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Re: [PATCH 1/3] vfio: Make VFIOIOMMUClass::attach_device() and its wrapp
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From: |
Cédric Le Goater |
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Subject: |
Re: [PATCH 1/3] vfio: Make VFIOIOMMUClass::attach_device() and its wrapper return bool |
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Date: |
Mon, 6 May 2024 13:59:46 +0200 |
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User-agent: |
Mozilla Thunderbird |
On 5/6/24 10:33, Zhenzhong Duan wrote:
Make VFIOIOMMUClass::attach_device() and its wrapper function
vfio_attach_device() return bool.
This is to follow the coding standand to return bool if 'Error **'
is used to pass error.
Suggested-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
include/hw/vfio/vfio-common.h | 4 ++--
include/hw/vfio/vfio-container-base.h | 4 ++--
hw/vfio/ap.c | 6 ++----
hw/vfio/ccw.c | 6 ++----
hw/vfio/common.c | 4 ++--
hw/vfio/container.c | 14 +++++++-------
hw/vfio/iommufd.c | 11 +++++------
hw/vfio/pci.c | 8 +++-----
hw/vfio/platform.c | 7 +++----
9 files changed, 28 insertions(+), 36 deletions(-)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index b9da6c08ef..a7b6fc8f46 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -198,8 +198,8 @@ void vfio_region_exit(VFIORegion *region);
void vfio_region_finalize(VFIORegion *region);
void vfio_reset_handler(void *opaque);
struct vfio_device_info *vfio_get_device_info(int fd);
-int vfio_attach_device(char *name, VFIODevice *vbasedev,
- AddressSpace *as, Error **errp);
+bool vfio_attach_device(char *name, VFIODevice *vbasedev,
+ AddressSpace *as, Error **errp);
void vfio_detach_device(VFIODevice *vbasedev);
int vfio_kvm_device_add_fd(int fd, Error **errp);
diff --git a/include/hw/vfio/vfio-container-base.h
b/include/hw/vfio/vfio-container-base.h
index 3582d5f97a..c839cfd9cb 100644
--- a/include/hw/vfio/vfio-container-base.h
+++ b/include/hw/vfio/vfio-container-base.h
@@ -118,8 +118,8 @@ struct VFIOIOMMUClass {
int (*dma_unmap)(const VFIOContainerBase *bcontainer,
hwaddr iova, ram_addr_t size,
IOMMUTLBEntry *iotlb);
- int (*attach_device)(const char *name, VFIODevice *vbasedev,
- AddressSpace *as, Error **errp);
+ bool (*attach_device)(const char *name, VFIODevice *vbasedev,
+ AddressSpace *as, Error **errp);
void (*detach_device)(VFIODevice *vbasedev);
/* migration feature */
int (*set_dirty_page_tracking)(const VFIOContainerBase *bcontainer,
diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index 7c4caa5938..d50600b702 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -156,7 +156,6 @@ static void vfio_ap_unregister_irq_notifier(VFIOAPDevice
*vapdev,
static void vfio_ap_realize(DeviceState *dev, Error **errp)
{
ERRP_GUARD();
- int ret;
Error *err = NULL;
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev);
VFIODevice *vbasedev = &vapdev->vdev;
@@ -165,9 +164,8 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
return;
}
- ret = vfio_attach_device(vbasedev->name, vbasedev,
- &address_space_memory, errp);
- if (ret) {
+ if (!vfio_attach_device(vbasedev->name, vbasedev,
+ &address_space_memory, errp)) {
goto error;
}
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 90e4a53437..782bd4bed7 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -580,7 +580,6 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
VFIODevice *vbasedev = &vcdev->vdev;
Error *err = NULL;
- int ret;
/* Call the class init function for subchannel. */
if (cdc->realize) {
@@ -594,9 +593,8 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
return;
}
- ret = vfio_attach_device(cdev->mdevid, vbasedev,
- &address_space_memory, errp);
- if (ret) {
+ if (!vfio_attach_device(cdev->mdevid, vbasedev,
+ &address_space_memory, errp)) {
goto out_attach_dev_err;
}
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 8f9cbdc026..890d30910e 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1492,8 +1492,8 @@ retry:
return info;
}
-int vfio_attach_device(char *name, VFIODevice *vbasedev,
- AddressSpace *as, Error **errp)
+bool vfio_attach_device(char *name, VFIODevice *vbasedev,
+ AddressSpace *as, Error **errp)
{
const VFIOIOMMUClass *ops =
VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_LEGACY));
I think vfio_attach_device() can be cleaned up a little further :
ret = ops->attach_device(name, vbasedev, as, errp);
if (ret < 0) {
return ret;
}
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 77bdec276e..ea3b145913 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -908,8 +908,8 @@ static int vfio_device_groupid(VFIODevice *vbasedev, Error
**errp)
* @name and @vbasedev->name are likely to be different depending
* on the type of the device, hence the need for passing @name
*/
-static int vfio_legacy_attach_device(const char *name, VFIODevice *vbasedev,
- AddressSpace *as, Error **errp)
+static bool vfio_legacy_attach_device(const char *name, VFIODevice *vbasedev,
+ AddressSpace *as, Error **errp)
{
int groupid = vfio_device_groupid(vbasedev, errp);
VFIODevice *vbasedev_iter;
@@ -918,27 +918,27 @@ static int vfio_legacy_attach_device(const char *name,
VFIODevice *vbasedev,
int ret;
if (groupid < 0) {
- return groupid;
+ return false;
}
trace_vfio_attach_device(vbasedev->name, groupid);
group = vfio_get_group(groupid, as, errp);
if (!group) {
- return -ENOENT;
+ return false;
}
QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) {
error_setg(errp, "device is already attached");
vfio_put_group(group);
- return -EBUSY;
+ return false;
}
}
ret = vfio_get_device(group, name, vbasedev, errp);
if (ret) {
vfio_get_device() would be the next candidate for cleanup.
