FAILED: patch "[PATCH] KVM: use __vcalloc for very large allocations" failed to apply to 5.17-stable tree

PATCH [email protected] 1 participant 1 message Apr 2, 2022

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Stable branch x86 KVM PowerPC +2 more subsystems

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2022-04-02 13:07 UTC #0 lore raw

The patch below does not apply to the 5.17-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 37b2a6510a48ca361ced679f92682b7b7d7d0330 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <[email protected]>
Date: Tue, 8 Mar 2022 04:49:37 -0500
Subject: [PATCH] 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 [email protected]

Fixes 7661809d493b ("mm: don't allow oversized kvmalloc() calls")

Reviewed-by David Hildenbrand <[email protected]>

Signed-off-by Paolo Bonzini <[email protected]>

arch/powerpc/kvm/book3s_hv_uvmem.c +1 -1

index e414ca44839f..be441403925b 100644
@@ -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;

arch/x86/kvm/mmu/page_track.c +4 -3

index 68eb1fb548b6..2e09d1b6249f 100644
@@ -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;

arch/x86/kvm/x86.c +2 -2

index f79bf4552082..4fa4d8269e5b 100644
@@ -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;

virt/kvm/kvm_main.c +2 -2

index c941b97fa133..69c318fdff61 100644
@@ -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;