[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux-nvidia- tegra-5.15/5.15.0-1039.39~20.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal-linux- nvidia-tegra-5.15' to 'verification-done-focal-linux-nvidia-tegra-5.15'. If the problem still exists, change the tag 'verification-needed-focal- linux-nvidia-tegra-5.15' to 'verification-failed-focal-linux-nvidia- tegra-5.15'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-focal-linux-nvidia-tegra-5.15-v2 verification-needed-focal-linux-nvidia-tegra-5.15 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux-mtk/5.15.0-1039.47 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-mtk' to 'verification-done-jammy- linux-mtk'. If the problem still exists, change the tag 'verification- needed-jammy-linux-mtk' to 'verification-failed-jammy-linux-mtk'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-jammy-linux-mtk-v2 verification-needed-jammy-linux-mtk -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux- aws-6.11/6.11.0-1013.14~24.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux- aws-6.11' to 'verification-done-noble-linux-aws-6.11'. If the problem still exists, change the tag 'verification-needed-noble-linux-aws-6.11' to 'verification-failed-noble-linux-aws-6.11'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-aws-6.11-v2 verification-needed-noble-linux-aws-6.11 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
** Tags added: kernel-daily-bug -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux-azure- nvidia/6.8.0-1014.15 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-azure-nvidia' to 'verification-done-noble-linux-azure-nvidia'. If the problem still exists, change the tag 'verification-needed-noble-linux-azure-nvidia' to 'verification-failed-noble-linux-azure-nvidia'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-azure-nvidia-v2 verification-needed-noble-linux-azure-nvidia -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux-nvidia-tegra- igx/5.15.0-1021.21 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-nvidia-tegra- igx' to 'verification-done-jammy-linux-nvidia-tegra-igx'. If the problem still exists, change the tag 'verification-needed-jammy-linux-nvidia- tegra-igx' to 'verification-failed-jammy-linux-nvidia-tegra-igx'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-jammy-linux-nvidia-tegra-igx-v2 verification-needed-jammy-linux-nvidia-tegra-igx -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux-nvidia- tegra/5.15.0-1033.33 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-nvidia-tegra' to 'verification-done-jammy-linux-nvidia-tegra'. If the problem still exists, change the tag 'verification-needed-jammy-linux-nvidia-tegra' to 'verification-failed-jammy-linux-nvidia-tegra'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-jammy-linux-nvidia-tegra-v2 verification-needed-jammy-linux-nvidia-tegra -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux- azure-6.11/6.11.0-1012.12~24.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux- azure-6.11' to 'verification-done-noble-linux-azure-6.11'. If the problem still exists, change the tag 'verification-needed-noble-linux- azure-6.11' to 'verification-failed-noble-linux-azure-6.11'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-azure-6.11-v2 verification-needed-noble-linux-azure-6.11 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux- nvidia-6.11/6.11.0-1004.4 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-nvidia-6.11' to 'verification-done-noble-linux-nvidia-6.11'. If the problem still exists, change the tag 'verification-needed-noble-linux-nvidia-6.11' to 'verification-failed-noble-linux-nvidia-6.11'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-nvidia-6.11-v2 verification-needed-noble-linux-nvidia-6.11 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux-azure/6.8.0-1025.30 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-azure' to 'verification-done-noble- linux-azure'. If the problem still exists, change the tag 'verification- needed-noble-linux-azure' to 'verification-failed-noble-linux-azure'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-azure-v2 verification-needed-noble-linux-azure -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux- gcp-6.11/6.11.0-1011.11~24.