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authorPeter Xu <peterx@redhat.com>2020-01-09 09:57:12 -0500
committerPaolo Bonzini <pbonzini@redhat.com>2020-01-27 19:59:52 +0100
commitfcd97ad58f76efcd58808941e4dd2bc6c544b9de (patch)
tree5dd4881c265a5b2dcc72ce056de2c359cd6822e3 /virt
parentef82eddc0e3179b4529a67ed102fe4f7efba2e65 (diff)
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KVM: Add build-time error check on kvm_run size
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>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 929d7fccf7cd..4f3ac8b753b6 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2710,6 +2710,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
goto vcpu_decrement;
}
+ BUILD_BUG_ON(sizeof(struct kvm_run) > PAGE_SIZE);
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page) {
r = -ENOMEM;