diff mbox series

[v5,08/10] vfio: Add Error** argument to .get_dirty_bitmap() handler

Message ID 20240506092053.388578-9-clg@redhat.com
State New
Headers show
Series vfio: Improve error reporting (part 2) | expand

Commit Message

Cédric Le Goater May 6, 2024, 9:20 a.m. UTC 
Let the callers do the error reporting. Add documentation while at it.

Signed-off-by: Cédric Le Goater <clg@redhat.com>
---

 Changes in v5:

 - Replaced error_setg() by error_setg_errno() in
   vfio_devices_query_dirty_bitmap() and vfio_legacy_query_dirty_bitmap()
 - ':' -> '-' in vfio_iommu_map_dirty_notify()
 
 include/hw/vfio/vfio-common.h         |  4 +-
 include/hw/vfio/vfio-container-base.h | 17 +++++++-
 hw/vfio/common.c                      | 59 ++++++++++++++++++---------
 hw/vfio/container-base.c              |  5 ++-
 hw/vfio/container.c                   | 14 ++++---
 5 files changed, 68 insertions(+), 31 deletions(-)

Comments

Avihai Horon May 13, 2024, 1:51 p.m. UTC | #1 
On 06/05/2024 12:20, Cédric Le Goater wrote:
> External email: Use caution opening links or attachments
>
>
> Let the callers do the error reporting. Add documentation while at it.
>
> Signed-off-by: Cédric Le Goater <clg@redhat.com>
> ---
>
>   Changes in v5:
>
>   - Replaced error_setg() by error_setg_errno() in
>     vfio_devices_query_dirty_bitmap() and vfio_legacy_query_dirty_bitmap()
>   - ':' -> '-' in vfio_iommu_map_dirty_notify()
>
>   include/hw/vfio/vfio-common.h         |  4 +-
>   include/hw/vfio/vfio-container-base.h | 17 +++++++-
>   hw/vfio/common.c                      | 59 ++++++++++++++++++---------
>   hw/vfio/container-base.c              |  5 ++-
>   hw/vfio/container.c                   | 14 ++++---
>   5 files changed, 68 insertions(+), 31 deletions(-)
>
> diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
> index 46f88493634b5634a9c14a5caa33a463fbf2c50d..68911d36676667352e94a97895828aff4b194b57 100644
> --- a/include/hw/vfio/vfio-common.h
> +++ b/include/hw/vfio/vfio-common.h
> @@ -274,9 +274,9 @@ bool
>   vfio_devices_all_device_dirty_tracking(const VFIOContainerBase *bcontainer);
>   int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>                                       VFIOBitmap *vbmap, hwaddr iova,
> -                                    hwaddr size);
> +                                    hwaddr size, Error **errp);

Nit: while at it, can we fix the line wrap here?

>   int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
> -                          uint64_t size, ram_addr_t ram_addr);
> +                          uint64_t size, ram_addr_t ram_addr, Error **errp);
>
>   /* Returns 0 on success, or a negative errno. */
>   int vfio_device_get_name(VFIODevice *vbasedev, Error **errp);
> diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-container-base.h
> index 326ceea52a2030eec9dad289a9845866c4a8c090..48c92e186231c2c2b548abed08800faff3f430a7 100644
> --- a/include/hw/vfio/vfio-container-base.h
> +++ b/include/hw/vfio/vfio-container-base.h
> @@ -85,7 +85,7 @@ int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
>                                              bool start, Error **errp);
>   int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>                                         VFIOBitmap *vbmap,
> -                                      hwaddr iova, hwaddr size);
> +                                      hwaddr iova, hwaddr size, Error **errp);

Nit: while at it, can we fix the line wrap here?

>
>   void vfio_container_init(VFIOContainerBase *bcontainer,
>                            VFIOAddressSpace *space,
> @@ -138,9 +138,22 @@ struct VFIOIOMMUClass {
>        */
>       int (*set_dirty_page_tracking)(const VFIOContainerBase *bcontainer,
>                                      bool start, Error **errp);
> +    /**
> +     * @query_dirty_bitmap
> +     *
> +     * Get list of dirty pages from container

s/list/bitmap?

> +     *
> +     * @bcontainer: #VFIOContainerBase from which to get dirty pages
> +     * @vbmap: #VFIOBitmap internal bitmap structure
> +     * @iova: iova base address
> +     * @size: size of iova range
> +     * @errp: pointer to Error*, to store an error if it happens.
> +     *
> +     * Returns zero to indicate success and negative for error
> +     */
>       int (*query_dirty_bitmap)(const VFIOContainerBase *bcontainer,
>                                 VFIOBitmap *vbmap,
> -                              hwaddr iova, hwaddr size);
> +                              hwaddr iova, hwaddr size, Error **errp);
>       /* PCI specific */
>       int (*pci_hot_reset)(VFIODevice *vbasedev, bool single);
>
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> index da748563eb33843e93631a5240759964f33162f2..c3d82a9d6e434e33f361e4b96157bf912d5c3a2f 100644
> --- a/hw/vfio/common.c
> +++ b/hw/vfio/common.c
> @@ -1141,7 +1141,7 @@ static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
>
>   int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>                                       VFIOBitmap *vbmap, hwaddr iova,
> -                                    hwaddr size)
> +                                    hwaddr size, Error **errp)

Nit: while at it, can we fix the line wrap here?