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux- gcp-6.11' to 'verification-done-noble-linux-gcp-6.11'. If the problem still exists, change the tag 'verification-needed-noble-linux-gcp-6.11' to 'verification-failed-noble-linux-gcp-6.11'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-gcp-6.11-v2 verification-needed-noble-linux-gcp-6.11 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux-nvidia-tegra- pvw/6.8.0-1004.4 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-nvidia-tegra-pvw' to 'verification-done-noble-linux-nvidia-tegra-pvw'. If the problem still exists, change the tag 'verification-needed-noble-linux-nvidia-tegra- pvw' to 'verification-failed-noble-linux-nvidia-tegra-pvw'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-nvidia-tegra-pvw-v2 verification-needed-noble-linux-nvidia-tegra-pvw -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux-nvidia- tegra/6.8.0-1003.3 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-nvidia-tegra' to 'verification-done-noble-linux-nvidia-tegra'. If the problem still exists, change the tag 'verification-needed-noble-linux-nvidia-tegra' to 'verification-failed-noble-linux-nvidia-tegra'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-nvidia-tegra-v2 verification-needed-noble-linux-nvidia-tegra -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug was fixed in the package linux - 5.15.0-133.144
---
linux (5.15.0-133.144) jammy; urgency=medium
* CVE-2025-0927
- SAUCE: fs: hfs/hfsplus: add key_len boundary check to hfs_bnode_read_key
linux (5.15.0-132.143) jammy; urgency=medium
* jammy/linux: 5.15.0-132.143 -proposed tracker (LP: #2093735)
* Packaging resync (LP: #1786013)
- [Packaging] debian.master/dkms-versions -- update from kernel-versions
(main/2025.01.13)
* KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-
Exit (LP: #2093146)
- kvm: x86: Fix xstate_required_size() to follow XSTATE alignment rule
- KVM: x86: Cache CPUID.0xD XSTATE offsets+sizes during module init
* Jammy update: v5.15.173 upstream stable release (LP: #2089541)
- 9p: Avoid creating multiple slab caches with the same name
- irqchip/ocelot: Fix trigger register address
- block: Fix elevator_get_default() checking for NULL q->tag_set
- HID: multitouch: Add support for B2402FVA track point
- HID: multitouch: Add quirk for HONOR MagicBook Art 14 touchpad
- bpf: use kvzmalloc to allocate BPF verifier environment
- crypto: marvell/cesa - Disable hash algorithms
- sound: Make CONFIG_SND depend on INDIRECT_IOMEM instead of UML
- drm/vmwgfx: Limit display layout ioctl array size to
VMWGFX_NUM_DISPLAY_UNITS
- powerpc/powernv: Free name on error in opal_event_init()
- vDPA/ifcvf: Fix pci_read_config_byte() return code handling
- fs: Fix uninitialized value issue in from_kuid and from_kgid
- HID: multitouch: Add quirk for Logitech Bolt receiver w/ Casa touchpad
- HID: lenovo: Add support for Thinkpad X1 Tablet Gen 3 keyboard
- net: usb: qmi_wwan: add Fibocom FG132 0x0112 composition
- md/raid10: improve code of mrdev in raid10_sync_request
- mm/memory: add non-anonymous page check in the copy_present_page()
- udf: Allocate name buffer in directory iterator on heap
- udf: Avoid directory type conversion failure due to ENOMEM
- 9p: fix slab cache name creation for real
- Linux 5.15.173
* Jammy update: v5.15.173 upstream stable release (LP: #2089541) //
CVE-2024-41080
- io_uring: fix possible deadlock in io_register_iowq_max_workers()
* Jammy update: v5.15.172 upstream stable release (LP: #2089533)
- arm64: dts: rockchip: Fix rt5651 compatible value on rk3399-sapphire-
excavator
- arm64: dts: rockchip: Remove hdmi's 2nd interrupt on rk3328
- arm64: dts: rockchip: Fix bluetooth properties on Rock960 boards
- arm64: dts: rockchip: Remove #cooling-cells from fan on Theobroma lion
- arm64: dts: rockchip: Fix LED triggers on rk3308-roc-cc
- arm64: dts: imx8mp: correct sdhc ipg clk
- ARM: dts: rockchip: fix rk3036 acodec node
- ARM: dts: rockchip: drop grf reference from rk3036 hdmi
- ARM: dts: rockchip: Fix the spi controller on rk3036
- ARM: dts: rockchip: Fix the realtek audio codec on rk3036-kylin
- NFSv3: only use NFS timeout for MOUNT when protocols are compatible
- NFS: Add a tracepoint to show the results of nfs_set_cache_invalid()
- NFSv3: handle out-of-order write replies.
