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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Reinette Chatre <reinette.chatre@intel.com>,
	James Morse <james.morse@arm.com>, Borislav Petkov <bp@suse.de>
Subject: [PATCH 5.5 61/65] x86/resctrl: Preserve CDP enable over CPU hotplug
Date: Mon, 20 Apr 2020 14:39:05 +0200	[thread overview]
Message-ID: <20200420121519.717649306@linuxfoundation.org> (raw)
In-Reply-To: <20200420121505.909671922@linuxfoundation.org>

From: James Morse <james.morse@arm.com>

commit 9fe0450785abbc04b0ed5d3cf61fcdb8ab656b4b upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/kernel/cpu/resctrl/core.c     |    2 ++
 arch/x86/kernel/cpu/resctrl/internal.h |    1 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |   13 +++++++++++++
 3 files changed, 16 insertions(+)

--- 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, stru
 	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;
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -601,5 +601,6 @@ bool has_busy_rmid(struct rdt_resource *
 void __check_limbo(struct rdt_domain *d, bool force_free);
 bool cbm_validate_intel(char *buf, u32 *data, struct rdt_resource *r);
 bool cbm_validate_amd(char *buf, u32 *data, struct rdt_resource *r);
+void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
 
 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1769,6 +1769,19 @@ static int set_cache_qos_cfg(int level,
 	return 0;
 }
 
+/* Restore the qos cfg state when a domain comes online */
+void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
+{
+	if (!r->alloc_capable)
+		return;
+
+	if (r == &rdt_resources_all[RDT_RESOURCE_L2DATA])
+		l2_qos_cfg_update(&r->alloc_enabled);
+
+	if (r == &rdt_resources_all[RDT_RESOURCE_L3DATA])
+		l3_qos_cfg_update(&r->alloc_enabled);
+}
+
 /*
  * Enable or disable the MBA software controller
  * which helps user specify bandwidth in MBps.



