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authorRik van Riel <riel@redhat.com>2012-06-19 16:51:04 -0400
committerMarcelo Tosatti <mtosatti@redhat.com>2012-07-06 14:11:18 -0300
commit5cfc2aabcb282f4554e7086c9893b386ad6ba9d4 (patch)
tree81b9989c069f54e42a748c8af6a2989bdbe6a8b9 /virt
parent21b26c08535c992802402c7ba2d789ca9e1a5707 (diff)
downloadlinux-5cfc2aabcb282f4554e7086c9893b386ad6ba9d4.tar.gz
KVM: handle last_boosted_vcpu = 0 case
If last_boosted_vcpu == 0, then we fall through all test cases and may end up with all VCPUs pouncing on vcpu 0. With a large enough guest, this can result in enormous runqueue lock contention, which can prevent vcpu0 from running, leading to a livelock. Changing < to <= makes sure we properly handle that case. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 636bd08bb39..b3ce91c623e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1598,7 +1598,7 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me)
*/
for (pass = 0; pass < 2 && !yielded; pass++) {
kvm_for_each_vcpu(i, vcpu, kvm) {
- if (!pass && i < last_boosted_vcpu) {
+ if (!pass && i <= last_boosted_vcpu) {
i = last_boosted_vcpu;
continue;
} else if (pass && i > last_boosted_vcpu)