- nfs: avoid i_lock contention in nfs_clear_invalid_mapping
- net: enetc: set MAC address to the VF net_device
- can: c_can: fix {rx,tx}_errors statistics
- net: phy: ti: add PHY_RST_AFTER_CLK_EN flag
- net: stmmac: Fix unbalanced IRQ wake disable warning on single irq case
- Revert "ALSA: hda/conexant: Mute speakers at suspend / shutdown"
- media: stb0899_algo: initialize cfr before using it
- media: dvb_frontend: don't play tricks with underflow values
- media: adv7604: prevent underflow condition when reporting colorspace
- scsi: sd_zbc: Use kvzalloc() to allocate REPORT ZONES buffer
- ALSA: firewire-lib: fix return value on fail in amdtp_tscm_init()
- media: pulse8-cec: fix data timestamp at pulse8_setup()
- media: v4l2-ctrls-api: fix error handling for v4l2_g_ctrl()
- pwm: imx-tpm: Use correct MODULO value for EPWM mode
- drm/amdgpu: Adjust debugfs eviction and IB access permissions
- drm/amdgpu: prevent NULL pointer dereference if ATIF is not supported
- thermal/drivers/qcom/lmh: Remove false lockdep backtrace
- dm cache: correct the number of origin blocks to match the target length
- dm cache: optimize dirty bit checking with find_next_bit when resizing
- dm-unstriped: cast an operand to sector_t to prevent potential uint32_t
overflow
- ALSA: usb-audio: Add quirk for HP 320 FHD Webcam
- posix-cpu-timers: Clear TICK_DEP_BIT_POSIX_TIMER on clone
- io_uring: rename kiocb_end_write() local helper
- fs: create kiocb_{start,end}_write() helpers
- io_uring: use kiocb_{start,end}_write() helpers
- media: uvcvideo: Skip parsing frames of type UVC_VS_UNDEFINED in
uvc_parse_format
- fs/proc: fix compile warning about variable 'vmcore_mmap_ops'
- usb: dwc3:
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug was fixed in the package linux - 6.8.0-53.55
---
linux (6.8.0-53.55) noble; urgency=medium
* noble/linux: 6.8.0-53.55 -proposed tracker (LP: #2093677)
* Packaging resync (LP: #1786013)
- [Packaging] debian.master/dkms-versions -- update from kernel-versions
(main/2025.01.13)
* generate and ship vmlinux.h to allow packages to build BPF CO-RE
(LP: #2050083)
- [Packaging] add linux-bpf-dev package
- [Packaging] do not attempt to generate BTF header on armhf
* Unable to boot as a guest on VMware ESX (LP: #2091941)
- ptp/vmware: Use VMware hypercall API
- input/vmmouse: Use VMware hypercall API
- drm/vmwgfx: Use VMware hypercall API
- x86/vmware: Use VMware hypercall API
- x86/vmware: Correct macro names
- x86/vmware: Remove legacy VMWARE_HYPERCALL* macros
* When /dev/vmbus/hv_kvp is not present, disable hv-kvp-daemon (LP: #2091744)
- [Packaging] disable hv-kvp-daemon if needed
* Backport "netkit: Add option for scrubbing skb meta data" to 6.8
(LP: #2091184)
- netkit: Add option for scrubbing skb meta data
* KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-
Exit (LP: #2093146)
- KVM: x86: Cache CPUID.0xD XSTATE offsets+sizes during module init
* [SRU] add support of QCA BT 0489:e0fc (LP: #2085406)
- Bluetooth: btusb: add Foxconn 0xe0fc for Qualcomm WCN785x
* ice driver RTNL assertion failed warning on shutdown/reboot (LP: #2091107)
- ice: Remove and readd netdev during devlink reload
* vfio_pci soft lockup on VM start while using PCIe passthrough (LP: #2089306)
- SAUCE: Revert "vfio/pci: Insert full vma on mmap'd MMIO fault"
- SAUCE: Revert "vfio/pci: Use unmap_mapping_range()"
* [SRU] Fix error of resume on rtl8168fp (LP: #2087507)
- r8169: avoid unsolicited interrupts
* [SRU] power: intel_pstate: HWP interrupt support for maximum ratio changed
(LP: #2090852)
- x86/cpufeatures: Add HWP highest perf change feature flag
- cpufreq: intel_pstate: Support highest performance change interrupt
* Noble update: upstream stable patchset 2024-11-29 (LP: #2089884)
- static_call: Handle module init failure correctly in
static_call_del_module()
- static_call: Replace pointless WARN_ON() in static_call_module_notify()
- jump_label: Simplify and clarify static_key_fast_inc_cpus_locked()
- jump_label: Fix static_key_slow_dec() yet again
- scsi: st: Fix input/output error on empty drive reset
- scsi: pm8001: Do not overwrite PCI queue mapping
- drm/amdgpu: Fix get each xcp macro
- mailbox: rockchip: fix a typo in module autoloading
