Signed-off-by: Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>
---
qemu/Makefile.target | 2 +-
qemu/hw/pc.c | 4 +-
qemu/hw/pc.h | 3 +
qemu/hw/virtio-hotplug.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++
qemu/monitor.c | 11 +++++
qemu/qemu-kvm.h | 2 +
6 files changed, 131 insertions(+), 2 deletions(-)
create mode 100644 qemu/hw/virtio-hotplug.c
diff --git a/qemu/Makefile.target b/qemu/Makefile.target
index bb7be0f..4d5679a 100644
--- a/qemu/Makefile.target
+++ b/qemu/Makefile.target
@@ -464,7 +464,7 @@ VL_OBJS += rtl8139.o
VL_OBJS+= hypercall.o
# virtio devices
-VL_OBJS += virtio.o virtio-net.o virtio-blk.o
+VL_OBJS += virtio.o virtio-net.o virtio-blk.o virtio-hotplug.o
ifeq ($(TARGET_BASE_ARCH), i386)
# Hardware support
diff --git a/qemu/hw/pc.c b/qemu/hw/pc.c
index 3972ab4..c9d8f89 100644
--- a/qemu/hw/pc.c
+++ b/qemu/hw/pc.c
@@ -1029,7 +1029,9 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
}
}
-#define USE_HYPERCALL
+ virtio_hotplug_init(pci_bus);
+
+#undef USE_HYPERCALL
#ifdef USE_HYPERCALL
pci_hypercall_init(pci_bus);
#endif
diff --git a/qemu/hw/pc.h b/qemu/hw/pc.h
index 7d1832f..3e2cfb4 100644
--- a/qemu/hw/pc.h
+++ b/qemu/hw/pc.h
@@ -151,6 +151,9 @@ void virtio_net_poll(void);
void *virtio_blk_init(PCIBus *bus, uint16_t vendor, uint16_t device,
BlockDriverState *bs);
+/* virtio-hotplug.c */
+void *virtio_hotplug_init(PCIBus *bus);
+
/* extboot.c */
void extboot_init(BlockDriverState *bs, int cmd);
diff --git a/qemu/hw/virtio-hotplug.c b/qemu/hw/virtio-hotplug.c
new file mode 100644
index 0000000..e51f26f
--- /dev/null
+++ b/qemu/hw/virtio-hotplug.c
@@ -0,0 +1,111 @@
+#include "virtio.h"
+#include "net.h"
+#include "pc.h"
+#include "sysemu.h"
+
+typedef struct VirtIOHotplug {
+ VirtIODevice vdev;
+ VirtQueue *cmd_vq;
+ int buffer_ready;
+ struct VirtIOHotplug *next;
+ int job_status;
+} VirtIOHotplug;
+
+typedef struct VirtioHotplugHdr {
+ uint8_t cmd;
+ uint8_t status;
+} VirtioHotplugHdr;
+
+VirtIOHotplug *virtio_hotplug;
+uint32_t attempt_buffer;
+
+#define VIRTIO_ID_HOTPLUG 4 /* arbitrary */
+
+#define CMD_CPU_SET 1
+
+static VirtIOHotplug *to_virtio_hotplug(VirtIODevice *vdev)
+{
+ return (VirtIOHotplug *)vdev;
+}
+
+static void virtio_hotplug_update_config(VirtIODevice *vdev, uint8_t *config)
+{
+ /* nothing to do */
+}
+
+static uint32_t virtio_hotplug_get_features(VirtIODevice *vdev)
+{
+ /* no features yet */
+ return 0;
+}
+
+static void virtio_hotplug_send(VirtIODevice *vdev, VirtQueue *vq, uint8_t cmd,
+ const uint32_t arg)
+{
+ VirtQueueElement elem;
+ VirtioHotplugHdr *hdr;
+ uint32_t *data;
+
+ if (virtqueue_pop(vq, &elem) == 0) {
+ fprintf(stderr, "pop failure\n");
+ return;
+ }
+
+ hdr = (void *)elem.in_sg[0].iov_base;
+ hdr->cmd = cmd;
+
+ data = (int *)elem.in_sg[1].iov_base;
+ *data = arg;
+
+ virtqueue_push(vq, &elem, sizeof(*hdr) + elem.in_sg[1].iov_len);
+ virtio_notify(vdev, vq);
+}
+
+int hotplug_send_cmd(int value)
+{
+
+ if (!virtio_hotplug->buffer_ready) {
+ attempt_buffer = value;
+ return;
+ }
+
+ virtio_hotplug_send(&virtio_hotplug->vdev, virtio_hotplug->cmd_vq,
+ CMD_CPU_SET, value);
+
+ return 0;
+}
+
+/* TX */
+static void virtio_hotplug_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIOHotplug *n = to_virtio_hotplug(vdev);
+
+ n->buffer_ready = 1;
+
+ if (attempt_buffer) {
+ uint32_t value = attempt_buffer;
+ attempt_buffer = 0;
+ hotplug_send_cmd(value);
+ }
+
+}
+
+void *virtio_hotplug_init(PCIBus *bus)
+{
+ VirtIOHotplug *n;
+
+ n = (VirtIOHotplug *)virtio_init_pci(bus, "virtio-hotplug", 0x2523, 0x2325,
+ 0, VIRTIO_ID_HOTPLUG,
+ 0xff, 0x80, 0x00,
+ 6, sizeof(VirtIOHotplug));
+
+ n->vdev.update_config = virtio_hotplug_update_config;
+ n->vdev.get_features = virtio_hotplug_get_features;
+ n->cmd_vq = virtio_add_queue(&n->vdev, 128, virtio_hotplug_handle_cmd);
+
+ n->buffer_ready = 0;
+
+ virtio_hotplug = n;
+
+ return &n->vdev;
+}
diff --git a/qemu/monitor.c b/qemu/monitor.c
index e03c473..f0c55c6 100644
--- a/qemu/monitor.c
+++ b/qemu/monitor.c
@@ -346,6 +346,16 @@ static void do_cpu_set(int index)
term_printf("Invalid CPU index\n");
}
+static void do_cpu_set_nr(int value)
+{
+ if ((value < 1)) {
+ term_printf("value out of range\n");
+ return;
+ }
+
+ hotplug_send_cmd(value);
+}
+
static void do_info_jit(void)
{
dump_exec_info(NULL, monitor_fprintf);
@@ -1339,6 +1349,7 @@ static term_cmd_t term_cmds[] = {
"", "cancel the current VM migration" },
{ "migrate_set_speed", "s", do_migrate_set_speed,
"value", "set maximum speed (in bytes) for migrations" },
+ { "cpu_set", "i", do_cpu_set_nr, "value", "number of cpus in the guest" },
{ NULL, NULL, },
};
diff --git a/qemu/qemu-kvm.h b/qemu/qemu-kvm.h
index e4aeb3a..6bf234d 100644
--- a/qemu/qemu-kvm.h
+++ b/qemu/qemu-kvm.h
@@ -48,6 +48,8 @@ void kvm_tpr_access_report(CPUState *env, uint64_t rip, int is_write);
int handle_tpr_access(void *opaque, int vcpu,
uint64_t rip, int is_write);
+int hotplug_send_smd(int cpus);
+
#define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
#define BITMAP_SIZE(m) (ALIGN(((m)>>TARGET_PAGE_BITS), HOST_LONG_BITS) / 8)
--
1.5.0.6
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