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From bda9cc7585816a5233beba2661510ecc4d69c4e2 Mon Sep 17 00:00:00 2001
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Message-Id: <bda9cc7585816a5233beba2661510ecc4d69c4e2@dist-git>
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From: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
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Date: Wed, 7 Feb 2018 14:16:02 +0100
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Subject: [PATCH] qemu: Limit refresh of CPU halted state to s390
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Refreshing the halted state can cause VM performance issues. Since
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s390 is currently the only architecture with a known interest in
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the halted state, we're avoiding to call QEMU on other platforms.
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Signed-off-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
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(cherry picked from commit 818a29e0c7d6840e87e9ca6019b9f0bc1983566e)
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https://bugzilla.redhat.com/show_bug.cgi?id=1534585
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---
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src/qemu/qemu_domain.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
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index e87c7d030c..0f7f3b7f50 100644
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--- a/src/qemu/qemu_domain.c
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+++ b/src/qemu/qemu_domain.c
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@@ -7989,6 +7989,11 @@ qemuDomainRefreshVcpuHalted(virQEMUDriverPtr driver,
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if (vm->def->virtType == VIR_DOMAIN_VIRT_QEMU)
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return 0;
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+ /* The halted state is interresting only on s390(x). On other platforms
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+ * the data would be stale at the time when it would be used. */
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+ if (!ARCH_IS_S390(vm->def->os.arch))
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+ return 0;
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+
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if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
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return -1;
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--
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2.16.1
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