[PATCH 16/27] drm/i915/gvt: switch from ->track_flush_slot() to ->track_remove_region()

Sean Christopherson
2022-12-23T01:00:22Z

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]
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
drivers/gpu/drm/i915/gvt/kvmgt.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 3c59e7cd75d9..9f251bc00a7e 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)
{
@@ -690,7 +689,7 @@ static int intel_vgpu_open_device(struct vfio_device *vfio_dev)
gvt_cache_init(vgpu);

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);
@@ -1647,20 +1646,17 @@ 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->gfn_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->gfn_lock);
}
--
2.39.0.314.g84b9a713c41-goog