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| author | Nir Weiner <nir.weiner@oracle.com> | 2019-01-27 12:17:14 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-02-20 22:48:50 +0100 |
| commit | 7fa08e71b4a0591a518814fa78b32e124f90d587 (patch) | |
| tree | f8b66306b476c5b6e833bceef8a0434bc9116652 /arch | |
| parent | 8ab3c471eef20925bf64c6d4fa46e88cdb4e86d5 (diff) | |
| download | linux-7fa08e71b4a0591a518814fa78b32e124f90d587.tar.bz2 | |
KVM: grow_halt_poll_ns() should never shrink vCPU halt_poll_ns
grow_halt_poll_ns() have a strange behavior in case
(halt_poll_ns_grow == 0) && (vcpu->halt_poll_ns != 0).
In this case, vcpu->halt_pol_ns will be set to zero.
That results in shrinking instead of growing.
Fix issue by changing grow_halt_poll_ns() to not modify
vcpu->halt_poll_ns in case halt_poll_ns_grow is zero
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Nir Weiner <nir.weiner@oracle.com>
Suggested-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 5a066fc299e1..e316a2ddb70b 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -3631,8 +3631,11 @@ static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc, static void grow_halt_poll_ns(struct kvmppc_vcore *vc) { + if (!halt_poll_ns_grow) + return; + /* 10us base */ - if (vc->halt_poll_ns == 0 && halt_poll_ns_grow) + if (vc->halt_poll_ns == 0) vc->halt_poll_ns = 10000; else vc->halt_poll_ns *= halt_poll_ns_grow; |