[PATCH 21/27] KVM: x86/mmu: Rename page-track APIs to reflect the new reality

Sean Christopherson
2022-12-23T01:00:48Z

Rename the page-track APIs to capture that they're all about tracking
writes, now that the facade of supporting multiple modes is gone.

Opportunstically replace "slot" with "gfn" in anticipation of removing
the @slot param from the external APIs.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/include/asm/kvm_page_track.h | 8 ++++----
arch/x86/kvm/mmu/mmu.c | 8 ++++----
arch/x86/kvm/mmu/page_track.c | 21 +++++++++------------
arch/x86/kvm/mmu/page_track.h | 4 ++--
drivers/gpu/drm/i915/gvt/kvmgt.c | 4 ++--
5 files changed, 21 insertions(+), 24 deletions(-)

diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h
index 42a4ae451d36..20055064793a 100644
--- a/arch/x86/include/asm/kvm_page_track.h
+++ b/arch/x86/include/asm/kvm_page_track.h
@@ -43,10 +43,10 @@ struct kvm_page_track_notifier_node {
struct kvm_page_track_notifier_node *node);
};

-void kvm_slot_page_track_add_page(struct kvm *kvm,
- struct kvm_memory_slot *slot, gfn_t gfn);
-void kvm_slot_page_track_remove_page(struct kvm *kvm,
- struct kvm_memory_slot *slot, gfn_t gfn);
+void kvm_write_track_add_gfn(struct kvm *kvm,
+ struct kvm_memory_slot *slot, gfn_t gfn);
+void kvm_write_track_remove_gfn(struct kvm *kvm, struct kvm_memory_slot *slot,
+ gfn_t gfn);

#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING
enum pg_level kvm_page_track_max_mapping_level(struct kvm *kvm, gfn_t gfn,
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index ffcfc75cd4c1..b4cc762cfe11 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -807,7 +807,7 @@ static void account_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp)

/* the non-leaf shadow pages are keeping readonly. */
if (sp->role.level > PG_LEVEL_4K)
- return kvm_slot_page_track_add_page(kvm, slot, gfn);
+ return kvm_write_track_add_gfn(kvm, slot, gfn);

kvm_mmu_gfn_disallow_lpage(slot, gfn);

@@ -853,7 +853,7 @@ static void unaccount_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp)
slots = kvm_memslots_for_spte_role(kvm, sp->role);
slot = __gfn_to_memslot(slots, gfn);
if (sp->role.level > PG_LEVEL_4K)
- return kvm_slot_page_track_remove_page(kvm, slot, gfn);
+ return kvm_write_track_remove_gfn(kvm, slot, gfn);

kvm_mmu_gfn_allow_lpage(slot, gfn);
}
@@ -2725,7 +2725,7 @@ int mmu_try_to_unsync_pages(struct kvm *kvm, const struct kvm_memory_slot *slot,
* track machinery is used to write-protect upper-level shadow pages,
* i.e. this guards the role.level == 4K assertion below!
*/
- if (kvm_slot_page_track_is_active(kvm, slot, gfn))
+ if (kvm_gfn_is_write_tracked(kvm, slot, gfn))
return -EPERM;

/*
@@ -4135,7 +4135,7 @@ static bool page_fault_handle_page_track(struct kvm_vcpu *vcpu,
* guest is writing the page which is write tracked which can
* not be fixed by page fault handler.
*/
- if (kvm_slot_page_track_is_active(vcpu->kvm, fault->slot, fault->gfn))
+ if (kvm_gfn_is_write_tracked(vcpu->kvm, fault->slot, fault->gfn))
return true;

return false;
diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
index 4077aa6d6ff4..1eb516119fdb 100644
--- a/arch/x86/kvm/mmu/page_track.c
+++ b/arch/x86/kvm/mmu/page_track.c
@@ -83,10 +83,9 @@ static void update_gfn_write_track(struct kvm_memory_slot *slot, gfn_t gfn,
* @slot: the @gfn belongs to.
* @gfn: the guest page.
*/
-void kvm_slot_page_track_add_page(struct kvm *kvm,
- struct kvm_memory_slot *slot, gfn_t gfn)
+void kvm_write_track_add_gfn(struct kvm *kvm, struct kvm_memory_slot *slot,
+ gfn_t gfn)
{
-
if (WARN_ON(!kvm_page_track_write_tracking_enabled(kvm)))
return;

