIO-ccw based S390 machine",
> + .init = ccw_init,
> + .no_cdrom = 1,
> + .no_floppy = 1,
> + .no_serial = 1,
> + .no_parallel = 1,
> + .no_sdcard = 1,
> + .use_virtcon = 1,
The ccw machine should use the ASCII console as default.
Alex
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