[Intel-gfx] [PATCH v3 18/28] drm/i915/gvt: switch from ->track_flush_slot() to ->track_remove_region()

Sean Christopherson
2023-05-13T00:36:43Z

From: Yan Zhao <yan.y.zhao@intel.com>

Switch from the poorly named and flawed ->track_flush_slot() to the newly
introduced ->track_remove_region(). From KVMGT's perspective, the two
hooks are functionally equivalent, the only difference being that
->track_remove_region() is called only when KVM is 100% certain the
memory region will be removed, i.e. is invoked slightly later in KVM's
memslot modification flow.

Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
[sean: handle name change, massage changelog, rebase]
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
drivers/gpu/drm/i915/gvt/kvmgt.c | 21 +++++++++------------
1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index c309a77f495f..2e65901270ca 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -108,9 +108,8 @@ struct gvt_dma {

static void kvmgt_page_track_write(gpa_t gpa, const u8 *val, int len,
struct kvm_page_track_notifier_node *node);
-static void kvmgt_page_track_flush_slot(struct kvm *kvm,
- struct kvm_memory_slot *slot,
- struct kvm_page_track_notifier_node *node);
+static void kvmgt_page_track_remove_region(gfn_t gfn, unsigned long nr_pages,
+ struct kvm_page_track_notifier_node *node);

static ssize_t intel_vgpu_show_description(struct mdev_type *mtype, char *buf)
{
@@ -665,7 +664,7 @@ static int intel_vgpu_open_device(struct vfio_device *vfio_dev)
return -EEXIST;

vgpu->track_node.track_write = kvmgt_page_track_write;
- vgpu->track_node.track_flush_slot = kvmgt_page_track_flush_slot;
+ vgpu->track_node.track_remove_region = kvmgt_page_track_remove_region;
kvm_get_kvm(vgpu->vfio_device.kvm);
kvm_page_track_register_notifier(vgpu->vfio_device.kvm,
&vgpu->track_node);
@@ -1616,22 +1615,20 @@ static void kvmgt_page_track_write(gpa_t gpa, const u8 *val, int len,
mutex_unlock(&info->vgpu_lock);
}

-static void kvmgt_page_track_flush_slot(struct kvm *kvm,
- struct kvm_memory_slot *slot,
- struct kvm_page_track_notifier_node *node)
+static void kvmgt_page_track_remove_region(gfn_t gfn, unsigned long nr_pages,
+ struct kvm_page_track_notifier_node *node)
{
unsigned long i;
- gfn_t gfn;
struct intel_vgpu *info =
container_of(node, struct intel_vgpu, track_node);

mutex_lock(&info->vgpu_lock);

- for (i = 0; i < slot->npages; i++) {
- gfn = slot->base_gfn + i;
- if (kvmgt_gfn_is_write_protected(info, gfn))
- kvmgt_protect_table_del(info, gfn);
+ for (i = 0; i < nr_pages; i++) {
+ if (kvmgt_gfn_is_write_protected(info, gfn + i))
+ kvmgt_protect_table_del(info, gfn + i);
}
+
mutex_unlock(&info->vgpu_lock);
}

--
2.40.1.606.ga4b1b128d6-goog