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[008/113] spapr: set vsmt to MAX(8, smp_threads)

Message ID 20180619014319.28272-9-mdroth@linux.vnet.ibm.com
State New
Headers show
Series [001/113] block/ssh: fix possible segmentation fault when .desc is not null-terminated | expand

Commit Message

Michael Roth June 19, 2018, 1:41 a.m. UTC 
From: Laurent Vivier <lvivier@redhat.com>

We ignore silently the value of smp_threads when we set
the default VSMT value, and if smp_threads is greater than VSMT
kernel is going into trouble later.

Fixes: 8904e5a750
("spapr: Adjust default VSMT value for better migration compatibility")

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
(cherry picked from commit 4ad64cbd0c3f9df15be5f7d1c920285551e802ca)
Signed-off-by: Greg Kurz <groug@kaod.org>
---
 hw/ppc/spapr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 0c6547faef..6f78c1cf7a 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2289,7 +2289,7 @@  static void spapr_set_vsmt_mode(sPAPRMachineState *spapr, Error **errp)
          * the value that we'd get with KVM on POWER8, the
          * overwhelmingly common case in production systems.
          */
-        spapr->vsmt = 8;
+        spapr->vsmt = MAX(8, smp_threads);
     }
 
     /* KVM: If necessary, set the SMT mode: */