motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-03 07:43:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

backends/iommufd: Add a helper to invalidate user-managed HWPT

Browse source 
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>
This commit is contained in:
Zhenzhong Duan 2025-06-04 14:21:12 +08:00 • committed by Cédric Le Goater
parent 44d0acf834
commit 5c47679cb6
3 changed files with 41 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

36
backends/iommufd.c
View file

@ -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;

1
backends/trace-events
View file

@ -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)"

4
include/system/iommufd.h
View file

@ -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