[PATCH RFC 03/15] KVM: Add build-time error check on kvm_run size

Peter Xu
2019-11-29T21:36:24Z

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>
---
virt/kvm/kvm_main.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8f8940cc4b84..681452d288cd 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -352,6 +352,8 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
}
vcpu->run = page_address(page);

+ BUILD_BUG_ON(sizeof(struct kvm_run) > PAGE_SIZE);
+
kvm_vcpu_set_in_spin_loop(vcpu, false);
kvm_vcpu_set_dy_eligible(vcpu, false);
vcpu->preempted = false;
--
2.21.0