Nested rmap entries are used to store a reverse mapping from a L1 guest
page in a kvm memslot to a nested guest pte.
Implement a function to remove all nest rmap entries of a given lpid
from all of the memslots for a given guest.
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@xxxxxxxxx>
---
arch/powerpc/kvm/book3s_hv_nested.c | 47 +++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
index c76e499437ee..58a5de2aa2af 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c
@@ -819,6 +819,53 @@ void kvmhv_insert_nest_rmap(unsigned long *rmapp, struct rmap_nested **n_rmap)
*n_rmap = NULL;
}
+/* called with kvm->mmu_lock held */
+static void kvmhv_remove_nested_rmap_lpid(unsigned long *rmapp, int l1_lpid)
+{
+ struct llist_node **next = &(((struct llist_head *) rmapp)->first);
+ u64 match = lpid_to_n_rmap(l1_lpid);
+
+ while (*next) {
+ struct llist_node *entry = (*next);
+ struct rmap_nested *n_rmap = llist_entry(entry, typeof(*n_rmap),
+ list);
+
+ if (kvmhv_n_rmap_is_equal(match, n_rmap->rmap,
+ RMAP_NESTED_LPID_MASK)) {
+ *next = entry->next;
+ kfree(n_rmap);
+ } else {
+ next = &(entry->next);
+ }
+ }
+}
+
+/*
+ * caller must hold gp->tlb_lock
+ * For a given nested lpid, remove all of the rmap entries which match that
+ * nest lpid. Note that no invalidation/tlbie is done for the entries, it is
+ * assumed that the caller will perform an lpid wide invalidation after calling
+ * this function.
+ */
+static void kvmhv_remove_all_nested_rmap_lpid(struct kvm *kvm, int l1_lpid)
+{
+ struct kvm_memory_slot *memslot;
+
+ kvm_for_each_memslot(memslot, kvm_memslots(kvm)) {
+ unsigned long page;
+
+ for (page = 0; page < memslot->npages; page++) {
+ unsigned long *rmapp;
+
+ spin_lock(&kvm->mmu_lock);
+ rmapp = &memslot->arch.rmap[page];
+ if (*rmapp) /* Are there any rmap entries? */
+ kvmhv_remove_nested_rmap_lpid(rmapp, l1_lpid);
+ spin_unlock(&kvm->mmu_lock);
+ }
+ }
+}
+
/*
* called with kvm->mmu_lock held
* Given a single rmap entry, update the rc bits in the corresponding shadow
--
2.13.6