- mailbox: bcm2835: Fix timeout during suspend mode
- ceph: remove the incorrect Fw reference check when dirtying pages
- ieee802154: Fix build error
- net: sparx5: Fix invalid timestamps
- net/mlx5: Fix error path in multi-packet WQE transmit
- net/mlx5: Added cond_resched() to crdump collection
- net/mlx5e: Fix NULL deref in mlx5e_tir_builder_alloc()
- net/mlx5e: Fix crash caused by calling __xfrm_state_delete() twice
- netfilter: uapi: NFTA_FLOWTABLE_HOOK is NLA_NESTED
- net: ieee802154: mcr20a: Use IRQF_NO_AUTOEN flag in request_irq()
- net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable()
- selftests: netfilter: Fix nft_audit.sh for newer nft binaries
- netfilter: nf_tables: prevent nf_skb_duplicated corruption
- Bluetooth: MGMT: Fix possible crash on mgmt_index_removed
- Bluetooth: MGMT: Fix possible deadlocks
- Bluetooth: L2CAP: Fix uaf in l2cap_connect
- Bluetooth: hci_core: Fix calling mgmt_device_connected
- Bluetooth: btmrvl: Use IRQF_NO_AUTOEN flag in request_irq()
- net: Add netif_get_gro_max_size helper for GRO
- net: Fix gso_features_check to check for both dev->gso_{ipv4_,}max_size
- net: ethernet: lantiq_etop: fix memory disclosure
- net: fec: Restart PPS after link state change
- net: fec: Reload PTP registers after link-state change
- net: avoid potential underflow in qdisc_pkt_len_init() with UFO
- net: add more sanity checks to qdisc_pkt_len_init()
- net: stmmac: dwmac4: extend timeout for VLAN Tag register busy bit check
- ipv4: ip_gre: Fix drops of small packets in ipgre_xmit
- net: test for not too small csum_start in virtio_net_hdr_to_skb()
- ppp: do not assume bh is held in ppp_channel_bridge_input()
- iomap: constrain the file range passed to iomap_file_unshare
- dt-bindings: net: xlnx,axi-ethernet: Add missing reg minItems
- sctp: set sk_state back to CLOSED if autobind fails in sctp_listen_start
- i2c: xiic: improve error message when transfer fails to start
- i2c: xiic: Try re-initialization on bus busy timeout
- loop: don't set QUEUE_FLAG_NOMERGES
- ASoC: atmel: mchp-pdmc: Skip ALSA restoration if substream runtime is
uninitialized
- ALSA: mixer_oss: Remove some incorrect kfree_const() usages
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux-intel/6.11.0-1007.7 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-oracular-linux-intel' to 'verification-done- oracular-linux-intel'. If the problem still exists, change the tag 'verification-needed-oracular-linux-intel' to 'verification-failed- oracular-linux-intel'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-oracular-linux-intel-v2 verification-needed-oracular-linux-intel -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
Performing verification for Jammy I deployed a bare metal host, and installed a KVM stack just like the testcase section. Sapphire Rapids Intel(R) Xeon(R) Platinum 8468 22.04 LTS Jammy 5.15.0-130-generic Outside VM cpuid 2784 cpuid 2699 cpuid 2699 cpuid 2797 cpuid 2866 Inside VM cpuid 52891 cpuid 51100 cpuid 50767 cpuid 55294 cpuid 52449 I then enabled -proposed on both the bare metal system and the VM, and installed 5.15.0-132-generic. $ uname -rv 5.15.0-132-generic #143-Ubuntu SMP Wed Jan 15 20:39:05 UTC 2025 I then re-ran the tests: 5.15.0-132-generic Outside VM cpuid 2698 cpuid 2700 cpuid 2698 cpuid 2797 cpuid 2869 Inside VM cpuid 20481 cpuid 20541 cpuid 20494 cpuid 20444 cpuid 20474 As we can see, Outside VM testcases are stable, while Inside VM performance has improved by what we expected, going from around 52,000 to 20,000. The kernel in -proposed solves the problem, happy to mark verified for Jammy. ** Tags removed: verification-needed-jammy-linux ** Tags added: verification-done-jammy-linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
