[libvirt] [PATCH v2] qemu: fix vcpupin fail as no vcpu tid set

[wang.yi59 at zte.com.cn]

> more descriptive as:
> qemu: fix vcpu pinning when not all vcpus are enabled

Thanks.

>
> On Tue, Feb 26, 2019 at 10:01:28AM +0800, Yi Wang wrote:
> >vcpupin will fail when maxvcpus is larger than current
> >vcpu:
> >
> >virsh vcpupin win7 --vcpu 0 --cpulist 5-6
> >error: Requested operation is not valid: cpu affinity is not supported
> >
> >win7 xml in the command above is like below:
> >...
> ><vcpu current="3" placement="static">8</vcpu>
> >...
> >
> >The reason is vcpu[3] and vcpu[4] have zero tids and should not been
> >compared as valid situation in qemuDomainRefreshVcpuInfo().
> >
> >This issue is introduced by commit 34f7743, which fix recording of vCPU
> >pids for MTTCG.
> >
> >Signed-off-by: Yi Wang <wang.yi59 at zte.com.cn>
> >---
> >v2: stop considering zero TIDs as duplicate. Thanks to Jano.
> >---
> > src/qemu/qemu_domain.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> >diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> >index ac01e86..c70d3f3 100644
> >--- a/src/qemu/qemu_domain.c
> >+++ b/src/qemu/qemu_domain.c
> >@@ -10708,7 +10708,7 @@ qemuDomainRefreshVcpuInfo(virQEMUDriverPtr driver,
> >         }
> >
> >         for (j = 0; j < i; j++) {
> >-            if (info[i].tid == info[j].tid) {
> >+            if (0 != info[i].tid && info[i].tid == info[j].tid) {
>
> The prevalent style is with the '0' on the right side. I'll fix that
> when pushing.

Thank you, Jano.

>
> >                 VIR_DEBUG("vCPU[%zu] PID %llu duplicates vCPU[%zu]",
> >                           i, (unsigned long long)info[i].tid, j);
> >                 validTIDs = false;
>
> Reviewed-by: Ján Tomko <jtomko at redhat.com>
>
> Jano

---
Best wishes
Yi Wang