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vfio/iommufd: Implement VFIOIOMMUClass::query_dirty_bitmap support

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ioctl(iommufd, IOMMU_HWPT_GET_DIRTY_BITMAP, arg) is the UAPI
that fetches the bitmap that tells what was dirty in an IOVA
range.

A single bitmap is allocated and used across all the hwpts
sharing an IOAS which is then used in log_sync() to set Qemu
global bitmaps.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
This commit is contained in:
Joao Martins 2024-07-22 22:13:24 +01:00 • committed by Cédric Le Goater
parent 52ce88229c
commit 7c30710bd9
4 changed files with 62 additions and 0 deletions
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28
hw/vfio/iommufd.c
View file

@ -25,6 +25,7 @@
#include "qemu/cutils.h"
#include "qemu/chardev_open.h"
#include "pci.h"
#include "exec/ram_addr.h"
static int iommufd_cdev_map(const VFIOContainerBase *bcontainer, hwaddr iova,
ram_addr_t size, void *vaddr, bool readonly)
@ -146,6 +147,32 @@ err:
return -EINVAL;
}
static int iommufd_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
VFIOBitmap *vbmap, hwaddr iova,
hwaddr size, Error **errp)
{
VFIOIOMMUFDContainer *container = container_of(bcontainer,
VFIOIOMMUFDContainer,
bcontainer);
unsigned long page_size = qemu_real_host_page_size();
VFIOIOASHwpt *hwpt;
QLIST_FOREACH(hwpt, &container->hwpt_list, next) {
if (!iommufd_hwpt_dirty_tracking(hwpt)) {
continue;
}
if (!iommufd_backend_get_dirty_bitmap(container->be, hwpt->hwpt_id,
iova, size, page_size,
(uint64_t *)vbmap->bitmap,
errp)) {
return -EINVAL;
}
}
return 0;
}
static int iommufd_cdev_getfd(const char *sysfs_path, Error **errp)
{
ERRP_GUARD();
@ -771,6 +798,7 @@ static void vfio_iommu_iommufd_class_init(ObjectClass *klass, void *data)
vioc->detach_device = iommufd_cdev_detach;
vioc->pci_hot_reset = iommufd_cdev_pci_hot_reset;
vioc->set_dirty_page_tracking = iommufd_set_dirty_page_tracking;
vioc->query_dirty_bitmap = iommufd_query_dirty_bitmap;
};
static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,