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authorAlex Williamson <alex.williamson@redhat.com>2023-06-01 08:45:06 -0600
committerCédric Le Goater <clg@redhat.com>2023-06-30 06:02:51 +0200
commit634f38f0f73f12b86a53195782b26506c107a418 (patch)
treef7027e64f5315a3713a2e2900715c57e015d4e16 /hw/vfio
parent745c42912a04306e8c7765dd4cc1574a92de4446 (diff)
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vfio: Implement a common device info helper
A common helper implementing the realloc algorithm for handling capabilities. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Cédric Le Goater <clg@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: Robin Voetter <robin@streamhpc.com> Signed-off-by: Cédric Le Goater <clg@redhat.com>
Diffstat (limited to 'hw/vfio')
-rw-r--r--hw/vfio/common.c46
1 files changed, 35 insertions, 11 deletions
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 25801de..28ec9e9 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -2846,11 +2846,35 @@ void vfio_put_group(VFIOGroup *group)
}
}
+struct vfio_device_info *vfio_get_device_info(int fd)
+{
+ struct vfio_device_info *info;
+ uint32_t argsz = sizeof(*info);
+
+ info = g_malloc0(argsz);
+
+retry:
+ info->argsz = argsz;
+
+ if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) {
+ g_free(info);
+ return NULL;
+ }
+
+ if (info->argsz > argsz) {
+ argsz = info->argsz;
+ info = g_realloc(info, argsz);
+ goto retry;
+ }
+
+ return info;
+}
+
int vfio_get_device(VFIOGroup *group, const char *name,
VFIODevice *vbasedev, Error **errp)
{
- struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
- int ret, fd;
+ g_autofree struct vfio_device_info *info = NULL;
+ int fd;
fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
if (fd < 0) {
@@ -2862,11 +2886,11 @@ int vfio_get_device(VFIOGroup *group, const char *name,
return fd;
}
- ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
- if (ret) {
+ info = vfio_get_device_info(fd);
+ if (!info) {
error_setg_errno(errp, errno, "error getting device info");
close(fd);
- return ret;
+ return -1;
}
/*
@@ -2894,14 +2918,14 @@ int vfio_get_device(VFIOGroup *group, const char *name,
vbasedev->group = group;
QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
- vbasedev->num_irqs = dev_info.num_irqs;
- vbasedev->num_regions = dev_info.num_regions;
- vbasedev->flags = dev_info.flags;
+ vbasedev->num_irqs = info->num_irqs;
+ vbasedev->num_regions = info->num_regions;
+ vbasedev->flags = info->flags;
+
+ trace_vfio_get_device(name, info->flags, info->num_regions, info->num_irqs);
- trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
- dev_info.num_irqs);
+ vbasedev->reset_works = !!(info->flags & VFIO_DEVICE_FLAGS_RESET);
- vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
return 0;
}