>   {
>       VFIODevice *vbasedev;
>       int ret;
> @@ -1150,10 +1150,10 @@ int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>           ret = vfio_device_dma_logging_report(vbasedev, iova, size,
>                                                vbmap->bitmap);
>           if (ret) {
> -            error_report("%s: Failed to get DMA logging report, iova: "
> -                         "0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx
> -                         ", err: %d (%s)",
> -                         vbasedev->name, iova, size, ret, strerror(-ret));
> +            error_setg_errno(errp, -ret,
> +                             "%s: Failed to get DMA logging report, iova: "
> +                             "0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx,
> +                             vbasedev->name, iova, size);
>
>               return ret;
>           }
> @@ -1163,7 +1163,7 @@ int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>   }
>
>   int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
> -                          uint64_t size, ram_addr_t ram_addr)
> +                          uint64_t size, ram_addr_t ram_addr, Error **errp)
>   {
>       bool all_device_dirty_tracking =
>           vfio_devices_all_device_dirty_tracking(bcontainer);
> @@ -1180,13 +1180,17 @@ int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
>
>       ret = vfio_bitmap_alloc(&vbmap, size);
>       if (ret) {
> +        error_setg_errno(errp, -ret,
> +                         "Failed to allocate dirty tracking bitmap");
>           return ret;
>       }
>
>       if (all_device_dirty_tracking) {
> -        ret = vfio_devices_query_dirty_bitmap(bcontainer, &vbmap, iova, size);
> +        ret = vfio_devices_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
> +                                              errp);
>       } else {
> -        ret = vfio_container_query_dirty_bitmap(bcontainer, &vbmap, iova, size);
> +        ret = vfio_container_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
> +                                                errp);
>       }
>
>       if (ret) {
> @@ -1234,12 +1238,13 @@ static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
>       }
>
>       ret = vfio_get_dirty_bitmap(bcontainer, iova, iotlb->addr_mask + 1,
> -                                translated_addr);
> +                                translated_addr, &local_err);
>       if (ret) {
> -        error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
> -                     "0x%"HWADDR_PRIx") = %d (%s)",
> -                     bcontainer, iova, iotlb->addr_mask + 1, ret,
> -                     strerror(-ret));
> +        error_prepend(&local_err,
> +                      "vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
> +                      "0x%"HWADDR_PRIx") failed - ", bcontainer, iova,
> +                      iotlb->addr_mask + 1);
> +        error_report_err(local_err);
>       }
>
>   out_lock:
> @@ -1259,12 +1264,19 @@ static int vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection *section,
>       const ram_addr_t ram_addr = memory_region_get_ram_addr(section->mr) +
>                                   section->offset_within_region;
>       VFIORamDiscardListener *vrdl = opaque;
> +    Error *local_err = NULL;
> +    int ret;
>
>       /*
>        * Sync the whole mapped region (spanning multiple individual mappings)
>        * in one go.
>        */
> -    return vfio_get_dirty_bitmap(vrdl->bcontainer, iova, size, ram_addr);
> +    ret = vfio_get_dirty_bitmap(vrdl->bcontainer, iova, size, ram_addr,
> +                                &local_err);
> +    if (ret) {
> +        error_report_err(local_err);
> +    }
> +    return ret;
>   }
>
>   static int
> @@ -1296,7 +1308,7 @@ vfio_sync_ram_discard_listener_dirty_bitmap(VFIOContainerBase *bcontainer,
>   }
>
>   static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
> -                                  MemoryRegionSection *section)
> +                                  MemoryRegionSection *section, Error **errp)
>   {
>       ram_addr_t ram_addr;
>
> @@ -1327,7 +1339,14 @@ static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
>           }
>           return 0;
>       } else if (memory_region_has_ram_discard_manager(section->mr)) {
> -        return vfio_sync_ram_discard_listener_dirty_bitmap(bcontainer, section);
> +        int ret;
> +
> +        ret = vfio_sync_ram_discard_listener_dirty_bitmap(bcontainer, section);
> +        if (ret) {
> +            error_setg(errp,
> +                       "Failed to sync dirty bitmap with RAM discard listener");
> +            return ret;
> +        }
>       }
>
>       ram_addr = memory_region_get_ram_addr(section->mr) +
> @@ -1335,7 +1354,7 @@ static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
>
>       return vfio_get_dirty_bitmap(bcontainer,
>                      REAL_HOST_PAGE_ALIGN(section->offset_within_address_space),
> -                   int128_get64(section->size), ram_addr);
> +                                 int128_get64(section->size), ram_addr, errp);
>   }
>
>   static void vfio_listener_log_sync(MemoryListener *listener,
> @@ -1344,16 +1363,16 @@ static void vfio_listener_log_sync(MemoryListener *listener,
>       VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
>                                                    listener);
>       int ret;
> +    Error *local_err = NULL;
>
>       if (vfio_listener_skipped_section(section)) {
>           return;
>       }
>
>       if (vfio_devices_all_dirty_tracking(bcontainer)) {
> -        ret = vfio_sync_dirty_bitmap(bcontainer, section);
> +        ret = vfio_sync_dirty_bitmap(bcontainer, section, &local_err);
>           if (ret) {
> -            error_report("vfio: Failed to sync dirty bitmap, err: %d (%s)", ret,
> -                         strerror(-ret));
> +            error_report_err(local_err);
>               vfio_set_migration_error(ret);
>           }
>       }
> diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c
> index 7c0764121d24b02b6c4e66e368d7dff78a6d65aa..8db59881873c3b1edee81104b966af737e5fa6f6 100644
> --- a/hw/vfio/container-base.c
> +++ b/hw/vfio/container-base.c
> @@ -65,10 +65,11 @@ int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
>
>   int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>                                         VFIOBitmap *vbmap,
> -                                      hwaddr iova, hwaddr size)
> +                                      hwaddr iova, hwaddr size, Error **errp)

