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From 92b7a56b1a23d1cf39e810a58a6d7d0b1f500e69 Mon Sep 17 00:00:00 2001
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Message-Id: <92b7a56b1a23d1cf39e810a58a6d7d0b1f500e69@dist-git>
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From: Pavel Hrdina <phrdina@redhat.com>
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Date: Thu, 21 Jan 2021 10:24:06 -0300
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Subject: [PATCH] vircgroup: fix cpu quota maximum limit
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Kernel commit <d505b8af58912ae1e1a211fabc9995b19bd40828> added proper
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check for cpu quota maximum limit to prevent internal overflow.
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Even though this change is not present in all kernels it makes sense
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to enforce the same limit in libvirt.
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1750315
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
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(cherry picked from commit ed1ba69f5a8132f8c1e73d2a1f142d70de0b564a)
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https://bugzilla.redhat.com/1915733
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Signed-off-by: Daniel Henrique Barboza <dbarboza@redhat.com>
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Message-Id: <20210121132406.337681-5-dbarboza@redhat.com>
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Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
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---
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src/util/vircgroup.h | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/src/util/vircgroup.h b/src/util/vircgroup.h
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index 83fa74840f..1c6edea0be 100644
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--- a/src/util/vircgroup.h
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+++ b/src/util/vircgroup.h
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@@ -246,7 +246,9 @@ int virCgroupGetCpuShares(virCgroupPtr group, unsigned long long *shares);
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#define VIR_CGROUP_CPU_PERIOD_MIN 1000LL
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#define VIR_CGROUP_CPU_PERIOD_MAX 1000000LL
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#define VIR_CGROUP_CPU_QUOTA_MIN 1000LL
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-#define VIR_CGROUP_CPU_QUOTA_MAX 18446744073709551LL
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+/* Based on kernel code ((1ULL << MAX_BW_BITS) - 1) where MAX_BW_BITS is
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+ * (64 - BW_SHIFT) and BW_SHIFT is 20 */
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+#define VIR_CGROUP_CPU_QUOTA_MAX 17592186044415LL
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int virCgroupSetCpuCfsPeriod(virCgroupPtr group, unsigned long long cfs_period);
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int virCgroupGetCpuCfsPeriod(virCgroupPtr group, unsigned long long *cfs_period);
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--
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2.30.0
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