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authorSean Christopherson <seanjc@google.com>2021-12-06 20:54:10 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2021-12-08 10:24:19 +0100
commitce5f0215620c11a5829da7f30bebf3adeeef3345 (patch)
treefb9e6f195940eae5fb5a1e0b94786641e9019699 /virt
parentKVM: Resync only arch fields when slots_arch_lock gets reacquired (diff)
downloadlinux-ce5f0215620c11a5829da7f30bebf3adeeef3345.tar.xz
linux-ce5f0215620c11a5829da7f30bebf3adeeef3345.zip
KVM: Use "new" memslot's address space ID instead of dedicated param
Now that the address space ID is stored in every slot, including fake slots used for deletion, use the slot's as_id instead of passing in the redundant information as a param to kvm_set_memslot(). This will greatly simplify future memslot work by avoiding passing a large number of variables around purely to honor @as_id. Drop a comment in the DELETE path about new->as_id being provided purely for debug, as that's now a lie. No functional change intended. Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> Message-Id: <03189577be214ab8530a4b3a3ee3ed1c2f9e5815.1638817639.git.maciej.szmigiero@oracle.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c22
1 files changed, 9 insertions, 13 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 615d69bcde2c..a7a1c872fe6d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1551,7 +1551,7 @@ static void kvm_copy_memslots_arch(struct kvm_memslots *to,
static int kvm_set_memslot(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
- struct kvm_memory_slot *new, int as_id,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
struct kvm_memory_slot *slot, old;
@@ -1574,7 +1574,7 @@ static int kvm_set_memslot(struct kvm *kvm,
*/
mutex_lock(&kvm->slots_arch_lock);
- slots = kvm_dup_memslots(__kvm_memslots(kvm, as_id), change);
+ slots = kvm_dup_memslots(__kvm_memslots(kvm, new->as_id), change);
if (!slots) {
mutex_unlock(&kvm->slots_arch_lock);
return -ENOMEM;
@@ -1594,7 +1594,7 @@ static int kvm_set_memslot(struct kvm *kvm,
* dropped by update_memslots anyway. We'll also revert to the
* old memslots if preparing the new memory region fails.
*/
- slots = install_new_memslots(kvm, as_id, slots);
+ slots = install_new_memslots(kvm, new->as_id, slots);
/* From this point no new shadow pages pointing to a deleted,
* or moved, memslot will be created.
@@ -1616,7 +1616,7 @@ static int kvm_set_memslot(struct kvm *kvm,
* to retrieve memslots *after* acquiring slots_arch_lock, thus
* the active memslots are guaranteed to be fresh.
*/
- kvm_copy_memslots_arch(slots, __kvm_memslots(kvm, as_id));
+ kvm_copy_memslots_arch(slots, __kvm_memslots(kvm, new->as_id));
}
/*
@@ -1633,7 +1633,7 @@ static int kvm_set_memslot(struct kvm *kvm,
WARN_ON_ONCE(change != KVM_MR_CREATE);
memset(&old, 0, sizeof(old));
old.id = new->id;
- old.as_id = as_id;
+ old.as_id = new->as_id;
}
/* Copy the arch-specific data, again after (re)acquiring slots_arch_lock. */
@@ -1644,7 +1644,7 @@ static int kvm_set_memslot(struct kvm *kvm,
goto out_slots;
update_memslots(slots, new, change);
- slots = install_new_memslots(kvm, as_id, slots);
+ slots = install_new_memslots(kvm, new->as_id, slots);
/*
* Update the total number of memslot pages before calling the arch
@@ -1666,7 +1666,7 @@ static int kvm_set_memslot(struct kvm *kvm,
out_slots:
if (change == KVM_MR_DELETE || change == KVM_MR_MOVE)
- slots = install_new_memslots(kvm, as_id, slots);
+ slots = install_new_memslots(kvm, new->as_id, slots);
else
mutex_unlock(&kvm->slots_arch_lock);
kvfree(slots);
@@ -1738,13 +1738,9 @@ int __kvm_set_memory_region(struct kvm *kvm,
memset(&new, 0, sizeof(new));
new.id = id;
- /*
- * This is only for debugging purpose; it should never be
- * referenced for a removed memslot.
- */
new.as_id = as_id;
- return kvm_set_memslot(kvm, mem, &new, as_id, KVM_MR_DELETE);
+ return kvm_set_memslot(kvm, mem, &new, KVM_MR_DELETE);
}
new.as_id = as_id;
@@ -1807,7 +1803,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
bitmap_set(new.dirty_bitmap, 0, new.npages);
}
- r = kvm_set_memslot(kvm, mem, &new, as_id, change);
+ r = kvm_set_memslot(kvm, mem, &new, change);
if (r)
goto out_bitmap;