Nit: while at it, can we fix the line wrap here?

Thanks.

>   {
>       g_assert(bcontainer->ops->query_dirty_bitmap);
> -    return bcontainer->ops->query_dirty_bitmap(bcontainer, vbmap, iova, size);
> +    return bcontainer->ops->query_dirty_bitmap(bcontainer, vbmap, iova, size,
> +                                               errp);
>   }
>
>   void vfio_container_init(VFIOContainerBase *bcontainer, VFIOAddressSpace *space,
> diff --git a/hw/vfio/container.c b/hw/vfio/container.c
> index c35221fbe7dc5453050f97cd186fc958e24f28f7..e00db6546c652c61a352f8e4cd65b212ecfb65bc 100644
> --- a/hw/vfio/container.c
> +++ b/hw/vfio/container.c
> @@ -130,6 +130,7 @@ static int vfio_legacy_dma_unmap(const VFIOContainerBase *bcontainer,
>       };
>       bool need_dirty_sync = false;
>       int ret;
> +    Error *local_err = NULL;
>
>       if (iotlb && vfio_devices_all_running_and_mig_active(bcontainer)) {
>           if (!vfio_devices_all_device_dirty_tracking(bcontainer) &&
> @@ -165,8 +166,9 @@ static int vfio_legacy_dma_unmap(const VFIOContainerBase *bcontainer,
>
>       if (need_dirty_sync) {
>           ret = vfio_get_dirty_bitmap(bcontainer, iova, size,
> -                                    iotlb->translated_addr);
> +                                    iotlb->translated_addr, &local_err);
>           if (ret) {
> +            error_report_err(local_err);
>               return ret;
>           }
>       }
> @@ -236,7 +238,8 @@ vfio_legacy_set_dirty_page_tracking(const VFIOContainerBase *bcontainer,
>
>   static int vfio_legacy_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>                                             VFIOBitmap *vbmap,
> -                                          hwaddr iova, hwaddr size)
> +                                          hwaddr iova, hwaddr size,
> +                                          Error **errp)
>   {
>       const VFIOContainer *container = container_of(bcontainer, VFIOContainer,
>                                                     bcontainer);
> @@ -264,9 +267,10 @@ static int vfio_legacy_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>       ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
>       if (ret) {
>           ret = -errno;
> -        error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
> -                " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
> -                (uint64_t)range->size, errno);
> +        error_setg_errno(errp, errno,
> +                         "Failed to get dirty bitmap for iova: 0x%"PRIx64
> +                         " size: 0x%"PRIx64, (uint64_t)range->iova,
> +                         (uint64_t)range->size);
>       }
>
>       g_free(dbitmap);
> --
> 2.45.0
>
Cédric Le Goater May 14, 2024, 9:05 a.m. UTC | #2 
On 5/13/24 15:51, Avihai Horon wrote:
> 
> On 06/05/2024 12:20, Cédric Le Goater wrote:
>> External email: Use caution opening links or attachments
>>
>>
>> Let the callers do the error reporting. Add documentation while at it.
>>
>> Signed-off-by: Cédric Le Goater <clg@redhat.com>
>> ---
>>
>>   Changes in v5:
>>
>>   - Replaced error_setg() by error_setg_errno() in
>>     vfio_devices_query_dirty_bitmap() and vfio_legacy_query_dirty_bitmap()
>>   - ':' -> '-' in vfio_iommu_map_dirty_notify()
>>
>>   include/hw/vfio/vfio-common.h         |  4 +-
>>   include/hw/vfio/vfio-container-base.h | 17 +++++++-
>>   hw/vfio/common.c                      | 59 ++++++++++++++++++---------
>>   hw/vfio/container-base.c              |  5 ++-
>>   hw/vfio/container.c                   | 14 ++++---
>>   5 files changed, 68 insertions(+), 31 deletions(-)
>>
>> diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
>> index 46f88493634b5634a9c14a5caa33a463fbf2c50d..68911d36676667352e94a97895828aff4b194b57 100644
>> --- a/include/hw/vfio/vfio-common.h
>> +++ b/include/hw/vfio/vfio-common.h
>> @@ -274,9 +274,9 @@ bool
>>   vfio_devices_all_device_dirty_tracking(const VFIOContainerBase *bcontainer);
>>   int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>>                                       VFIOBitmap *vbmap, hwaddr iova,
>> -                                    hwaddr size);
>> +                                    hwaddr size, Error **errp);
> 
> Nit: while at it, can we fix the line wrap here?
> 
>>   int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
>> -                          uint64_t size, ram_addr_t ram_addr);
>> +                          uint64_t size, ram_addr_t ram_addr, Error **errp);
>>
>>   /* Returns 0 on success, or a negative errno. */
>>   int vfio_device_get_name(VFIODevice *vbasedev, Error **errp);
>> diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-container-base.h
>> index 326ceea52a2030eec9dad289a9845866c4a8c090..48c92e186231c2c2b548abed08800faff3f430a7 100644
>> --- a/include/hw/vfio/vfio-container-base.h
>> +++ b/include/hw/vfio/vfio-container-base.h
>> @@ -85,7 +85,7 @@ int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
>>                                              bool start, Error **errp);
>>   int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>>                                         VFIOBitmap *vbmap,
>> -                                      hwaddr iova, hwaddr size);
>> +                                      hwaddr iova, hwaddr size, Error **errp);
> 
> Nit: while at it, can we fix the line wrap here?

