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From 779370f8d1cf47e46b39b210a43d24804e551071 Mon Sep 17 00:00:00 2001
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From: Laurent Vivier <lvivier@redhat.com>
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Date: Mon, 12 Feb 2018 12:04:49 +0100
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Subject: [PATCH 04/15] spapr: set vsmt to MAX(8, smp_threads)
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RH-Author: Laurent Vivier <lvivier@redhat.com>
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Message-id: <20180212120449.20810-1-lvivier@redhat.com>
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Patchwork-id: 78978
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O-Subject: [RHV7.5 qemu-kvm-rhev PATCH] spapr: set vsmt to MAX(8, smp_threads)
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Bugzilla: 1542421
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RH-Acked-by: David Gibson <dgibson@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Serhii Popovych <spopovyc@redhat.com>
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We ignore silently the value of smp_threads when we set
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the default VSMT value, and if smp_threads is greater than VSMT
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kernel is going into trouble later.
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Fixes: 8904e5a750
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("spapr: Adjust default VSMT value for better migration compatibility")
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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Reviewed-by: Greg Kurz <groug@kaod.org>
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Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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(cherry picked from commit 4ad64cbd0c3f9df15be5f7d1c920285551e802ca)
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/ppc/spapr.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
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index 6c4c088..2b991d8 100644
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--- a/hw/ppc/spapr.c
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+++ b/hw/ppc/spapr.c
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@@ -2261,7 +2261,7 @@ static void spapr_set_vsmt_mode(sPAPRMachineState *spapr, Error **errp)
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* the value that we'd get with KVM on POWER8, the
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* overwhelmingly common case in production systems.
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*/
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- spapr->vsmt = 8;
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+ spapr->vsmt = MAX(8, smp_threads);
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}
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/* KVM: If necessary, set the SMT mode: */
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--
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1.8.3.1
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