[PATCH] KVM: MMU: Detect oom conditions and propagate error to userspace

[deliverable/linux.git] / drivers / kvm / paging_tmpl.h

diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index 4e6670ff18473ab0d3a044aeebbddc1cf9cd867f..32b385188454da6ccdfaa3c462682fb20f88a577 100644 (file)
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -339,7 +339,8 @@ static int FNAME(fix_write_pf)(struct kvm_vcpu *vcpu,
  *   - normal guest page fault due to the guest pte marked not present, not
  *     writable, or not executable
  *
- *  Returns: 1 if we need to emulate the instruction, 0 otherwise
+ *  Returns: 1 if we need to emulate the instruction, 0 otherwise, or
+ *           a negative value on error.
  */
 static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
                               u32 error_code)
@@ -351,10 +352,13 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
        u64 *shadow_pte;
        int fixed;
        int write_pt = 0;
+       int r;
 
        pgprintk("%s: addr %lx err %x\n", __FUNCTION__, addr, error_code);
 
-       mmu_topup_memory_caches(vcpu);
+       r = mmu_topup_memory_caches(vcpu);
+       if (r)
+               return r;
 
        /*
         * Look up the shadow pte for the faulting address.