do you mean :

int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                       VFIOBitmap *vbmap, hwaddr iova,
                                       hwaddr size, Error **errp);

?

> 
>>
>>   void vfio_container_init(VFIOContainerBase *bcontainer,
>>                            VFIOAddressSpace *space,
>> @@ -138,9 +138,22 @@ struct VFIOIOMMUClass {
>>        */
>>       int (*set_dirty_page_tracking)(const VFIOContainerBase *bcontainer,
>>                                      bool start, Error **errp);
>> +    /**
>> +     * @query_dirty_bitmap
>> +     *
>> +     * Get list of dirty pages from container
> 
> s/list/bitmap?

yep


Thanks,

C.


> 
>> +     *
>> +     * @bcontainer: #VFIOContainerBase from which to get dirty pages
>> +     * @vbmap: #VFIOBitmap internal bitmap structure
>> +     * @iova: iova base address
>> +     * @size: size of iova range
>> +     * @errp: pointer to Error*, to store an error if it happens.
>> +     *
>> +     * Returns zero to indicate success and negative for error
>> +     */
>>       int (*query_dirty_bitmap)(const VFIOContainerBase *bcontainer,
>>                                 VFIOBitmap *vbmap,
>> -                              hwaddr iova, hwaddr size);
>> +                              hwaddr iova, hwaddr size, Error **errp);
>>       /* PCI specific */
>>       int (*pci_hot_reset)(VFIODevice *vbasedev, bool single);
>>
>> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
>> index da748563eb33843e93631a5240759964f33162f2..c3d82a9d6e434e33f361e4b96157bf912d5c3a2f 100644
>> --- a/hw/vfio/common.c
>> +++ b/hw/vfio/common.c
>> @@ -1141,7 +1141,7 @@ static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
>>
>>   int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>>                                       VFIOBitmap *vbmap, hwaddr iova,
>> -                                    hwaddr size)
>> +                                    hwaddr size, Error **errp)
> 
> Nit: while at it, can we fix the line wrap here?
> 
>>   {
>>       VFIODevice *vbasedev;
>>       int ret;
>> @@ -1150,10 +1150,10 @@ int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>>           ret = vfio_device_dma_logging_report(vbasedev, iova, size,
>>                                                vbmap->bitmap);
>>           if (ret) {
>> -            error_report("%s: Failed to get DMA logging report, iova: "
>> -                         "0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx
>> -                         ", err: %d (%s)",
>> -                         vbasedev->name, iova, size, ret, strerror(-ret));
>> +            error_setg_errno(errp, -ret,
>> +                             "%s: Failed to get DMA logging report, iova: "
>> +                             "0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx,
>> +                             vbasedev->name, iova, size);
>>
>>               return ret;
>>           }
>> @@ -1163,7 +1163,7 @@ int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>>   }
>>
>>   int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
>> -                          uint64_t size, ram_addr_t ram_addr)
>> +                          uint64_t size, ram_addr_t ram_addr, Error **errp)
>>   {
>>       bool all_device_dirty_tracking =
>>           vfio_devices_all_device_dirty_tracking(bcontainer);
>> @@ -1180,13 +1180,17 @@ int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
>>
>>       ret = vfio_bitmap_alloc(&vbmap, size);
>>       if (ret) {
>> +        error_setg_errno(errp, -ret,
>> +                         "Failed to allocate dirty tracking bitmap");
>>           return ret;
>>       }
>>
>>       if (all_device_dirty_tracking) {
>> -        ret = vfio_devices_query_dirty_bitmap(bcontainer, &vbmap, iova, size);
>> +        ret = vfio_devices_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
