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vfio/iommufd: Probe and request hwpt dirty tracking capability

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In preparation to using the dirty tracking UAPI, probe whether the IOMMU
supports dirty tracking. This is done via the data stored in
hiod::caps::hw_caps initialized from GET_HW_INFO.

Qemu doesn't know if VF dirty tracking is supported when allocating
hardware pagetable in iommufd_cdev_autodomains_get(). This is because
VFIODevice migration state hasn't been initialized *yet* hence it can't pick
between VF dirty tracking vs IOMMU dirty tracking. So, if IOMMU supports
dirty tracking it always creates HWPTs with IOMMU_HWPT_ALLOC_DIRTY_TRACKING
even if later on VFIOMigration decides to use VF dirty tracking instead.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[ clg: - Fixed vbasedev->iommu_dirty_tracking assignment in
         iommufd_cdev_autodomains_get()
       - Added warning for heterogeneous dirty page tracking support
	 in iommufd_cdev_autodomains_get() ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
This commit is contained in:
Joao Martins 2024-07-22 22:13:22 +01:00 • committed by Cédric Le Goater
parent 83a4d596a9
commit dddfd8d667
2 changed files with 28 additions and 0 deletions
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2
include/hw/vfio/vfio-common.h
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@ -97,6 +97,7 @@ typedef struct IOMMUFDBackend IOMMUFDBackend;
typedef struct VFIOIOASHwpt {
uint32_t hwpt_id;
uint32_t hwpt_flags;
QLIST_HEAD(, VFIODevice) device_list;
QLIST_ENTRY(VFIOIOASHwpt) next;
} VFIOIOASHwpt;
@ -139,6 +140,7 @@ typedef struct VFIODevice {
OnOffAuto pre_copy_dirty_page_tracking;
bool dirty_pages_supported;
bool dirty_tracking;
bool iommu_dirty_tracking;
HostIOMMUDevice *hiod;
int devid;
IOMMUFDBackend *iommufd;