  parent reply	other threads:[~2020-04-20 12:42 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-20 12:38 [PATCH 5.5 00/65] 5.5.19-rc1 review Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 01/65] amd-xgbe: Use __napi_schedule() in BH context Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 02/65] hsr: check protocol version in hsr_newlink() Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 03/65] l2tp: Allow management of tunnels and session in user namespace Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 04/65] net: dsa: mt7530: fix tagged frames pass-through in VLAN-unaware mode Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 05/65] net: ipv4: devinet: Fix crash when add/del multicast IP with autojoin Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 06/65] net: ipv6: do not consider routes via gateways for anycast address check Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 07/65] net: phy: micrel: use genphy_read_status for KSZ9131 Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 08/65] net: qrtr: send msgs from local of same id as broadcast Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 09/65] net: revert default NAPI poll timeout to 2 jiffies Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 10/65] net: tun: record RX queue in skb before do_xdp_generic() Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 11/65] net: dsa: mt7530: move mt7623 settings out off the mt7530 Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 12/65] net: ethernet: mediatek: " Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 13/65] net/mlx5: Fix frequent ioread PCI access during recovery Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 14/65] net/mlx5e: Add missing release firmware call Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 15/65] net/mlx5e: Fix nest_level for vlan pop action Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 16/65] net/mlx5e: Fix pfnum in devlink port attribute Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 17/65] net: icmp6: do not select saddr from iif when route has prefsrc set Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 18/65] net: mscc: ocelot: fix untagged packet drops when enslaving to vlan aware bridge Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 19/65] net: stmmac: dwmac-sunxi: Provide TX and RX fifo sizes Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 20/65] Revert "ACPI: EC: Do not clear boot_ec_is_ecdt in acpi_ec_add()" Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 21/65] ovl: fix value of i_ino for lower hardlink corner case Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 22/65] scsi: ufs: Fix ufshcd_hold() caused scheduling while atomic Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 23/65] platform/chrome: cros_ec_rpmsg: Fix race with host event Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 24/65] jbd2: improve comments about freeing data buffers whose page mapping is NULL Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 25/65] acpi/nfit: improve bounds checking for func Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 26/65] perf report: Fix no branch type statistics report issue Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 27/65] pwm: pca9685: Fix PWM/GPIO inter-operation Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 28/65] net: stmmac: xgmac: Fix VLAN register handling Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 29/65] net/bpfilter: remove superfluous testing message Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 30/65] ext4: fix incorrect group count in ext4_fill_super error message Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 31/65] ext4: fix incorrect inodes per group in " Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 32/65] HID: lg-g15: Do not fail the probe when we fail to disable F# emulation Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 33/65] clk: at91: sam9x60: fix usb clock parents Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 34/65] clk: at91: usb: use proper usbs_mask Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 35/65] ARM: dts: imx7-colibri: fix muxing of usbc_det pin Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 36/65] arm64: dts: librem5-devkit: add a vbus supply to usb0 Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 37/65] usb: dwc3: gadget: Dont clear flags before transfer ended Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 38/65] ASoC: Intel: mrfld: fix incorrect check on p->sink Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 39/65] ASoC: Intel: mrfld: return error codes when an error occurs Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 40/65] ALSA: hda/realtek - Enable the headset mic on Asus FX505DT Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 41/65] ALSA: usb-audio: Filter error from connector kctl ops, too Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 42/65] ALSA: usb-audio: Dont override ignore_ctl_error value from the map Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 43/65] ALSA: usb-audio: Dont create jack controls for PCM terminals Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 44/65] ALSA: usb-audio: Check mapping at creating connector controls, too Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 45/65] arm64: vdso: dont free unallocated pages Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 46/65] keys: Fix proc_keys_next to increase position index Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 47/65] tracing: Fix the race between registering snapshot event trigger and triggering snapshot operation Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 48/65] btrfs: check commit root generation in should_ignore_root Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 49/65] nl80211: fix NL80211_ATTR_FTM_RESPONDER policy Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 50/65] mac80211: fix race in ieee80211_register_hw() Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 51/65] mac80211_hwsim: Use kstrndup() in place of kasprintf() Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 52/65] net/mlx5e: Encapsulate updating netdev queues into a function Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 53/65] net/mlx5e: Rename hw_modify to preactivate Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 54/65] net/mlx5e: Use preactivate hook to set the indirection table Greg Kroah-Hartman
2020-04-20 12:38 ` [PATCH 5.5 55/65] drm/amd/powerplay: force the trim of the mclk dpm_levels if OD is enabled Greg Kroah-Hartman
2020-04-20 12:39 ` [PATCH 5.5 56/65] drm/amdgpu: fix the hw hang during perform system reboot and reset Greg Kroah-Hartman
2020-04-20 12:39 ` [PATCH 5.5 57/65] i2c: designware: platdrv: Remove DPM_FLAG_SMART_SUSPEND flag on BYT and CHT Greg Kroah-Hartman
2020-04-20 12:39 ` [PATCH 5.5 58/65] drm/i915/perf: Do not clear pollin for small user read buffers Greg Kroah-Hartman
2020-04-20 12:39 ` [PATCH 5.5 59/65] ext4: do not zeroout extents beyond i_disksize Greg Kroah-Hartman
2020-04-20 12:39 ` [PATCH 5.5 60/65] irqchip/ti-sci-inta: Fix processing of masked irqs Greg Kroah-Hartman
2020-04-20 12:39 ` Greg Kroah-Hartman [this message]
2020-04-20 12:39 ` [PATCH 5.5 62/65] x86/resctrl: Fix invalid attempt at removing the default resource group Greg Kroah-Hartman
2020-04-20 12:39 ` [PATCH 5.5 63/65] scsi: target: remove boilerplate code Greg Kroah-Hartman
2020-04-20 12:39 ` [PATCH 5.5 64/65] scsi: target: fix hang when multiple threads try to destroy the same iscsi session Greg Kroah-Hartman
2020-04-20 12:39 ` [PATCH 5.5 65/65] x86/microcode/AMD: Increase microcode PATCH_MAX_SIZE Greg Kroah-Hartman
2020-04-20 19:01 ` [PATCH 5.5 00/65] 5.5.19-rc1 review Naresh Kamboju
2020-04-20 19:53 ` Guenter Roeck
2020-04-21  9:55 ` Jon Hunter
2020-04-21 19:56 ` shuah

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