[RFC PATCH v6 21/92] kvm: page track: add track_create_slot() callback
STALE2556d
From: Adalbert Lazăr <hidden>
Date: 2019-08-09 16:01:57
Also in:
kvm, linux-mm
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Revision v6 of 3 in this series.
Revisions (3)
- v6 current
- v8 [diff vs current]
- v11 [diff vs current]
From: Mihai Donțu <redacted> This is used to add page access notifications as soon as a slot appears. CC: Xiao Guangrong <redacted> Signed-off-by: Mihai Donțu <redacted> Signed-off-by: Adalbert Lazăr <redacted> --- arch/x86/include/asm/kvm_page_track.h | 5 ++++- arch/x86/kvm/page_track.c | 18 ++++++++++++++++-- arch/x86/kvm/x86.c | 2 +- 3 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h
index 172f9749dbb2..18a94d180485 100644
--- a/arch/x86/include/asm/kvm_page_track.h
+++ b/arch/x86/include/asm/kvm_page_track.h@@ -34,6 +34,9 @@ struct kvm_page_track_notifier_node { */ void (*track_write)(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, int bytes, struct kvm_page_track_notifier_node *node); + void (*track_create_slot)(struct kvm *kvm, struct kvm_memory_slot *slot, + unsigned long npages, + struct kvm_page_track_notifier_node *node); /* * It is called when memory slot is being moved or removed * users can drop write-protection for the pages in that memory slot
@@ -51,7 +54,7 @@ void kvm_page_track_cleanup(struct kvm *kvm); void kvm_page_track_free_memslot(struct kvm_memory_slot *free, struct kvm_memory_slot *dont); -int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, +int kvm_page_track_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, unsigned long npages); void kvm_slot_page_track_add_page(struct kvm *kvm,
diff --git a/arch/x86/kvm/page_track.c b/arch/x86/kvm/page_track.c
index 3052a59a3065..db5b906876bb 100644
--- a/arch/x86/kvm/page_track.c
+++ b/arch/x86/kvm/page_track.c@@ -34,10 +34,13 @@ void kvm_page_track_free_memslot(struct kvm_memory_slot *free, } } -int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, +int kvm_page_track_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, unsigned long npages) { - int i; + struct kvm_page_track_notifier_head *head; + struct kvm_page_track_notifier_node *n; + int idx; + int i; for (i = 0; i < KVM_PAGE_TRACK_MAX; i++) { slot->arch.gfn_track[i] =
@@ -47,6 +50,17 @@ int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, goto track_free; } + head = &kvm->arch.track_notifier_head; + + if (hlist_empty(&head->track_notifier_list)) + return 0; + + idx = srcu_read_lock(&head->track_srcu); + hlist_for_each_entry_rcu(n, &head->track_notifier_list, node) + if (n->track_create_slot) + n->track_create_slot(kvm, slot, npages, n); + srcu_read_unlock(&head->track_srcu, idx); + return 0; track_free:
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 30cf0d162aa8..f66db9473ea3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c@@ -9350,7 +9350,7 @@ int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, } } - if (kvm_page_track_create_memslot(slot, npages)) + if (kvm_page_track_create_memslot(kvm, slot, npages)) goto out_free; return 0;
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