From: Avihai Horon <avihaih@nvidia.com>
To: "Cédric Le Goater" <clg@redhat.com>, qemu-devel@nongnu.org
Cc: "Peter Xu" <peterx@redhat.com>, "Fabiano Rosas" <farosas@suse.de>,
"Alex Williamson" <alex.williamson@redhat.com>,
"Philippe Mathieu-Daudé" <philmd@linaro.org>,
"Markus Armbruster" <armbru@redhat.com>
Subject: Re: [PATCH v5 01/10] vfio: Add Error** argument to .set_dirty_page_tracking() handler
Date: Wed, 15 May 2024 15:17:14 +0300 [thread overview]
Message-ID: <020da629-845f-4599-92da-33cf41ad92f4@nvidia.com> (raw)
In-Reply-To: <2ef7b720-31a8-48b6-b825-a64b3fe87a1f@redhat.com>
On 13/05/2024 19:27, Cédric Le Goater wrote:
> External email: Use caution opening links or attachments
>
>
> On 5/13/24 15:03, Avihai Horon wrote:
>> Hi Cedric,
>>
>> On 06/05/2024 12:20, Cédric Le Goater wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> We will use the Error object to improve error reporting in the
>>> .log_global*() handlers of VFIO. Add documentation while at it.
>>
>> First of all, I think commit 3688fec8923 ("memory: Add Error**
>> argument to .log_global_start() handler") forgot to set errp in
>> vfio_listener_log_global_start() in case of error.
>
> yes. This is unfortunate. There has been a few respins, the series
> was split and I was hoping to upstream this part sooner. My bad.
>
>> This causes a null pointer de-reference if DPT start fails.
>> Maybe add a fix for that in the beginning of this series, or as a
>> stand-alone fix?
>
> Since it is fixed by patch 1+2 of this series, we should be fine ?
A fix could be useful to be backported to QEMU 9.0, no?
>
>> Back to this patch, personally, I found the split of patch #1 and #2
>> a bit confusing.
>> Maybe consider squashing patch #1 and #2 so container based and
>> device based DPT start/stop are changed in the same patch? Like you
>> did in patch #8?
>> Whatever you think is better.
>
> ok. Let's see how v5 goes. I might just send a PR with it if
> no major changes are requested.
>
>>
>> In any case:
>> Reviewed-by: Avihai Horon <avihaih@nvidia.com>
>
>
> Thanks,
>
> C.
>
>
>>
>>>
>>> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>>> Signed-off-by: Cédric Le Goater <clg@redhat.com>
>>> ---
>>>
>>> Changes in v5:
>>>
>>> - Fixed typo in set_dirty_page_tracking documentation
>>>
>>> include/hw/vfio/vfio-container-base.h | 18 ++++++++++++++++--
>>> hw/vfio/common.c | 4 ++--
>>> hw/vfio/container-base.c | 4 ++--
>>> hw/vfio/container.c | 6 +++---
>>> 4 files changed, 23 insertions(+), 9 deletions(-)
>>>
>>> diff --git a/include/hw/vfio/vfio-container-base.h
>>> b/include/hw/vfio/vfio-container-base.h
>>> index
>>> 3582d5f97a37877b2adfc0d0b06996c82403f8b7..326ceea52a2030eec9dad289a9845866c4a8c090
>>> 100644
>>> --- a/include/hw/vfio/vfio-container-base.h
>>> +++ b/include/hw/vfio/vfio-container-base.h
>>> @@ -82,7 +82,7 @@ int
>>> vfio_container_add_section_window(VFIOContainerBase *bcontainer,
>>> void vfio_container_del_section_window(VFIOContainerBase *bcontainer,
>>> MemoryRegionSection *section);
>>> int vfio_container_set_dirty_page_tracking(VFIOContainerBase
>>> *bcontainer,
>>> - bool start);
>>> + bool start, Error **errp);
>>> int vfio_container_query_dirty_bitmap(const VFIOContainerBase
>>> *bcontainer,
>>> VFIOBitmap *vbmap,
>>> hwaddr iova, hwaddr size);
>>> @@ -121,9 +121,23 @@ struct VFIOIOMMUClass {
>>> int (*attach_device)(const char *name, VFIODevice *vbasedev,
>>> AddressSpace *as, Error **errp);
>>> void (*detach_device)(VFIODevice *vbasedev);
>>> +
>>> /* migration feature */
>>> +
>>> + /**
>>> + * @set_dirty_page_tracking
>>> + *
>>> + * Start or stop dirty pages tracking on VFIO container
>>> + *
>>> + * @bcontainer: #VFIOContainerBase on which to de/activate dirty
>>> + * page tracking
>>> + * @start: indicates whether to start or stop dirty pages tracking
>>> + * @errp: pointer to Error*, to store an error if it happens.
