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author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2010-11-01 17:01:28 +0800 |
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committer | Avi Kivity <avi@redhat.com> | 2011-01-12 11:29:00 +0200 |
commit | e6d53e3b0db7ae3641f01a2b2af1470fda86d10c (patch) | |
tree | 95b94e3caa16222379ef708ed6a073ddbc95a0a8 /virt | |
parent | c7d28c24042f7969adc29147d6c0a190192a6808 (diff) | |
download | op-kernel-dev-e6d53e3b0db7ae3641f01a2b2af1470fda86d10c.zip op-kernel-dev-e6d53e3b0db7ae3641f01a2b2af1470fda86d10c.tar.gz |
KVM: avoid unnecessary wait for a async pf
In current code, it checks async pf completion out of the wait context,
like this:
if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
!vcpu->arch.apf.halted)
r = vcpu_enter_guest(vcpu);
else {
......
kvm_vcpu_block(vcpu)
^- waiting until 'async_pf.done' is not empty
}
kvm_check_async_pf_completion(vcpu)
^- delete list from async_pf.done
So, if we check aysnc pf completion first, it can be blocked at
kvm_vcpu_block
Fixed by mark the vcpu is unhalted in kvm_check_async_pf_completion()
path
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Acked-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions