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Re: [Qemu-devel] [PATCH 8/8] s390: Add new channel I/O based virtio tran
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From: |
Alexander Graf |
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Subject: |
Re: [Qemu-devel] [PATCH 8/8] s390: Add new channel I/O based virtio transport. |
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Date: |
Wed, 16 Jan 2013 14:53:06 +0100 |
On 16.01.2013, at 14:24, Alexander Graf wrote:
>
> 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 <address@hidden>
>> ---
>> 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.
In fact, here is a patch doing this based on the code base that this patch set
was on. It would be nice to include this for the next round of the virtio-ccw
machine.
Alex
diff --git a/hw/boards.h b/hw/boards.h
index 813d0e5..7ab634a 100644
--- a/hw/boards.h
+++ b/hw/boards.h
@@ -29,6 +29,7 @@ typedef struct QEMUMachine {
unsigned int no_serial:1,
no_parallel:1,
use_virtcon:1,
+ use_sclp:1,
no_floppy:1,
no_cdrom:1,
no_sdcard:1;
diff --git a/hw/s390-virtio.c b/hw/s390-virtio.c
index e03ac52..3b908d6 100644
--- a/hw/s390-virtio.c
+++ b/hw/s390-virtio.c
@@ -483,7 +483,7 @@ static QEMUMachine ccw_machine = {
.no_serial = 1,
.no_parallel = 1,
.no_sdcard = 1,
- .use_virtcon = 1,
+ .use_sclp = 1,
.max_cpus = 255,
.is_default = 1,
};
diff --git a/vl.c b/vl.c
index bee122e..803463e 100644
--- a/vl.c
+++ b/vl.c
@@ -176,6 +176,7 @@ int main(int argc, char **argv)
#define DEFAULT_RAM_SIZE 512
#define MAX_VIRTIO_CONSOLES 1
+#define MAX_SCLP_CONSOLES 1
static const char *data_dir;
const char *bios_name = NULL;
@@ -203,6 +204,7 @@ int no_quit = 0;
CharDriverState *serial_hds[MAX_SERIAL_PORTS];
CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
CharDriverState *virtcon_hds[MAX_VIRTIO_CONSOLES];
+CharDriverState *sclp_hds[MAX_SCLP_CONSOLES];
int win2k_install_hack = 0;
int singlestep = 0;
int smp_cpus = 1;
@@ -272,6 +274,7 @@ static int tcg_tb_size;
static int default_serial = 1;
static int default_parallel = 1;
static int default_virtcon = 1;
+static int default_sclp = 1;
static int default_monitor = 1;
static int default_floppy = 1;
static int default_cdrom = 1;
@@ -2157,6 +2160,7 @@ struct device_config {
DEV_VIRTCON, /* -virtioconsole */
DEV_DEBUGCON, /* -debugcon */
DEV_GDB, /* -gdb, -s */
+ DEV_SCLP, /* s390 sclp */
} type;
const char *cmdline;
Location loc;
@@ -2275,6 +2279,39 @@ static int virtcon_parse(const char *devname)
return 0;
}
+static int sclp_parse(const char *devname)
+{
+ QemuOptsList *device = qemu_find_opts("device");
+ static int index = 0;
+ char label[32];
+ QemuOpts *dev_opts;
+
+ if (strcmp(devname, "none") == 0) {
+ return 0;
+ }
+ if (index == MAX_SCLP_CONSOLES) {
+ fprintf(stderr, "qemu: too many sclp consoles\n");
+ exit(1);
+ }
+
+ assert(arch_type == QEMU_ARCH_S390X);
+
+ dev_opts = qemu_opts_create(device, NULL, 0, NULL);
+ qemu_opt_set(dev_opts, "driver", "sclpconsole");
+
+ snprintf(label, sizeof(label), "sclpcon%d", index);
+ sclp_hds[index] = qemu_chr_new(label, devname, NULL);
+ if (!sclp_hds[index]) {
+ fprintf(stderr, "qemu: could not connect sclp console"
+ " to character backend '%s'\n", devname);
+ return -1;
+ }
+ qemu_opt_set(dev_opts, "chardev", label);
+
+ index++;
+ return 0;
+}
+
static int debugcon_parse(const char *devname)
{
QemuOpts *opts;
@@ -3654,6 +3691,9 @@ int main(int argc, char **argv, char **envp)
if (!machine->use_virtcon) {
default_virtcon = 0;
}
+ if (!machine->use_sclp) {
+ default_sclp = 0;
+ }
if (machine->no_floppy) {
default_floppy = 0;
}
@@ -3671,11 +3711,15 @@ int main(int argc, char **argv, char **envp)
add_device_config(DEV_SERIAL, "mon:stdio");
} else if (default_virtcon && default_monitor) {
add_device_config(DEV_VIRTCON, "mon:stdio");
+ } else if (default_sclp && default_monitor) {
+ add_device_config(DEV_SCLP, "mon:stdio");
} else {
if (default_serial)
add_device_config(DEV_SERIAL, "stdio");
if (default_virtcon)
add_device_config(DEV_VIRTCON, "stdio");
+ if (default_sclp)
+ add_device_config(DEV_SCLP, "stdio");
if (default_monitor)
monitor_parse("stdio", "readline");
}
@@ -3688,6 +3732,8 @@ int main(int argc, char **argv, char **envp)
monitor_parse("vc:80Cx24C", "readline");
if (default_virtcon)
add_device_config(DEV_VIRTCON, "vc:80Cx24C");
+ if (default_sclp)
+ add_device_config(DEV_SCLP, "vc:80Cx24C");
}
socket_init();
@@ -3855,6 +3901,8 @@ int main(int argc, char **argv, char **envp)
exit(1);
if (foreach_device_config(DEV_VIRTCON, virtcon_parse) < 0)
exit(1);
+ if (foreach_device_config(DEV_SCLP, sclp_parse) < 0)
+ exit(1);
if (foreach_device_config(DEV_DEBUGCON, debugcon_parse) < 0)
exit(1);