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[PULL,11/11] target/s390x/cpu topology: Fix ordering and creation of TLEs

Message ID 20231107183228.276424-12-thuth@redhat.com (mailing list archive)
State New, archived
Headers show
Series [PULL,01/11] MAINTAINERS: Add the virtio-gpu documentation to the corresponding section | expand

Commit Message

Thomas Huth Nov. 7, 2023, 6:32 p.m. UTC 
From: Nina Schoetterl-Glausch <nsg@linux.ibm.com>

In case of horizontal polarization entitlement has no effect on
ordering.
Moreover, since the comparison is used to insert CPUs at the correct
position in the TLE list, this affects the creation of TLEs and now
correctly collapses horizontally polarized CPUs into one TLE.

Fixes: f4f54b582f ("target/s390x/cpu topology: handle STSI(15) and build the SYSIB")
Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Message-ID: <20231027163637.3060537-1-nsg@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 target/s390x/kvm/stsi-topology.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
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Patch

diff --git a/target/s390x/kvm/stsi-topology.c b/target/s390x/kvm/stsi-topology.c
index efd2aa71f1..c8d6389cd8 100644
--- a/target/s390x/kvm/stsi-topology.c
+++ b/target/s390x/kvm/stsi-topology.c
@@ -210,6 +210,9 @@  static S390TopologyId s390_topology_from_cpu(S390CPU *cpu)
 static int s390_topology_id_cmp(const S390TopologyId *l,
                                 const S390TopologyId *r)
 {
+    int l_polarization = l->vertical ? l->entitlement : 0;
+    int r_polarization = r->vertical ? r->entitlement : 0;
+
     /*
      * lexical order, compare less significant values only if more significant
      * ones are equal
@@ -219,9 +222,8 @@  static int s390_topology_id_cmp(const S390TopologyId *l,
            l->book - r->book ?:
            l->socket - r->socket ?:
            l->type - r->type ?:
-           /* logic is inverted for the next three */
-           r->vertical - l->vertical ?:
-           r->entitlement - l->entitlement ?:
+           /* logic is inverted for the next two */
+           r_polarization - l_polarization ?:
            r->dedicated - l->dedicated ?:
            l->origin - r->origin;
 }