>>> + *
>>> + * Returns zero to indicate success and negative for error
>>> + */
>>> int (*set_dirty_page_tracking)(const VFIOContainerBase
>>> *bcontainer,
>>> - bool start);
>>> + bool start, Error **errp);
>>> int (*query_dirty_bitmap)(const VFIOContainerBase *bcontainer,
>>> VFIOBitmap *vbmap,
>>> hwaddr iova, hwaddr size);
>>> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
>>> index
>>> 8f9cbdc0264044ce587877a7d19d14b28527291b..485e53916491f1164d29e739fb7106c0c77df737
>>> 100644
>>> --- a/hw/vfio/common.c
>>> +++ b/hw/vfio/common.c
>>> @@ -1076,7 +1076,7 @@ static bool
>>> vfio_listener_log_global_start(MemoryListener *listener,
>>> if (vfio_devices_all_device_dirty_tracking(bcontainer)) {
>>> ret = vfio_devices_dma_logging_start(bcontainer);
>>> } else {
>>> - ret = vfio_container_set_dirty_page_tracking(bcontainer,
>>> true);
>>> + ret = vfio_container_set_dirty_page_tracking(bcontainer,
>>> true, NULL);
>>> }
>>>
>>> if (ret) {
>>> @@ -1096,7 +1096,7 @@ static void
>>> vfio_listener_log_global_stop(MemoryListener *listener)
>>> if (vfio_devices_all_device_dirty_tracking(bcontainer)) {
>>> vfio_devices_dma_logging_stop(bcontainer);
>>> } else {
>>> - ret = vfio_container_set_dirty_page_tracking(bcontainer,
>>> false);
>>> + ret = vfio_container_set_dirty_page_tracking(bcontainer,
>>> false, NULL);
>>> }
>>>
>>> if (ret) {
>>> diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c
>>> index
>>> 913ae49077c4f09b7b27517c1231cfbe4befb7fb..7c0764121d24b02b6c4e66e368d7dff78a6d65aa
>>> 100644
>>> --- a/hw/vfio/container-base.c
>>> +++ b/hw/vfio/container-base.c
>>> @@ -53,14 +53,14 @@ void
>>> vfio_container_del_section_window(VFIOContainerBase *bcontainer,
>>> }
>>>
>>> int vfio_container_set_dirty_page_tracking(VFIOContainerBase
>>> *bcontainer,
>>> - bool start)
>>> + bool start, Error **errp)
>>> {
>>> if (!bcontainer->dirty_pages_supported) {
>>> return 0;
>>> }
>>>
>>> g_assert(bcontainer->ops->set_dirty_page_tracking);
>>> - return bcontainer->ops->set_dirty_page_tracking(bcontainer,
>>> start);
>>> + return bcontainer->ops->set_dirty_page_tracking(bcontainer,
>>> start, errp);
>>> }
>>>
>>> int vfio_container_query_dirty_bitmap(const VFIOContainerBase
>>> *bcontainer,
>>> diff --git a/hw/vfio/container.c b/hw/vfio/container.c
>>> index
>>> 77bdec276ec49cb9cd767c0de42ec801b4421572..c35221fbe7dc5453050f97cd186fc958e24f28f7
>>> 100644
>>> --- a/hw/vfio/container.c
>>> +++ b/hw/vfio/container.c
>>> @@ -209,7 +209,7 @@ static int vfio_legacy_dma_map(const
>>> VFIOContainerBase *bcontainer, hwaddr iova,
>>>
>>> static int
>>> vfio_legacy_set_dirty_page_tracking(const VFIOContainerBase
>>> *bcontainer,
>>> - bool start)
>>> + bool start, Error **errp)
>>> {
>>> const VFIOContainer *container = container_of(bcontainer,