>> +                                              errp);
>>       } else {
>> -        ret = vfio_container_query_dirty_bitmap(bcontainer, &vbmap, iova, size);
>> +        ret = vfio_container_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
>> +                                                errp);
>>       }
>>
>>       if (ret) {
>> @@ -1234,12 +1238,13 @@ static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
>>       }
>>
>>       ret = vfio_get_dirty_bitmap(bcontainer, iova, iotlb->addr_mask + 1,
>> -                                translated_addr);
>> +                                translated_addr, &local_err);
>>       if (ret) {
>> -        error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
>> -                     "0x%"HWADDR_PRIx") = %d (%s)",
>> -                     bcontainer, iova, iotlb->addr_mask + 1, ret,
>> -                     strerror(-ret));
>> +        error_prepend(&local_err,
>> +                      "vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
>> +                      "0x%"HWADDR_PRIx") failed - ", bcontainer, iova,
>> +                      iotlb->addr_mask + 1);
>> +        error_report_err(local_err);
>>       }
>>
>>   out_lock:
>> @@ -1259,12 +1264,19 @@ static int vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection *section,
>>       const ram_addr_t ram_addr = memory_region_get_ram_addr(section->mr) +
>>                                   section->offset_within_region;
>>       VFIORamDiscardListener *vrdl = opaque;
>> +    Error *local_err = NULL;
>> +    int ret;
>>
>>       /*
>>        * Sync the whole mapped region (spanning multiple individual mappings)
>>        * in one go.
>>        */
>> -    return vfio_get_dirty_bitmap(vrdl->bcontainer, iova, size, ram_addr);
>> +    ret = vfio_get_dirty_bitmap(vrdl->bcontainer, iova, size, ram_addr,
>> +                                &local_err);
>> +    if (ret) {
>> +        error_report_err(local_err);
>> +    }
>> +    return ret;
>>   }
>>
>>   static int
>> @@ -1296,7 +1308,7 @@ vfio_sync_ram_discard_listener_dirty_bitmap(VFIOContainerBase *bcontainer,
>>   }
>>
>>   static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
>> -                                  MemoryRegionSection *section)
>> +                                  MemoryRegionSection *section, Error **errp)
>>   {
>>       ram_addr_t ram_addr;
>>
>> @@ -1327,7 +1339,14 @@ static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
>>           }
>>           return 0;
>>       } else if (memory_region_has_ram_discard_manager(section->mr)) {
>> -        return vfio_sync_ram_discard_listener_dirty_bitmap(bcontainer, section);
>> +        int ret;
>> +
>> +        ret = vfio_sync_ram_discard_listener_dirty_bitmap(bcontainer, section);
>> +        if (ret) {
>> +            error_setg(errp,
>> +                       "Failed to sync dirty bitmap with RAM discard listener");
>> +            return ret;
>> +        }
>>       }
>>
>>       ram_addr = memory_region_get_ram_addr(section->mr) +
>> @@ -1335,7 +1354,7 @@ static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
>>
>>       return vfio_get_dirty_bitmap(bcontainer,
>>                      REAL_HOST_PAGE_ALIGN(section->offset_within_address_space),
>> -                   int128_get64(section->size), ram_addr);
>> +                                 int128_get64(section->size), ram_addr, errp);
>>   }
>>
>>   static void vfio_listener_log_sync(MemoryListener *listener,
>> @@ -1344,16 +1363,16 @@ static void vfio_listener_log_sync(MemoryListener *listener,
>>       VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
>>                                                    listener);
>>       int ret;
>> +    Error *local_err = NULL;
>>
>>       if (vfio_listener_skipped_section(section)) {
>>           return;
>>       }
>>
