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KVM: Add build-time error check on kvm_run size

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It's already going to reach 2400 Bytes (which is over half of page
size on 4K page archs), so maybe it's good to have this build-time
check in case it overflows when adding new fields.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2020-01-09 09:57:12 -05:00 committed by Paolo Bonzini
parent ef82eddc0e
commit fcd97ad58f
1 changed files with 1 additions and 0 deletions
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virt/kvm/kvm_main.c
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@ -2710,6 +2710,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
goto vcpu_decrement; goto vcpu_decrement;
} }
BUILD_BUG_ON(sizeof(struct kvm_run) > PAGE_SIZE);
page = alloc_page(GFP_KERNEL | __GFP_ZERO); page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page) { if (!page) {
r = -ENOMEM; r = -ENOMEM;