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From 7d495864b89cd3a65aac555f42de044c592ad21b Mon Sep 17 00:00:00 2001
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Message-Id: <7d495864b89cd3a65aac555f42de044c592ad21b@dist-git>
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From: Jiri Denemark <jdenemar@redhat.com>
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Date: Tue, 4 Jun 2019 13:04:32 +0200
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Subject: [PATCH] cpu_x86: Probe TSC frequency and scaling support
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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When the host CPU supports invariant TSC the host CPU definition created
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by virCPUx86GetHost will contain (unless probing fails for some reason)
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addition TSC related data.
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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(cherry picked from commit ceb04d15e671b4fea1d674ee43c91410da9fe57d)
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https://bugzilla.redhat.com/show_bug.cgi?id=1641702
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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Message-Id: <a738a180a4b3771d57ed46449aa305f4e914a98d.1559646067.git.jdenemar@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/cpu/cpu_x86.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
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index bd10862f57..e06e452aee 100644
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--- a/src/cpu/cpu_x86.c
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+++ b/src/cpu/cpu_x86.c
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@@ -2587,6 +2587,15 @@ virCPUx86GetHost(virCPUDefPtr cpu,
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ret = x86DecodeCPUData(cpu, cpuData, models);
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cpu->microcodeVersion = virHostCPUGetMicrocodeVersion();
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+ /* Probing for TSC frequency makes sense only if the CPU supports
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+ * invariant TSC (Linux calls this constant_tsc in /proc/cpuinfo). */
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+ if (virCPUx86DataCheckFeature(cpuData, "invtsc") == 1) {
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+ VIR_DEBUG("Checking invariant TSC frequency");
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+ cpu->tsc = virHostCPUGetTscInfo();
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+ } else {
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+ VIR_DEBUG("Host CPU does not support invariant TSC");
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+ }
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+
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cleanup:
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virCPUx86DataFree(cpuData);
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return ret;
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--
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2.21.0
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