@@ -101,12 +100,11 @@ void kvm_slot_page_track_add_page(struct kvm *kvm,
if (kvm_mmu_slot_gfn_write_protect(kvm, slot, gfn, PG_LEVEL_4K))
kvm_flush_remote_tlbs(kvm);
}
-EXPORT_SYMBOL_GPL(kvm_slot_page_track_add_page);
+EXPORT_SYMBOL_GPL(kvm_write_track_add_gfn);

/*
* remove the guest page from the tracking pool which stops the interception
- * of corresponding access on that page. It is the opposed operation of
- * kvm_slot_page_track_add_page().
+ * of corresponding access on that page.
*
* It should be called under the protection both of mmu-lock and kvm->srcu
* or kvm->slots_lock.
@@ -115,8 +113,8 @@ EXPORT_SYMBOL_GPL(kvm_slot_page_track_add_page);
* @slot: the @gfn belongs to.
* @gfn: the guest page.
*/
-void kvm_slot_page_track_remove_page(struct kvm *kvm,
- struct kvm_memory_slot *slot, gfn_t gfn)
+void kvm_write_track_remove_gfn(struct kvm *kvm,
+ struct kvm_memory_slot *slot, gfn_t gfn)
{
if (WARN_ON(!kvm_page_track_write_tracking_enabled(kvm)))
return;
@@ -129,14 +127,13 @@ void kvm_slot_page_track_remove_page(struct kvm *kvm,
*/
kvm_mmu_gfn_allow_lpage(slot, gfn);
}
-EXPORT_SYMBOL_GPL(kvm_slot_page_track_remove_page);
+EXPORT_SYMBOL_GPL(kvm_write_track_remove_gfn);

/*
* check if the corresponding access on the specified guest page is tracked.
*/
-bool kvm_slot_page_track_is_active(struct kvm *kvm,
- const struct kvm_memory_slot *slot,
- gfn_t gfn)
+bool kvm_gfn_is_write_tracked(struct kvm *kvm,
+ const struct kvm_memory_slot *slot, gfn_t gfn)
{
int index;

diff --git a/arch/x86/kvm/mmu/page_track.h b/arch/x86/kvm/mmu/page_track.h
index ae2860bdf560..b27ccc588648 100644
--- a/arch/x86/kvm/mmu/page_track.h
+++ b/arch/x86/kvm/mmu/page_track.h
@@ -15,8 +15,8 @@ int kvm_page_track_create_memslot(struct kvm *kvm,
struct kvm_memory_slot *slot,
unsigned long npages);

-bool kvm_slot_page_track_is_active(struct kvm *kvm,
- const struct kvm_memory_slot *slot, gfn_t gfn);
+bool kvm_gfn_is_write_tracked(struct kvm *kvm,
+ const struct kvm_memory_slot *slot, gfn_t gfn);

#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING
int kvm_page_track_init(struct kvm *kvm);
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index cabad0ff722c..325afeb1246c 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1584,7 +1584,7 @@ int intel_gvt_page_track_add(struct intel_vgpu *info, u64 gfn)
}

write_lock(&kvm->mmu_lock);
- kvm_slot_page_track_add_page(kvm, slot, gfn);
+ kvm_write_track_add_gfn(kvm, slot, gfn);
write_unlock(&kvm->mmu_lock);

srcu_read_unlock(&kvm->srcu, idx);
@@ -1618,7 +1618,7 @@ int intel_gvt_page_track_remove(struct intel_vgpu *info, u64 gfn)
}

write_lock(&kvm->mmu_lock);
- kvm_slot_page_track_remove_page(kvm, slot, gfn);
+ kvm_write_track_remove_gfn(kvm, slot, gfn);
write_unlock(&kvm->mmu_lock);
srcu_read_unlock(&kvm->srcu, idx);

--
2.39.0.314.g84b9a713c41-goog