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| author |   James Morse <james.morse@arm.com> | 2020-02-21 16:21:05 +0000 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2020-04-17 19:35:01 +0200 |
| commit | 9fe0450785abbc04b0ed5d3cf61fcdb8ab656b4b (patch) | |
| tree | 1baece2c2f27fde5de61b47135062863a010985d /arch/x86/kernel/cpu/resctrl/core.c | |
| parent | x86/resctrl: Fix invalid attempt at removing the default resource group (diff) | |
| download | wireguard-linux-9fe0450785abbc04b0ed5d3cf61fcdb8ab656b4b.tar.xz wireguard-linux-9fe0450785abbc04b0ed5d3cf61fcdb8ab656b4b.zip | |
x86/resctrl: Preserve CDP enable over CPU hotplug
Resctrl assumes that all CPUs are online when the filesystem is mounted,
and that CPUs remember their CDP-enabled state over CPU hotplug.
This goes wrong when resctrl's CDP-enabled state changes while all the
CPUs in a domain are offline.
When a domain comes online, enable (or disable!) CDP to match resctrl's
current setting.
Fixes: 5ff193fbde20 ("x86/intel_rdt: Add basic resctrl filesystem support")
Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20200221162105.154163-1-james.morse@arm.com
Diffstat (limited to 'arch/x86/kernel/cpu/resctrl/core.c')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c index 89049b343c7a..d8cc5223b7ce 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -578,6 +578,8 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r) d->id = id; cpumask_set_cpu(cpu, &d->cpu_mask); + rdt_domain_reconfigure_cdp(r); + if (r->alloc_capable && domain_setup_ctrlval(r, d)) { kfree(d); return; |