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KVM common MMU changes for 6.9:

Browse Source 
- Harden KVM against underflowing the active mmu_notifier invalidation
     count, so that "bad" invalidations (usually due to bugs elsehwere in the
     kernel) are detected earlier and are less likely to hang the kernel.
 
   - Fix a benign bug in __kvm_mmu_topup_memory_cache() where the object size
     and number of objects parameters to kvmalloc_array() were swapped.
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Merge tag 'kvm-x86-generic-6.9' of https://github.com/kvm-x86/linux into HEAD

KVM common MMU changes for 6.9:

  - Harden KVM against underflowing the active mmu_notifier invalidation
    count, so that "bad" invalidations (usually due to bugs elsehwere in the
    kernel) are detected earlier and are less likely to hang the kernel.

  - Fix a benign bug in __kvm_mmu_topup_memory_cache() where the object size
    and number of objects parameters to kvmalloc_array() were swapped.
This commit is contained in:
Paolo Bonzini 2024-03-11 10:23:03 -04:00
commit 507e72f899
1 changed files with 4 additions and 2 deletions
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6
virt/kvm/kvm_main.c
View File

@ -421,7 +421,7 @@ int __kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int capacity,
if (WARN_ON_ONCE(!capacity))
return -EIO;
mc->objects = kvmalloc_array(sizeof(void *), capacity, gfp);
mc->objects = kvmalloc_array(capacity, sizeof(void *), gfp);
if (!mc->objects)
return -ENOMEM;
@ -890,7 +890,9 @@ static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
/* Pairs with the increment in range_start(). */
spin_lock(&kvm->mn_invalidate_lock);
wake = (--kvm->mn_active_invalidate_count == 0);
if (!WARN_ON_ONCE(!kvm->mn_active_invalidate_count))
--kvm->mn_active_invalidate_count;
wake = !kvm->mn_active_invalidate_count;
spin_unlock(&kvm->mn_invalidate_lock);
/*