>>       if (vfio_devices_all_dirty_tracking(bcontainer)) {
>> -        ret = vfio_sync_dirty_bitmap(bcontainer, section);
>> +        ret = vfio_sync_dirty_bitmap(bcontainer, section, &local_err);
>>           if (ret) {
>> -            error_report("vfio: Failed to sync dirty bitmap, err: %d (%s)", ret,
>> -                         strerror(-ret));
>> +            error_report_err(local_err);
>>               vfio_set_migration_error(ret);
>>           }
>>       }
>> diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c
>> index 7c0764121d24b02b6c4e66e368d7dff78a6d65aa..8db59881873c3b1edee81104b966af737e5fa6f6 100644
>> --- a/hw/vfio/container-base.c
>> +++ b/hw/vfio/container-base.c
>> @@ -65,10 +65,11 @@ int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
>>
>>   int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>>                                         VFIOBitmap *vbmap,
>> -                                      hwaddr iova, hwaddr size)
>> +                                      hwaddr iova, hwaddr size, Error **errp)
> 
> Nit: while at it, can we fix the line wrap here?
> 
> Thanks.
> 
>>   {
>>       g_assert(bcontainer->ops->query_dirty_bitmap);
>> -    return bcontainer->ops->query_dirty_bitmap(bcontainer, vbmap, iova, size);
>> +    return bcontainer->ops->query_dirty_bitmap(bcontainer, vbmap, iova, size,
>> +                                               errp);
>>   }
>>
>>   void vfio_container_init(VFIOContainerBase *bcontainer, VFIOAddressSpace *space,
>> diff --git a/hw/vfio/container.c b/hw/vfio/container.c
>> index c35221fbe7dc5453050f97cd186fc958e24f28f7..e00db6546c652c61a352f8e4cd65b212ecfb65bc 100644
>> --- a/hw/vfio/container.c
>> +++ b/hw/vfio/container.c
>> @@ -130,6 +130,7 @@ static int vfio_legacy_dma_unmap(const VFIOContainerBase *bcontainer,
>>       };
>>       bool need_dirty_sync = false;
>>       int ret;
>> +    Error *local_err = NULL;
>>
>>       if (iotlb && vfio_devices_all_running_and_mig_active(bcontainer)) {
>>           if (!vfio_devices_all_device_dirty_tracking(bcontainer) &&
>> @@ -165,8 +166,9 @@ static int vfio_legacy_dma_unmap(const VFIOContainerBase *bcontainer,
>>
>>       if (need_dirty_sync) {
>>           ret = vfio_get_dirty_bitmap(bcontainer, iova, size,
>> -                                    iotlb->translated_addr);
>> +                                    iotlb->translated_addr, &local_err);
>>           if (ret) {
>> +            error_report_err(local_err);
>>               return ret;
>>           }
>>       }
>> @@ -236,7 +238,8 @@ vfio_legacy_set_dirty_page_tracking(const VFIOContainerBase *bcontainer,
>>
>>   static int vfio_legacy_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>>                                             VFIOBitmap *vbmap,
>> -                                          hwaddr iova, hwaddr size)
>> +                                          hwaddr iova, hwaddr size,
>> +                                          Error **errp)
>>   {
>>       const VFIOContainer *container = container_of(bcontainer, VFIOContainer,
>>                                                     bcontainer);
>> @@ -264,9 +267,10 @@ static int vfio_legacy_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
>>       ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
>>       if (ret) {
>>           ret = -errno;
>> -        error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
>> -                " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
>> -                (uint64_t)range->size, errno);
>> +        error_setg_errno(errp, errno,
>> +                         "Failed to get dirty bitmap for iova: 0x%"PRIx64
>> +                         " size: 0x%"PRIx64, (uint64_t)range->iova,
>> +                         (uint64_t)range->size);
>>       }
>>
>>       g_free(dbitmap);
>> -- 
>> 2.45.0
>>
>
diff mbox series