vfio_put_group(group);
- return ret;
+ return false;
}
bcontainer = &group->container->bcontainer;
@@ -946,7 +946,7 @@ static int vfio_legacy_attach_device(const char *name,
VFIODevice *vbasedev,
QLIST_INSERT_HEAD(&bcontainer->device_list, vbasedev, container_next);
QLIST_INSERT_HEAD(&vfio_device_list, vbasedev, global_next);
- return ret;
+ return true;
}
static void vfio_legacy_detach_device(VFIODevice *vbasedev)
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 8827ffe636..9aa0dd6d8e 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -301,8 +301,8 @@ error:
return ret;
}
-static int iommufd_cdev_attach(const char *name, VFIODevice *vbasedev,
- AddressSpace *as, Error **errp)
+static bool iommufd_cdev_attach(const char *name, VFIODevice *vbasedev,
+ AddressSpace *as, Error **errp)
{
VFIOContainerBase *bcontainer;
VFIOIOMMUFDContainer *container;
@@ -317,7 +317,7 @@ static int iommufd_cdev_attach(const char *name, VFIODevice
*vbasedev,
if (vbasedev->fd < 0) {
devfd = iommufd_cdev_getfd(vbasedev->sysfsdev, errp);
if (devfd < 0) {
- return devfd;
+ return false;
}
vbasedev->fd = devfd;
} else {
@@ -394,7 +394,6 @@ static int iommufd_cdev_attach(const char *name, VFIODevice
*vbasedev,
memory_listener_register(&bcontainer->listener, bcontainer->space->as);
if (bcontainer->error) {
- ret = -1;
error_propagate_prepend(errp, bcontainer->error,
"memory listener initialization failed: ");
goto err_listener_register;
@@ -433,7 +432,7 @@ found_container:
trace_iommufd_cdev_device_info(vbasedev->name, devfd, vbasedev->num_irqs,
vbasedev->num_regions, vbasedev->flags);
- return 0;
+ return true;
err_listener_register:
iommufd_cdev_ram_block_discard_disable(false);
@@ -446,7 +445,7 @@ err_alloc_ioas:
iommufd_cdev_unbind_and_disconnect(vbasedev);
err_connect_bind:
close(vbasedev->fd);
- return ret;
+ return false;
}
static void iommufd_cdev_detach(VFIODevice *vbasedev)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 64780d1b79..952e4b1a25 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2951,7 +2951,7 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
int i, ret;
bool is_mdev;
char uuid[UUID_STR_LEN];
- char *name;
+ g_autofree char *name = NULL;
if (vbasedev->fd < 0 && !vbasedev->sysfsdev) {
if (!(~vdev->host.domain || ~vdev->host.bus ||
@@ -3001,10 +3001,8 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
name = g_strdup(vbasedev->name);
}
- ret = vfio_attach_device(name, vbasedev,
- pci_device_iommu_address_space(pdev), errp);
- g_free(name);
This change would deserve another patch.
Thanks,
C.
- if (ret) {
+ if (!vfio_attach_device(name, vbasedev,
+ pci_device_iommu_address_space(pdev), errp)) {
goto error;
}
diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
index dcd2365fb3..2bd16096bb 100644
--- a/hw/vfio/platform.c
+++ b/hw/vfio/platform.c
@@ -552,10 +552,9 @@ static int vfio_base_device_init(VFIODevice *vbasedev,
Error **errp)
return ret;
}
- ret = vfio_attach_device(vbasedev->name, vbasedev,
- &address_space_memory, errp);
- if (ret) {
- return ret;
+ if (!vfio_attach_device(vbasedev->name, vbasedev,
+ &address_space_memory, errp)) {
+ return -EINVAL;
}
ret = vfio_populate_device(vbasedev, errp);