linux-kernel - [RFC PATCH 12/19] kvm/book3s_64_vio: Convert account_locked_vm() to vm_account

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Message-Id: <3ef4b18a0ff174fcb2c81f8fafe900b43216d473.1674538665.git-series.apopple@nvidia.com>
Date:   Tue, 24 Jan 2023 16:42:41 +1100
From:   Alistair Popple <apopple@...dia.com>
To:     linux-mm@...ck.org, cgroups@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jgg@...dia.com, jhubbard@...dia.com,
        tjmercier@...gle.com, hannes@...xchg.org, surenb@...gle.com,
        mkoutny@...e.com, daniel@...ll.ch,
        Alistair Popple <apopple@...dia.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        linuxppc-dev@...ts.ozlabs.org, kvm@...r.kernel.org
Subject: [RFC PATCH 12/19] kvm/book3s_64_vio: Convert account_locked_vm() to vm_account_pinned()

book3s_64_vio currently accounts for pinned pages with
account_locked_vm() which charges the pages to mm->locked_vm. To make
this consistent with other drivers switch to using
vm_account_pinned().

Signed-off-by: Alistair Popple <apopple@...dia.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Alexey Kardashevskiy <aik@...abs.ru>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
Cc: kvm@...r.kernel.org
---
 arch/powerpc/kvm/book3s_64_vio.c | 10 +++++-----
 include/linux/kvm_host.h         |  1 +
 virt/kvm/kvm_main.c              |  3 +++
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c
index 95e738e..ecd1deb 100644
--- a/arch/powerpc/kvm/book3s_64_vio.c
+++ b/arch/powerpc/kvm/book3s_64_vio.c
@@ -273,8 +273,8 @@ static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
 		}
 	}
 
-	account_locked_vm(kvm->mm,
-		kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
+	vm_unaccount_pinned(&kvm->vm_account,
+		kvmppc_stt_pages(kvmppc_tce_pages(stt->size)));
 
 	kvm_put_kvm(stt->kvm);
 
@@ -301,8 +301,8 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
 		(args->offset + args->size > (ULLONG_MAX >> args->page_shift)))
 		return -EINVAL;
 
-	npages = kvmppc_tce_pages(args->size);
-	ret = account_locked_vm(mm, kvmppc_stt_pages(npages), true);
+	npages = kvmppc_tce_pages(size);
+	ret = vm_account_pinned(&kvm->vm_account, kvmppc_stt_pages(npages));
 	if (ret)
 		return ret;
 
@@ -347,7 +347,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
 
 	kfree(stt);
  fail_acct:
-	account_locked_vm(mm, kvmppc_stt_pages(npages), false);
+	vm_unaccount_pinned(&kvm->vm_account, kvmppc_stt_pages(npages));
 	return ret;
 }
 
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 4f26b24..25ed390 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -717,6 +717,7 @@ struct kvm {
 	 */
 	struct mutex slots_arch_lock;
 	struct mm_struct *mm; /* userspace tied to this vm */
+	struct vm_account vm_account;
 	unsigned long nr_memslot_pages;
 	/* The two memslot sets - active and inactive (per address space) */
 	struct kvm_memslots __memslots[KVM_ADDRESS_SPACE_NUM][2];
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 9c60384..770d037 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1142,6 +1142,7 @@ static struct kvm *kvm_create_vm(unsigned long type, const char *fdname)
 	KVM_MMU_LOCK_INIT(kvm);
 	mmgrab(current->mm);
 	kvm->mm = current->mm;
+	vm_account_init_current(&kvm->vm_account);
 	kvm_eventfd_init(kvm);
 	mutex_init(&kvm->lock);
 	mutex_init(&kvm->irq_lock);
@@ -1258,6 +1259,7 @@ static struct kvm *kvm_create_vm(unsigned long type, const char *fdname)
 out_err_no_srcu:
 	kvm_arch_free_vm(kvm);
 	mmdrop(current->mm);
+	vm_account_release(&kvm->vm_account);
 	module_put(kvm_chardev_ops.owner);
 	return ERR_PTR(r);
 }
@@ -1327,6 +1329,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
 	preempt_notifier_dec();
 	hardware_disable_all();
 	mmdrop(mm);
+	vm_account_release(&kvm->vm_account);
 	module_put(kvm_chardev_ops.owner);
 }
 
-- 
git-series 0.9.1