With this patch in place igd-passthru=on actually
works, although it still requires root priviledges
because linux refuses to allow non-root users access
pci config space above offset 0x50.
Signed-off-by: Gerd Hoffmann <address@hidden>
---
hw/pci-host/igd.c | 65 +++++++++++++++++++++++--------------------------------
1 file changed, 27 insertions(+), 38 deletions(-)
diff --git a/hw/pci-host/igd.c b/hw/pci-host/igd.c
index 0784128..ec48875 100644
--- a/hw/pci-host/igd.c
+++ b/hw/pci-host/igd.c
@@ -19,47 +19,39 @@ static const IGDHostInfo igd_host_bridge_infos[] = {
{0xa8, 4}, /* SNB: base of GTT stolen memory */
};
-static int host_pci_config_read(int pos, int len, uint32_t val)
+static void host_pci_config_copy(PCIDevice *guest, const char *host,
+ const IGDHostInfo *list, int len, Error
**errp)
{
- 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");
- int ret = 0;
+ char *path;
+ int config_fd, rc, i;
- if (rc >= size || rc < 0) {
- return -ENODEV;
- }
-
- config_fd = open(path, O_RDWR);
+ path = g_strdup_printf("/sys/bus/pci/devices/%s/config", host);
+ config_fd = open(path, O_RDONLY);
if (config_fd < 0) {
- return -ENODEV;
+ error_setg_file_open(errp, errno, path);
+ goto out_free;
}
- if (lseek(config_fd, pos, SEEK_SET) != pos) {
- ret = -errno;
- goto out;
+ for (i = 0; i < len; i++) {
+ rc = pread(config_fd, guest->config + list[i].offset,
+ list[i].len, list[i].offset);
+ if (rc != list[i].len) {
+ error_setg_errno(errp, errno, "read %s, offset 0x%x",
+ path, list[i].offset);
+ goto out_close;
+ }
}
- do {
- rc = read(config_fd, (uint8_t *)&val, len);
- } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
- if (rc != len) {
- ret = -errno;
- }
-out:
+
+out_close:
close(config_fd);
- return ret;
+out_free:
+ g_free(path);
}
static void (*i440fx_realize)(PCIDevice *pci_dev, Error **errp);
static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp)
{
Error *err = NULL;
- uint32_t val = 0;
- int rc, i, num;
- int pos, len;
i440fx_realize(pci_dev, &err);
if (err != NULL) {
@@ -67,16 +59,13 @@ static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error
**errp)
return;
}
- 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) {
- error_setg(errp, "failed to read host config");
- return;
- }
- pci_default_write_config(pci_dev, pos, val, len);
+ host_pci_config_copy(pci_dev, "0000:00:00.0",
+ igd_host_bridge_infos,
+ ARRAY_SIZE(igd_host_bridge_infos),
+ &err);
+ if (err != NULL) {
+ error_propagate(errp, err);
+ return;
}
}