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[Qemu-devel] [PULL 04/29] piix: create host bridge to passthrough
From: |
Stefano Stabellini |
Subject: |
[Qemu-devel] [PULL 04/29] piix: create host bridge to passthrough |
Date: |
Thu, 10 Sep 2015 18:15:36 +0100 |
From: Tiejun Chen <address@hidden>
Implement a pci host bridge specific to passthrough. Actually
this just inherits the standard one. And we also just expose
a minimal real host bridge pci configuration subset.
[Replace pread with lseek and read to fix Windows build]
Signed-off-by: Tiejun Chen <address@hidden>
Signed-off-by: Stefano Stabellini <address@hidden>
Acked-by: Michael S. Tsirkin <address@hidden>
---
hw/pci-host/piix.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++
include/hw/i386/pc.h | 2 ++
2 files changed, 87 insertions(+)
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index e19badb..1fb71c8 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -739,6 +739,90 @@ static const TypeInfo i440fx_info = {
.class_init = i440fx_class_init,
};
+/* IGD Passthrough Host Bridge. */
+typedef struct {
+ uint8_t offset;
+ uint8_t len;
+} IGDHostInfo;
+
+/* Here we just expose minimal host bridge offset subset. */
+static const IGDHostInfo igd_host_bridge_infos[] = {
+ {0x08, 2}, /* revision id */
+ {0x2c, 2}, /* sybsystem vendor id */
+ {0x2e, 2}, /* sybsystem id */
+ {0x50, 2}, /* SNB: processor graphics control register */
+ {0x52, 2}, /* processor graphics control register */
+ {0xa4, 4}, /* SNB: graphics base of stolen memory */
+ {0xa8, 4}, /* SNB: base of GTT stolen memory */
+};
+
+static int host_pci_config_read(int pos, int len, uint32_t val)
+{
+ char path[PATH_MAX];
+ int config_fd;
+ ssize_t size = sizeof(path);
+ /* Access real host bridge. */
+ int rc = snprintf(path, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
+ 0, 0, 0, 0, "config");
+
+ if (rc >= size || rc < 0) {
+ return -ENODEV;
+ }
+
+ config_fd = open(path, O_RDWR);
+ if (config_fd < 0) {
+ return -ENODEV;
+ }
+
+ if (lseek(config_fd, pos, SEEK_SET) != pos) {
+ return -errno;
+ }
+ do {
+ rc = read(config_fd, (uint8_t *)&val, len);
+ } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
+ if (rc != len) {
+ return -errno;
+ }
+
+ return 0;
+}
+
+static int igd_pt_i440fx_initfn(struct PCIDevice *pci_dev)
+{
+ uint32_t val = 0;
+ int rc, i, num;
+ int pos, len;
+
+ num = ARRAY_SIZE(igd_host_bridge_infos);
+ for (i = 0; i < num; i++) {
+ pos = igd_host_bridge_infos[i].offset;
+ len = igd_host_bridge_infos[i].len;
+ rc = host_pci_config_read(pos, len, val);
+ if (rc) {
+ return -ENODEV;
+ }
+ pci_default_write_config(pci_dev, pos, val, len);
+ }
+
+ return 0;
+}
+
+static void igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+ k->init = igd_pt_i440fx_initfn;
+ dc->desc = "IGD Passthrough Host bridge";
+}
+
+static const TypeInfo igd_passthrough_i440fx_info = {
+ .name = TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE,
+ .parent = TYPE_I440FX_PCI_DEVICE,
+ .instance_size = sizeof(PCII440FXState),
+ .class_init = igd_passthrough_i440fx_class_init,
+};
+
static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
PCIBus *rootbus)
{
@@ -780,6 +864,7 @@ static const TypeInfo i440fx_pcihost_info = {
static void i440fx_register_types(void)
{
type_register_static(&i440fx_info);
+ type_register_static(&igd_passthrough_i440fx_info);
type_register_static(&piix3_pci_type_info);
type_register_static(&piix3_info);
type_register_static(&piix3_xen_info);
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 6edacbd..5cda2a3 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -222,6 +222,8 @@ typedef struct PCII440FXState PCII440FXState;
#define TYPE_I440FX_PCI_HOST_BRIDGE "i440FX-pcihost"
#define TYPE_I440FX_PCI_DEVICE "i440FX"
+#define TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE "igd-passthrough-i440FX"
+
PCIBus *i440fx_init(const char *host_type, const char *pci_type,
PCII440FXState **pi440fx_state, int *piix_devfn,
ISABus **isa_bus, qemu_irq *pic,
--
1.7.10.4
- [Qemu-devel] [PULL 00/29] xen-2015-09-10-tag, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 04/29] piix: create host bridge to passthrough,
Stefano Stabellini <=
- [Qemu-devel] [PULL 01/29] xen-hvm: Add trace to ioreq, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 10/29] xen, gfx passthrough: register host bridge specific to passthrough, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 02/29] i440fx: make types configurable at run-time, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 03/29] pc_init1: pass parameters just with types, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 07/29] xen, gfx passthrough: retrieve VGA BIOS to work, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 05/29] hw/pci-assign: split pci-assign.c, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 09/29] xen, gfx passthrough: register a isa bridge, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 06/29] xen, gfx passthrough: basic graphics passthrough support, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 08/29] igd gfx passthrough: create a isa bridge, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 26/29] xen/pt: Make xen_pt_unregister_device idempotent, Stefano Stabellini, 2015/09/10