Patch

diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 46f88493634b5634a9c14a5caa33a463fbf2c50d..68911d36676667352e94a97895828aff4b194b57 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -274,9 +274,9 @@  bool
 vfio_devices_all_device_dirty_tracking(const VFIOContainerBase *bcontainer);
 int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                     VFIOBitmap *vbmap, hwaddr iova,
-                                    hwaddr size);
+                                    hwaddr size, Error **errp);
 int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
-                          uint64_t size, ram_addr_t ram_addr);
+                          uint64_t size, ram_addr_t ram_addr, Error **errp);
 
 /* Returns 0 on success, or a negative errno. */
 int vfio_device_get_name(VFIODevice *vbasedev, Error **errp);
diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-container-base.h
index 326ceea52a2030eec9dad289a9845866c4a8c090..48c92e186231c2c2b548abed08800faff3f430a7 100644
--- a/include/hw/vfio/vfio-container-base.h
+++ b/include/hw/vfio/vfio-container-base.h
@@ -85,7 +85,7 @@  int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
                                            bool start, Error **errp);
 int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                       VFIOBitmap *vbmap,
-                                      hwaddr iova, hwaddr size);
+                                      hwaddr iova, hwaddr size, Error **errp);
 
 void vfio_container_init(VFIOContainerBase *bcontainer,
                          VFIOAddressSpace *space,
@@ -138,9 +138,22 @@  struct VFIOIOMMUClass {
      */
     int (*set_dirty_page_tracking)(const VFIOContainerBase *bcontainer,
                                    bool start, Error **errp);
+    /**
+     * @query_dirty_bitmap
+     *
+     * Get list of dirty pages from container
+     *
+     * @bcontainer: #VFIOContainerBase from which to get dirty pages
+     * @vbmap: #VFIOBitmap internal bitmap structure
+     * @iova: iova base address
+     * @size: size of iova range
+     * @errp: pointer to Error*, to store an error if it happens.
+     *
+     * Returns zero to indicate success and negative for error
+     */
     int (*query_dirty_bitmap)(const VFIOContainerBase *bcontainer,
                               VFIOBitmap *vbmap,
-                              hwaddr iova, hwaddr size);
+                              hwaddr iova, hwaddr size, Error **errp);
     /* PCI specific */
     int (*pci_hot_reset)(VFIODevice *vbasedev, bool single);
 
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index da748563eb33843e93631a5240759964f33162f2..c3d82a9d6e434e33f361e4b96157bf912d5c3a2f 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1141,7 +1141,7 @@  static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
 
 int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                     VFIOBitmap *vbmap, hwaddr iova,
-                                    hwaddr size)
+                                    hwaddr size, Error **errp)
 {
     VFIODevice *vbasedev;
     int ret;
@@ -1150,10 +1150,10 @@  int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
         ret = vfio_device_dma_logging_report(vbasedev, iova, size,
                                              vbmap->bitmap);
         if (ret) {
-            error_report("%s: Failed to get DMA logging report, iova: "
-                         "0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx
-                         ", err: %d (%s)",
-                         vbasedev->name, iova, size, ret, strerror(-ret));
+            error_setg_errno(errp, -ret,
+                             "%s: Failed to get DMA logging report, iova: "
+                             "0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx,
+                             vbasedev->name, iova, size);
 
             return ret;
         }
@@ -1163,7 +1163,7 @@  int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
 }
 
 int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
-                          uint64_t size, ram_addr_t ram_addr)
+                          uint64_t size, ram_addr_t ram_addr, Error **errp)
 {
     bool all_device_dirty_tracking =
         vfio_devices_all_device_dirty_tracking(bcontainer);
@@ -1180,13 +1180,17 @@  int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
 
     ret = vfio_bitmap_alloc(&vbmap, size);
     if (ret) {
+        error_setg_errno(errp, -ret,
+                         "Failed to allocate dirty tracking bitmap");
         return ret;
     }
 
     if (all_device_dirty_tracking) {
-        ret = vfio_devices_query_dirty_bitmap(bcontainer, &vbmap, iova, size);
+        ret = vfio_devices_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
+                                              errp);
     } else {
-        ret = vfio_container_query_dirty_bitmap(bcontainer, &vbmap, iova, size);
+        ret = vfio_container_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
+                                                errp);
     }
 
     if (ret) {
@@ -1234,12 +1238,13 @@  static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
     }
 
     ret = vfio_get_dirty_bitmap(bcontainer, iova, iotlb->addr_mask + 1,
-                                translated_addr);
+                                translated_addr, &local_err);
     if (ret) {
-        error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
-                     "0x%"HWADDR_PRIx") = %d (%s)",
-                     bcontainer, iova, iotlb->addr_mask + 1, ret,
-                     strerror(-ret));
+        error_prepend(&local_err,
+                      "vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
+                      "0x%"HWADDR_PRIx") failed - ", bcontainer, iova,
+                      iotlb->addr_mask + 1);
+        error_report_err(local_err);
     }
 
 out_lock:
@@ -1259,12 +1264,19 @@  static int vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection *section,
     const ram_addr_t ram_addr = memory_region_get_ram_addr(section->mr) +
                                 section->offset_within_region;
     VFIORamDiscardListener *vrdl = opaque;
+    Error *local_err = NULL;
+    int ret;
 
     /*
      * Sync the whole mapped region (spanning multiple individual mappings)
      * in one go.
      */
-    return vfio_get_dirty_bitmap(vrdl->bcontainer, iova, size, ram_addr);
+    ret = vfio_get_dirty_bitmap(vrdl->bcontainer, iova, size, ram_addr,
+                                &local_err);
+    if (ret) {
+        error_report_err(local_err);
+    }
+    return ret;
 }
 
 static int
@@ -1296,7 +1308,7 @@  vfio_sync_ram_discard_listener_dirty_bitmap(VFIOContainerBase *bcontainer,
 }
 
 static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
-                                  MemoryRegionSection *section)
+                                  MemoryRegionSection *section, Error **errp)
 {
     ram_addr_t ram_addr;
 