Performing verification for Noble I deployed a bare metal host, and installed a KVM stack just like the testcase section. Sapphire Rapids Intel(R) Xeon(R) Platinum 8468 24.04 LTS Noble 6.8.0-51-generic Outside VM cpuid 3528 cpuid 3526 cpuid 3444 cpuid 3360 cpuid 3268 Inside VM cpuid 66278 cpuid 70955 cpuid 67065 cpuid 69456 cpuid 68781 I then enabled -proposed on both the bare metal system and the VM, and installed 6.8.0-53-generic. $ uname -rv 6.8.0-53-generic #55-Ubuntu SMP PREEMPT_DYNAMIC Fri Jan 17 15:37:52 UTC 2025 I then re-ran the tests: 6.8.0-53-generic Outside VM cpuid 3353 cpuid 3367 cpuid 3270 cpuid 3304 cpuid 3245 Inside VM cpuid 23412 cpuid 24049 cpuid 23952 cpuid 23439 cpuid 23995 As we can see, Outside VM testcases are stable, while Inside VM performance has improved by what we expected, going from around 69,000 to 23,000. The kernel in -proposed solves the problem, happy to mark verified for Noble. ** Tags removed: verification-needed-noble-linux ** Tags added: verification-done-noble-linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
Performing verification for Oracular I deployed a bare metal host, and installed a KVM stack just like the testcase section. Sapphire Rapids Intel(R) Xeon(R) Platinum 8468 24.10 Oracular 6.11.0-13-generic Outside VM cpuid 3368 cpuid 3399 cpuid 3560 cpuid 3282 cpuid 3289 Inside VM cpuid 66195 cpuid 67674 cpuid 69635 cpuid 70856 cpuid 64587 I then enabled -proposed on both the bare metal system and the VM, and installed 6.11.0-17-generic. $ uname -rv 6.11.0-17-generic #17-Ubuntu SMP PREEMPT_DYNAMIC Thu Jan 16 23:58:35 UTC 2025 I then re-ran the tests: 6.11.0-17-generic Outside VM cpuid 3374 cpuid 3298 cpuid 3325 cpuid 3448 cpuid 3470 Inside VM cpuid 23193 cpuid 23517 cpuid 23774 cpuid 23993 cpuid 23754 As we can see, Outside VM testcases are stable, while Inside VM performance has improved by what we expected, going from around 68,000 to 23,000. The kernel in -proposed solves the problem, happy to mark verified for Oracular. ** Tags removed: verification-needed-oracular-linux ** Tags added: verification-done-oracular-linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux/6.8.0-53.55 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux' to 'verification-done-noble-linux'. If the problem still exists, change the tag 'verification-needed-noble- linux' to 'verification-failed-noble-linux'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-v2 verification-needed-noble-linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux/6.11.0-17.17 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-oracular-linux' to 'verification-done-oracular- linux'. If the problem still exists, change the tag 'verification- needed-oracular-linux' to 'verification-failed-oracular-linux'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-oracular-linux-v2 verification-needed-oracular-linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
This bug is awaiting verification that the linux/5.15.0-132.143 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux' to 'verification-done-jammy-linux'. If the problem still exists, change the tag 'verification-needed-jammy- linux' to 'verification-failed-jammy-linux'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-jammy-linux-v2 verification-needed-jammy-linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
** Changed in: linux (Ubuntu Oracular) Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
** Changed in: linux (Ubuntu Noble) Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
** Changed in: linux (Ubuntu Jammy) Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
Cover Letter: https://lists.ubuntu.com/archives/kernel-team/2025-January/156198.html Patches: https://lists.ubuntu.com/archives/kernel-team/2025-January/156199.html https://lists.ubuntu.com/archives/kernel-team/2025-January/156201.html https://lists.ubuntu.com/archives/kernel-team/2025-January/156200.html -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
Sapphire Rapids Intel(R) Xeon(R) Platinum 8468 22.04 LTS Jammy 5.15.0-130-generic Outside VM cpuid 2700 cpuid 2822 cpuid 2699 cpuid 2698 cpuid 2698 Inside VM cpuid 51108 cpuid 54513 cpuid 51389 cpuid 53783 cpuid 53998 5.15.0-130-generic+TEST403286v20250107b1 Outside VM cpuid 2752 cpuid 2771 cpuid 2782 cpuid 2698 cpuid 2724 Inside VM cpuid 20580 cpuid 20512 cpuid 20523 cpuid 20700 cpuid 20549 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
Sapphire Rapids Intel(R) Xeon(R) Platinum 8468 24.04 LTS Noble 6.8.0-51-generic Outside VM cpuid 3527 cpuid 3384 cpuid 3467 cpuid 3300 cpuid 3544 Inside VM cpuid 68395 cpuid 58364 cpuid 65254 cpuid 68554 cpuid 66905 6.8.0-51-generic+TEST403286v20250107b1 Outside VM cpuid 3253 cpuid 3416 cpuid 3447 cpuid 3260 cpuid 3281 Inside VM cpuid 22852 cpuid 22890 cpuid 18168 cpuid 23462 cpuid 23281 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
