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vfio: cleanup vfio_get_device error path, remove vfio_populate_device callback 

Now that vfio_put_base_device is called unconditionally at instance_finalize
time, it can be called twice if vfio_populate_device fails.  This works
but it is slightly harder to follow.

Change vfio_get_device to not touch the vbasedev struct until it will
definitely succeed, moving the vfio_populate_device call back to vfio-pci.
This way, vfio_put_base_device will only be called once.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-02-10 10:25:44 -07:00 committed by Alex Williamson
parent 6e48e8f9e0
commit 217e9fdcad
3 changed files with 19 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
hw/vfio/common.c
View File

@ -867,27 +867,28 @@ int vfio_get_device(VFIOGroup *group, const char *name,
VFIODevice *vbasedev)
{
struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
int ret;
int ret, fd;
ret = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
if (ret < 0) {
fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
if (fd < 0) {
error_report("vfio: error getting device %s from group %d: %m",
name, group->groupid);
error_printf("Verify all devices in group %d are bound to vfio-<bus> "
"or pci-stub and not already in use\n", group->groupid);
return fd;
}
ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
if (ret) {
error_report("vfio: error getting device info: %m");
close(fd);
return ret;
}
vbasedev->fd = ret;
vbasedev->fd = fd;
vbasedev->group = group;
QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_INFO, &dev_info);
if (ret) {
error_report("vfio: error getting device info: %m");
goto error;
}
vbasedev->num_irqs = dev_info.num_irqs;
vbasedev->num_regions = dev_info.num_regions;
vbasedev->flags = dev_info.flags;
@ -896,14 +897,7 @@ int vfio_get_device(VFIOGroup *group, const char *name,
dev_info.num_irqs);
vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
ret = vbasedev->ops->vfio_populate_device(vbasedev);
error:
if (ret) {
vfio_put_base_device(vbasedev);
}
return ret;
return 0;
}
void vfio_put_base_device(VFIODevice *vbasedev)

11
hw/vfio/pci.c
View File

@ -195,7 +195,6 @@ static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len);
static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr,
uint32_t val, int len);
static void vfio_mmap_set_enabled(VFIOPCIDevice *vdev, bool enabled);
static int vfio_populate_device(VFIODevice *vbasedev);
/*
* Disabling BAR mmaping can be slow, but toggling it around INTx can
@ -2934,12 +2933,11 @@ static VFIODeviceOps vfio_pci_ops = {
.vfio_compute_needs_reset = vfio_pci_compute_needs_reset,
.vfio_hot_reset_multi = vfio_pci_hot_reset_multi,
.vfio_eoi = vfio_eoi,
.vfio_populate_device = vfio_populate_device,
};
static int vfio_populate_device(VFIODevice *vbasedev)
static int vfio_populate_device(VFIOPCIDevice *vdev)
{
VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
VFIODevice *vbasedev = &vdev->vbasedev;
struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };
struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info) };
int i, ret = -1;
@ -3248,6 +3246,11 @@ static int vfio_initfn(PCIDevice *pdev)
return ret;
}
ret = vfio_populate_device(vdev);
if (ret) {
goto out_put;
}
/* Get a copy of config space */
ret = pread(vdev->vbasedev.fd, vdev->pdev.config,
MIN(pci_config_size(&vdev->pdev), vdev->config_size),

1
include/hw/vfio/vfio-common.h
View File

@ -112,7 +112,6 @@ struct VFIODeviceOps {
void (*vfio_compute_needs_reset)(VFIODevice *vdev);
int (*vfio_hot_reset_multi)(VFIODevice *vdev);
void (*vfio_eoi)(VFIODevice *vdev);
int (*vfio_populate_device)(VFIODevice *vdev);
};
typedef struct VFIOGroup {