KVM: use __vcalloc for very large allocations

Allocations whose size is related to the memslot size can be arbitrarily
large.  Do not use kvzalloc/kvcalloc, as those are limited to "not crazy"
sizes that fit in 32 bits.

Cc: stable@vger.kernel.org
Fixes: 7661809d493b ("mm: don't allow oversized kvmalloc() calls")
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c
index e414ca4..be44140 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv_uvmem.c
+++ b/arch/powerpc/kvm/book3s_hv_uvmem.c
@@ -251,7 +251,7 @@ int kvmppc_uvmem_slot_init(struct kvm *kvm, const struct kvm_memory_slot *slot)
        p = kzalloc(sizeof(*p), GFP_KERNEL);
        if (!p)
                return -ENOMEM;
-       p->pfns = vzalloc(array_size(slot->npages, sizeof(*p->pfns)));
+       p->pfns = vcalloc(slot->npages, sizeof(*p->pfns));
        if (!p->pfns) {
                kfree(p);
                return -ENOMEM;

diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
index 68eb1fb..2e09d1b 100644 (file)
--- a/arch/x86/kvm/mmu/page_track.c
+++ b/arch/x86/kvm/mmu/page_track.c
@@ -47,8 +47,8 @@ int kvm_page_track_create_memslot(struct kvm *kvm,
                        continue;
 
                slot->arch.gfn_track[i] =
-                       kvcalloc(npages, sizeof(*slot->arch.gfn_track[i]),
-                                GFP_KERNEL_ACCOUNT);
+                       __vcalloc(npages, sizeof(*slot->arch.gfn_track[i]),
+                                 GFP_KERNEL_ACCOUNT);
                if (!slot->arch.gfn_track[i])
                        goto track_free;
        }
@@ -75,7 +75,8 @@ int kvm_page_track_write_tracking_alloc(struct kvm_memory_slot *slot)
        if (slot->arch.gfn_track[KVM_PAGE_TRACK_WRITE])
                return 0;
 
-       gfn_track = kvcalloc(slot->npages, sizeof(*gfn_track), GFP_KERNEL_ACCOUNT);
+       gfn_track = __vcalloc(slot->npages, sizeof(*gfn_track),
+                             GFP_KERNEL_ACCOUNT);
        if (gfn_track == NULL)
                return -ENOMEM;
 

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f79bf45..4fa4d82 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11838,7 +11838,7 @@ int memslot_rmap_alloc(struct kvm_memory_slot *slot, unsigned long npages)
                if (slot->arch.rmap[i])
                        continue;
 
-               slot->arch.rmap[i] = kvcalloc(lpages, sz, GFP_KERNEL_ACCOUNT);
+               slot->arch.rmap[i] = __vcalloc(lpages, sz, GFP_KERNEL_ACCOUNT);
                if (!slot->arch.rmap[i]) {
                        memslot_rmap_free(slot);
                        return -ENOMEM;
@@ -11875,7 +11875,7 @@ static int kvm_alloc_memslot_metadata(struct kvm *kvm,
 
                lpages = __kvm_mmu_slot_lpages(slot, npages, level);
 
-               linfo = kvcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT);
+               linfo = __vcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT);
                if (!linfo)
                        goto out_free;
 

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c941b97..69c318f 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1274,9 +1274,9 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
  */
 static int kvm_alloc_dirty_bitmap(struct kvm_memory_slot *memslot)
 {
-       unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
+       unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(memslot);
 
-       memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL_ACCOUNT);
+       memslot->dirty_bitmap = __vcalloc(2, dirty_bytes, GFP_KERNEL_ACCOUNT);
        if (!memslot->dirty_bitmap)
                return -ENOMEM;