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KVM: do not bias the generation number in kvm_current_mmio_generation

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The next patch will give a meaning (a la seqcount) to the low bit of the
generation number.  Ensure that it matches between kvm->memslots->generation
and kvm_current_mmio_generation().

Cc: [email protected]
Reviewed-by: David Matlack <[email protected]>
Reviewed-by: Xiao Guangrong <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Paolo Bonzini 2014-08-20 14:29:21 +02:00
commit 00f034a12f
2 changed files with 8 additions and 6 deletions
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7
virt/kvm/kvm_main.c
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@ -477,6 +477,13 @@ static struct kvm *kvm_create_vm(unsigned long type)
kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
if (!kvm->memslots)
goto out_err_no_srcu;
/*
* Init kvm generation close to the maximum to easily test the
* code of handling generation number wrap-around.
*/
kvm->memslots->generation = -150;
kvm_init_memslots_id(kvm);
if (init_srcu_struct(&kvm->srcu))
goto out_err_no_srcu;