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Message-Id: <03189577be214ab8530a4b3a3ee3ed1c2f9e5815.1638817639.git.maciej.szmigiero@oracle.com>
Date: Mon, 6 Dec 2021 20:54:10 +0100
From: "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To: Paolo Bonzini <pbonzini@...hat.com>,
Sean Christopherson <seanjc@...gle.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
Igor Mammedov <imammedo@...hat.com>,
Marc Zyngier <maz@...nel.org>,
James Morse <james.morse@....com>,
Julien Thierry <julien.thierry.kdev@...il.com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Huacai Chen <chenhuacai@...nel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
Paul Mackerras <paulus@...abs.org>,
Christian Borntraeger <borntraeger@...ibm.com>,
Janosch Frank <frankja@...ux.ibm.com>,
David Hildenbrand <david@...hat.com>,
Cornelia Huck <cohuck@...hat.com>,
Claudio Imbrenda <imbrenda@...ux.ibm.com>,
Anup Patel <anup.patel@....com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Alexandru Elisei <alexandru.elisei@....com>,
Ben Gardon <bgardon@...gle.com>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v7 04/29] KVM: Use "new" memslot's address space ID instead of dedicated param
From: Sean Christopherson <seanjc@...gle.com>
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@...gle.com>
Reviewed-by: Maciej S. Szmigiero <maciej.szmigiero@...cle.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@...cle.com>
---
virt/kvm/kvm_main.c | 22 +++++++++-------------
1 file changed, 9 insertions(+), 13 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 95616392ff91..683a5ef6f71e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1553,7 +1553,7 @@ 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;
@@ -1576,7 +1576,7 @@ 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;
@@ -1596,7 +1596,7 @@ 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.
@@ -1618,7 +1618,7 @@ 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));
}
/*
@@ -1635,7 +1635,7 @@ 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. */
@@ -1646,7 +1646,7 @@ 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
@@ -1668,7 +1668,7 @@ 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);
@@ -1740,13 +1740,9 @@ 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;
@@ -1809,7 +1805,7 @@ 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;
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