[PATCH 3/5 V2] kvm tools: Add VESA device

Sasha Levin
2011-05-23T11:19:35Z

Add a simple VESA device which simply moves a framebuffer
from guest kernel to a VNC server.

VESA device PCI code is very similar to virtio-* PCI code.

Signed-off-by: John Floren <john@jfloren.net>
[ turning code into patches and cleanup ]
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
---
tools/kvm/hw/vesa.c | 108 ++++++++++++++++++++++++++++++++
tools/kvm/include/kvm/ioport.h | 2 +
tools/kvm/include/kvm/vesa.h | 27 ++++++++
tools/kvm/include/kvm/virtio-pci-dev.h | 3 +
4 files changed, 140 insertions(+), 0 deletions(-)
create mode 100644 tools/kvm/hw/vesa.c
create mode 100644 tools/kvm/include/kvm/vesa.h

diff --git a/tools/kvm/hw/vesa.c b/tools/kvm/hw/vesa.c
new file mode 100644
index 0000000..3003aa5
--- /dev/null
+++ b/tools/kvm/hw/vesa.c
@@ -0,0 +1,108 @@
+#include "kvm/vesa.h"
+#include "kvm/ioport.h"
+#include "kvm/util.h"
+#include "kvm/kvm.h"
+#include "kvm/pci.h"
+#include "kvm/kvm-cpu.h"
+#include "kvm/irq.h"
+#include "kvm/virtio-pci-dev.h"
+
+#include <rfb/rfb.h>
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <inttypes.h>
+#include <unistd.h>
+
+#define VESA_QUEUE_SIZE 128
+#define VESA_IRQ 14
+
+/*
+ * This "6000" value is pretty much the result of experimentation
+ * It seems that around this value, things update pretty smoothly
+ */
+#define VESA_UPDATE_TIME 6000
+
+u8 videomem[VESA_MEM_SIZE];
+
+static bool vesa_pci_io_in(struct kvm *kvm, u16 port, void *data, int size, u32 count)
+{
+ printf("vesa in port=%u\n", port);
+ return true;
+}
+
+static bool vesa_pci_io_out(struct kvm *kvm, u16 port, void *data, int size, u32 count)
+{
+ printf("vesa out port=%u\n", port);
+ return true;
+}
+
+static struct ioport_operations vesa_io_ops = {
+ .io_in = vesa_pci_io_in,
+ .io_out = vesa_pci_io_out,
+};
+
+static struct pci_device_header vesa_pci_device = {
+ .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
+ .device_id = PCI_DEVICE_ID_VESA,
+ .header_type = PCI_HEADER_TYPE_NORMAL,
+ .revision_id = 0,
+ .class = 0x030000,
+ .subsys_vendor_id = PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET,
+ .subsys_id = PCI_SUBSYSTEM_ID_VESA,
+ .bar[0] = IOPORT_VESA | PCI_BASE_ADDRESS_SPACE_IO,
+ .bar[1] = VESA_MEM_ADDR | PCI_BASE_ADDRESS_SPACE_MEMORY,
+};
+
+
+void vesa_mmio_callback(u64 addr, u8 *data, u32 len, u8 is_write)
+{
+ if (is_write)
+ memcpy(&videomem[addr - VESA_MEM_ADDR], data, len);
+
+ return;
+}
+
+void vesa__init(struct kvm *kvm)
+{
+ u8 dev, line, pin;
+ pthread_t thread;
+
+ if (irq__register_device(PCI_DEVICE_ID_VESA, &dev, &pin, &line) < 0)
+ return;
+
+ vesa_pci_device.irq_pin = pin;
+ vesa_pci_device.irq_line = line;
+ pci__register(&vesa_pci_device, dev);
+ ioport__register(IOPORT_VESA, &vesa_io_ops, IOPORT_VESA_SIZE);
+
+ kvm__register_mmio(VESA_MEM_ADDR, VESA_MEM_SIZE, &vesa_mmio_callback);
+ pthread_create(&thread, NULL, vesa__dovnc, kvm);
+}
+
+/*
+ * This starts a VNC server to display the framebuffer.
+ * It's not altogether clear this belongs here rather than in kvm-run.c
+ */
+void *vesa__dovnc(void *v)
+{
+ /*
+ * Make a fake argc and argv because the getscreen function
+ * seems to want it.
+ */
+ int ac = 1;
+ char av[1][1] = {{0} };
+ rfbScreenInfoPtr server;
+
+ server = rfbGetScreen(&ac, (char **)av, VESA_WIDTH, VESA_HEIGHT, 8, 3, 4);
+ server->frameBuffer = (char *)videomem;
+ server->alwaysShared = TRUE;
+ rfbInitServer(server);
+
+ while (rfbIsActive(server)) {
+ rfbMarkRectAsModified(server, 0, 0, VESA_WIDTH, VESA_HEIGHT);
+ rfbProcessEvents(server, server->deferUpdateTime * VESA_UPDATE_TIME);
+ }
+ return NULL;
+}
+
diff --git a/tools/kvm/include/kvm/ioport.h b/tools/kvm/include/kvm/ioport.h
index 218530c..8253938 100644
--- a/tools/kvm/include/kvm/ioport.h
+++ b/tools/kvm/include/kvm/ioport.h
@@ -7,6 +7,8 @@

