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KVM: Add PV MSR to enable asynchronous page faults delivery.

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Guest enables async PF vcpu functionality using this MSR.

Reviewed-by: Rik van Riel <[email protected]>
Signed-off-by: Gleb Natapov <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
This commit is contained in:
Gleb Natapov 2010-10-14 11:22:50 +02:00 • committed by Avi Kivity
commit 344d9588a9
8 changed files with 101 additions and 3 deletions
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20
virt/kvm/async_pf.c
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@ -190,3 +190,23 @@ retry_sync:
kmem_cache_free(async_pf_cache, work);
return 0;
}
int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu)
{
struct kvm_async_pf *work;
if (!list_empty(&vcpu->async_pf.done))
return 0;
work = kmem_cache_zalloc(async_pf_cache, GFP_ATOMIC);
if (!work)
return -ENOMEM;
work->page = bad_page;
get_page(bad_page);
INIT_LIST_HEAD(&work->queue); /* for list_del to work */
list_add_tail(&work->link, &vcpu->async_pf.done);
vcpu->async_pf.queued++;
return 0;
}