>>> VFIOContainer,
>>> bcontainer);
>>> @@ -227,8 +227,8 @@ vfio_legacy_set_dirty_page_tracking(const
>>> VFIOContainerBase *bcontainer,
>>> ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
>>> if (ret) {
>>> ret = -errno;
>>> - error_report("Failed to set dirty tracking flag 0x%x errno:
>>> %d",
>>> - dirty.flags, errno);
>>> + error_setg_errno(errp, errno, "Failed to set dirty tracking
>>> flag 0x%x",
>>> + dirty.flags);
>>> }
>>>
>>> return ret;
>>> --
>>> 2.45.0
>>>
>>
>
next prev parent reply other threads:[~2024-05-15 12:23 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-06 9:20 [PATCH v5 00/10] vfio: Improve error reporting (part 2) Cédric Le Goater
2024-05-06 9:20 ` [PATCH v5 01/10] vfio: Add Error** argument to .set_dirty_page_tracking() handler Cédric Le Goater
2024-05-13 13:03 ` Avihai Horon
2024-05-13 16:27 ` Cédric Le Goater
2024-05-15 12:17 ` Avihai Horon [this message]
2024-05-15 12:25 ` Cédric Le Goater
2024-05-15 12:29 ` Avihai Horon
2024-05-15 12:36 ` Cédric Le Goater
2024-05-15 12:49 ` Avihai Horon
2024-05-06 9:20 ` [PATCH v5 02/10] vfio: Add Error** argument to vfio_devices_dma_logging_start() Cédric Le Goater
2024-05-13 13:08 ` Avihai Horon
2024-05-13 16:49 ` Cédric Le Goater
2024-05-06 9:20 ` [PATCH v5 03/10] vfio: Extend migration_file_set_error() with Error** argument Cédric Le Goater
2024-05-13 13:14 ` Avihai Horon
2024-05-13 16:51 ` Cédric Le Goater
2024-05-13 22:19 ` Fabiano Rosas
2024-05-06 9:20 ` [PATCH v5 04/10] vfio: Use new Error** argument in vfio_save_setup() Cédric Le Goater
2024-05-13 13:21 ` Avihai Horon
2024-05-14 7:57 ` Cédric Le Goater
2024-05-06 9:20 ` [PATCH v5 05/10] vfio: Add Error** argument to .vfio_save_config() handler Cédric Le Goater
2024-05-13 13:30 ` Avihai Horon
2024-05-14 8:50 ` Cédric Le Goater
2024-05-06 9:20 ` [PATCH v5 06/10] vfio: Reverse test on vfio_get_dirty_bitmap() Cédric Le Goater
2024-05-13 13:42 ` Avihai Horon
2024-05-14 8:55 ` Cédric Le Goater
2024-05-06 9:20 ` [PATCH v5 07/10] memory: Add Error** argument to memory_get_xlat_addr() Cédric Le Goater
2024-05-13 13:44 ` Avihai Horon
2024-05-14 8:57 ` Cédric Le Goater
2024-05-06 9:20 ` [PATCH v5 08/10] vfio: Add Error** argument to .get_dirty_bitmap() handler Cédric Le Goater
2024-05-13 13:51 ` Avihai Horon
2024-05-14 9:05 ` Cédric Le Goater
2024-05-06 9:20 ` [PATCH v5 09/10] vfio: Also trace event failures in vfio_save_complete_precopy() Cédric Le Goater
2024-05-13 13:54 ` Avihai Horon
2024-05-06 9:20 ` [PATCH v5 10/10] vfio: Extend vfio_set_migration_error() with Error* argument Cédric Le Goater
2024-05-13 14:26 ` Avihai Horon
2024-05-14 11:20 ` Cédric Le Goater
2024-05-14 14:35 ` Cédric Le Goater
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