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authorMaciej S. Szmigiero <maciej.szmigiero@oracle.com>2021-12-06 22:54:25 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2021-12-08 12:24:30 +0300
commitc928bfc2632fa3dd6a3bd4504ac6d8e42302287a (patch)
tree79d34395cf30656db4734e314a56e1aeeefcaf42 /include
parentf5756029eef501bcd39ecd844968e4fb3055c1bd (diff)
downloadlinux-c928bfc2632fa3dd6a3bd4504ac6d8e42302287a.tar.xz
KVM: Integrate gfn_to_memslot_approx() into search_memslots()
s390 arch has gfn_to_memslot_approx() which is almost identical to search_memslots(), differing only in that in case the gfn falls in a hole one of the memslots bordering the hole is returned. Add this lookup mode as an option to search_memslots() so we don't have two almost identical functions for looking up a memslot by its gfn. Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> [sean: tweaked helper names to keep gfn_to_memslot_approx() in s390] Reviewed-by: Sean Christopherson <seanjc@google.com> Message-Id: <171cd89b52c718dbe180ecd909b4437a64a7e2ec.1638817640.git.maciej.szmigiero@oracle.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kvm_host.h35
1 files changed, 27 insertions, 8 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index da0d4f21a150..2f80ce84fbcf 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1233,10 +1233,14 @@ try_get_memslot(struct kvm_memslots *slots, int slot_index, gfn_t gfn)
* Returns a pointer to the memslot that contains gfn and records the index of
* the slot in index. Otherwise returns NULL.
*
+ * With "approx" set returns the memslot also when the address falls
+ * in a hole. In that case one of the memslots bordering the hole is
+ * returned.
+ *
* IMPORTANT: Slots are sorted from highest GFN to lowest GFN!
*/
static inline struct kvm_memory_slot *
-search_memslots(struct kvm_memslots *slots, gfn_t gfn, int *index)
+search_memslots(struct kvm_memslots *slots, gfn_t gfn, int *index, bool approx)
{
int start = 0, end = slots->used_slots;
struct kvm_memory_slot *memslots = slots->memslots;
@@ -1254,22 +1258,26 @@ search_memslots(struct kvm_memslots *slots, gfn_t gfn, int *index)
start = slot + 1;
}
+ if (approx && start >= slots->used_slots) {
+ *index = slots->used_slots - 1;
+ return &memslots[slots->used_slots - 1];
+ }
+
slot = try_get_memslot(slots, start, gfn);
if (slot) {
*index = start;
return slot;
}
+ if (approx) {
+ *index = start;
+ return &memslots[start];
+ }
return NULL;
}
-/*
- * __gfn_to_memslot() and its descendants are here because it is called from
- * non-modular code in arch/powerpc/kvm/book3s_64_vio{,_hv}.c. gfn_to_memslot()
- * itself isn't here as an inline because that would bloat other code too much.
- */
static inline struct kvm_memory_slot *
-__gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
+____gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn, bool approx)
{
struct kvm_memory_slot *slot;
int slot_index = atomic_read(&slots->last_used_slot);
@@ -1278,7 +1286,7 @@ __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
if (slot)
return slot;
- slot = search_memslots(slots, gfn, &slot_index);
+ slot = search_memslots(slots, gfn, &slot_index, approx);
if (slot) {
atomic_set(&slots->last_used_slot, slot_index);
return slot;
@@ -1287,6 +1295,17 @@ __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
return NULL;
}
+/*
+ * __gfn_to_memslot() and its descendants are here to allow arch code to inline
+ * the lookups in hot paths. gfn_to_memslot() itself isn't here as an inline
+ * because that would bloat other code too much.
+ */
+static inline struct kvm_memory_slot *
+__gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
+{
+ return ____gfn_to_memslot(slots, gfn, false);
+}
+
static inline unsigned long
__gfn_to_hva_memslot(const struct kvm_memory_slot *slot, gfn_t gfn)
{