@@ -1327,7 +1339,14 @@  static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
         }
         return 0;
     } else if (memory_region_has_ram_discard_manager(section->mr)) {
-        return vfio_sync_ram_discard_listener_dirty_bitmap(bcontainer, section);
+        int ret;
+
+        ret = vfio_sync_ram_discard_listener_dirty_bitmap(bcontainer, section);
+        if (ret) {
+            error_setg(errp,
+                       "Failed to sync dirty bitmap with RAM discard listener");
+            return ret;
+        }
     }
 
     ram_addr = memory_region_get_ram_addr(section->mr) +
@@ -1335,7 +1354,7 @@  static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
 
     return vfio_get_dirty_bitmap(bcontainer,
                    REAL_HOST_PAGE_ALIGN(section->offset_within_address_space),
-                   int128_get64(section->size), ram_addr);
+                                 int128_get64(section->size), ram_addr, errp);
 }
 
 static void vfio_listener_log_sync(MemoryListener *listener,
@@ -1344,16 +1363,16 @@  static void vfio_listener_log_sync(MemoryListener *listener,
     VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
                                                  listener);
     int ret;
+    Error *local_err = NULL;
 
     if (vfio_listener_skipped_section(section)) {
         return;
     }
 
     if (vfio_devices_all_dirty_tracking(bcontainer)) {
-        ret = vfio_sync_dirty_bitmap(bcontainer, section);
+        ret = vfio_sync_dirty_bitmap(bcontainer, section, &local_err);
         if (ret) {
-            error_report("vfio: Failed to sync dirty bitmap, err: %d (%s)", ret,
-                         strerror(-ret));
+            error_report_err(local_err);
             vfio_set_migration_error(ret);
         }
     }
diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c
index 7c0764121d24b02b6c4e66e368d7dff78a6d65aa..8db59881873c3b1edee81104b966af737e5fa6f6 100644
--- a/hw/vfio/container-base.c
+++ b/hw/vfio/container-base.c
@@ -65,10 +65,11 @@  int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
 
 int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                       VFIOBitmap *vbmap,
-                                      hwaddr iova, hwaddr size)
+                                      hwaddr iova, hwaddr size, Error **errp)
 {
     g_assert(bcontainer->ops->query_dirty_bitmap);
-    return bcontainer->ops->query_dirty_bitmap(bcontainer, vbmap, iova, size);
+    return bcontainer->ops->query_dirty_bitmap(bcontainer, vbmap, iova, size,
+                                               errp);
 }
 
 void vfio_container_init(VFIOContainerBase *bcontainer, VFIOAddressSpace *space,
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index c35221fbe7dc5453050f97cd186fc958e24f28f7..e00db6546c652c61a352f8e4cd65b212ecfb65bc 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -130,6 +130,7 @@  static int vfio_legacy_dma_unmap(const VFIOContainerBase *bcontainer,
     };
     bool need_dirty_sync = false;
     int ret;
+    Error *local_err = NULL;
 
     if (iotlb && vfio_devices_all_running_and_mig_active(bcontainer)) {
         if (!vfio_devices_all_device_dirty_tracking(bcontainer) &&
@@ -165,8 +166,9 @@  static int vfio_legacy_dma_unmap(const VFIOContainerBase *bcontainer,
 
     if (need_dirty_sync) {
         ret = vfio_get_dirty_bitmap(bcontainer, iova, size,
-                                    iotlb->translated_addr);
+                                    iotlb->translated_addr, &local_err);
         if (ret) {
+            error_report_err(local_err);
             return ret;
         }
     }
@@ -236,7 +238,8 @@  vfio_legacy_set_dirty_page_tracking(const VFIOContainerBase *bcontainer,
 
 static int vfio_legacy_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                           VFIOBitmap *vbmap,
-                                          hwaddr iova, hwaddr size)
+                                          hwaddr iova, hwaddr size,
+                                          Error **errp)
 {
     const VFIOContainer *container = container_of(bcontainer, VFIOContainer,
                                                   bcontainer);
@@ -264,9 +267,10 @@  static int vfio_legacy_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
     ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
     if (ret) {
         ret = -errno;
-        error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
-                " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
-                (uint64_t)range->size, errno);
+        error_setg_errno(errp, errno,
+                         "Failed to get dirty bitmap for iova: 0x%"PRIx64
+                         " size: 0x%"PRIx64, (uint64_t)range->iova,
+                         (uint64_t)range->size);
     }
 
     g_free(dbitmap);