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| author | Zhenzhong Duan <zhenzhong.duan@intel.com> | 2025-06-04 14:21:12 +0800 |
|---|---|---|
| committer | Cédric Le Goater <clg@redhat.com> | 2025-06-05 10:40:38 +0200 |
| commit | 5c47679cb6e6d07cdc47b611f719df88308673aa (patch) | |
| tree | 7e7d40f606bb9a494e34e80733f90752b56025cb | |
| parent | 44d0acf834b090c2717934983ac7678a602b2da5 (diff) | |
| download | qemu-5c47679cb6e6d07cdc47b611f719df88308673aa.zip qemu-5c47679cb6e6d07cdc47b611f719df88308673aa.tar.gz qemu-5c47679cb6e6d07cdc47b611f719df88308673aa.tar.bz2 | |
backends/iommufd: Add a helper to invalidate user-managed HWPT
This helper passes cache invalidation request from guest to invalidate
stage-1 page table cache in host hardware.
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250604062115.4004200-2-zhenzhong.duan@intel.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
| -rw-r--r-- | backends/iommufd.c | 36 | ||||
| -rw-r--r-- | backends/trace-events | 1 | ||||
| -rw-r--r-- | include/system/iommufd.h | 4 |
3 files changed, 41 insertions, 0 deletions
diff --git a/backends/iommufd.c b/backends/iommufd.c index b73f75c..8bcdb60 100644 --- a/backends/iommufd.c +++ b/backends/iommufd.c @@ -311,6 +311,42 @@ bool iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid, return true; } +bool iommufd_backend_invalidate_cache(IOMMUFDBackend *be, uint32_t id, + uint32_t data_type, uint32_t entry_len, + uint32_t *entry_num, void *data, + Error **errp) +{ + int ret, fd = be->fd; + uint32_t total_entries = *entry_num; + struct iommu_hwpt_invalidate cache = { + .size = sizeof(cache), + .hwpt_id = id, + .data_type = data_type, + .entry_len = entry_len, + .entry_num = total_entries, + .data_uptr = (uintptr_t)data, + }; + + ret = ioctl(fd, IOMMU_HWPT_INVALIDATE, &cache); + trace_iommufd_backend_invalidate_cache(fd, id, data_type, entry_len, + total_entries, cache.entry_num, + (uintptr_t)data, ret ? errno : 0); + *entry_num = cache.entry_num; + + if (ret) { + error_setg_errno(errp, errno, "IOMMU_HWPT_INVALIDATE failed:" + " total %d entries, processed %d entries", + total_entries, cache.entry_num); + } else if (total_entries != cache.entry_num) { + error_setg(errp, "IOMMU_HWPT_INVALIDATE succeed but with unprocessed" + " entries: total %d entries, processed %d entries." + " Kernel BUG?!", total_entries, cache.entry_num); + return false; + } + + return !ret; +} + static int hiod_iommufd_get_cap(HostIOMMUDevice *hiod, int cap, Error **errp) { HostIOMMUDeviceCaps *caps = &hiod->caps; diff --git a/backends/trace-events b/backends/trace-events index 40811a3..7278214 100644 --- a/backends/trace-events +++ b/backends/trace-events @@ -18,3 +18,4 @@ iommufd_backend_alloc_hwpt(int iommufd, uint32_t dev_id, uint32_t pt_id, uint32_ iommufd_backend_free_id(int iommufd, uint32_t id, int ret) " iommufd=%d id=%d (%d)" iommufd_backend_set_dirty(int iommufd, uint32_t hwpt_id, bool start, int ret) " iommufd=%d hwpt=%u enable=%d (%d)" iommufd_backend_get_dirty_bitmap(int iommufd, uint32_t hwpt_id, uint64_t iova, uint64_t size, uint64_t page_size, int ret) " iommufd=%d hwpt=%u iova=0x%"PRIx64" size=0x%"PRIx64" page_size=0x%"PRIx64" (%d)" +iommufd_backend_invalidate_cache(int iommufd, uint32_t id, uint32_t data_type, uint32_t entry_len, uint32_t entry_num, uint32_t done_num, uint64_t data_ptr, int ret) " iommufd=%d id=%u data_type=%u entry_len=%u entry_num=%u done_num=%u data_ptr=0x%"PRIx64" (%d)" diff --git a/include/system/iommufd.h b/include/system/iommufd.h index cbab75b..83ab8e1 100644 --- a/include/system/iommufd.h +++ b/include/system/iommufd.h @@ -61,6 +61,10 @@ bool iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id, uint64_t iova, ram_addr_t size, uint64_t page_size, uint64_t *data, Error **errp); +bool iommufd_backend_invalidate_cache(IOMMUFDBackend *be, uint32_t id, + uint32_t data_type, uint32_t entry_len, + uint32_t *entry_num, void *data, + Error **errp); #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd" #endif |