/* some ports we reserve for own use */
#define IOPORT_DBG 0xe0
+#define IOPORT_VESA 0xa200
+#define IOPORT_VESA_SIZE 256
#define IOPORT_VIRTIO_P9 0xb200 /* Virtio 9P device */
#define IOPORT_VIRTIO_P9_SIZE 256
#define IOPORT_VIRTIO_BLK 0xc200 /* Virtio block device */
diff --git a/tools/kvm/include/kvm/vesa.h b/tools/kvm/include/kvm/vesa.h
new file mode 100644
index 0000000..3e58587
--- /dev/null
+++ b/tools/kvm/include/kvm/vesa.h
@@ -0,0 +1,27 @@
+#ifndef KVM__VESA_H
+#define KVM__VESA_H
+
+#include <linux/types.h>
+
+#define VESA_WIDTH 640
+#define VESA_HEIGHT 480
+
+#define VESA_MEM_ADDR 0xd0000000
+#define VESA_MEM_SIZE (4*VESA_WIDTH*VESA_HEIGHT)
+#define VESA_BPP 32
+
+struct kvm;
+struct int10args;
+
+void vesa_mmio_callback(u64, u8*, u32, u8);
+void vesa__init(struct kvm *self);
+void *vesa__dovnc(void *);
+void int10handler(struct int10args *args);
+
+#ifndef CONFIG_HAS_VNCSERVER
+void vesa__init(struct kvm *self) { }
+#endif
+
+extern u8 videomem[VESA_MEM_SIZE];
+
+#endif
diff --git a/tools/kvm/include/kvm/virtio-pci-dev.h b/tools/kvm/include/kvm/virtio-pci-dev.h
index 1b7862e..ca373df 100644
--- a/tools/kvm/include/kvm/virtio-pci-dev.h
+++ b/tools/kvm/include/kvm/virtio-pci-dev.h
@@ -13,8 +13,11 @@
#define PCI_DEVICE_ID_VIRTIO_CONSOLE 0x1003
#define PCI_DEVICE_ID_VIRTIO_RNG 0x1004
#define PCI_DEVICE_ID_VIRTIO_P9 0x1009
+#define PCI_DEVICE_ID_VESA 0x2000

#define PCI_VENDOR_ID_REDHAT_QUMRANET 0x1af4
#define PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET 0x1af4

+#define PCI_SUBSYSTEM_ID_VESA 0x0004
+
#endif /* VIRTIO_PCI_DEV_H_ */
--
1.7.5.rc3