Sapphire Rapids Intel(R) Xeon(R) Platinum 8468 24.10 Oracular 6.11.0-13-generic Outside VM cpuid 3307 cpuid 3384 cpuid 3348 cpuid 3374 cpuid 3280 Inside VM cpuid 67659 cpuid 67748 cpuid 69626 cpuid 67772 cpuid 65224 6.11.0-13-generic+TEST403286v20250107b1 Outside VM cpuid 3450 cpuid 3499 cpuid 3293 cpuid 3507 cpuid 3459 Inside VM cpuid 23696 cpuid 23684 cpuid 23354 cpuid 23940 cpuid 24235 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
** Description changed: BugLink: https://bugs.launchpad.net/bugs/2093146 [Impact] The CPUID instruction is particularly slow on newer generation processors, with Intel's Emerald Rapids processor taking significantly longer to execute CPUID than Skylake or Icelake. This introduces significant latency into the KVM subsystem, as it frequently calls CPUID when recomputing XSTATE offsets, and especially XSAVE values, as they need to call CPUID twice for each XSAVE call. CPUID.0xD.[1..n] are constant and do not change during runtime, as they don't depend on XCR0 or XSS values, and can be saved and cached for future usage. By caching CPUID.0xD.[1..n] at kvm.ko module load, latency decreases by up to 400%. For a round trip transition between VM-Enter and VM-Exit figures from the commit log are: Skylake 11650 Icelake 22350 Emerald 28850 When you add the caching in: Skylake 6850 Icelake 9000 Emerald 7900 That's a saving of 170% for Skylake, 248% for Icelake and 365% for Emerald Rapids. [Fix] The fix is part of a 5 patch series. We will only SRU patch 1 for the moment, as it is the only one in mainline, and provides a 400% latency improvement, doing the brunt of the work. Patches 2-5 are refactors and smaller performance improvements, not yet mainlined due to needing rework, and only account for about 2.5% latency improvement, quite small, compared to what patch 1 does. The fix is: commit 1201f226c863b7da739f7420ddba818cedf372fc Author: Sean Christopherson Date: Tue Dec 10 17:32:58 2024 -0800 Subject: KVM: x86: Cache CPUID.0xD XSTATE offsets+sizes during module init Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1201f226c863b7da739f7420ddba818cedf372fc This landed in 6.13-rc3, and is currently queued up for upstream -stable 6.12, 6.6 and 6.1. This applies cleanly to noble, oracular. For jammy, it requires the below dependency, and a small backport to fix some minor context mismatches. commit cc04b6a21d431359eceeec0d812b492088b04af5 Author: Jing Liu Date: Wed Jan 5 04:35:14 2022 -0800 Subject: kvm: x86: Fix xstate_required_size() to follow XSTATE alignment rule Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc04b6a21d431359eceeec0d812b492088b04af5 - [Testcase] - 1) Install KVM Stack on Baremetal host $ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils 2) Enable nested virt $ vim /etc/modprobe.d/kvm.conf options kvm-intel nested=1 + $ sudo reboot 3) Start a VM. 4) In guest, run: + $ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils + 5) In host and the guest, run: $ sudo apt install build-essential 6) Install kvm-unit-tests and run x86/vmexit/cpuid testcase. https://gitlab.com/kvm-unit-tests/kvm-unit-tests $ git clone https://gitlab.com/kvm-unit-tests/kvm-unit-tests.git $ ./configure $ make standalone $ cd tests $ sudo -s # ACCEL=kvm ./vmexit_cpuid BUILD_HEAD=0ed2cdf3 timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel /tmp/tmp.GMVjItBglu -smp 1 -append cpuid # -initrd /tmp/tmp.uaD4VVyIqc qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.8001H:ECX.svm [bit 2] enabling apic smp: waiting for 0 APs paging enabled cr0 = 80010011 cr3 = 1007000 cr4 = 20 pci-testdev at 0x10 membar febff000 iobar c000 cpuid 66485 PASS vmexit_cpuid The numbers next to cpuid, is the (t2 = rdtsc) - (t1 = rdtsc) count. Smaller is better. A test kernel is available in the following ppa: https://launchpad.net/~mruffell/+archive/ubuntu/sf403286-test Test data for the above test kernel is: Sapphire Rapids Intel(R) Xeon(R) Platinum 8468 24.04 LTS Noble 6.8.0-51-generic Outside VM cpuid 3527 cpuid 3384 cpuid 3467 cpuid 3300 cpuid 3544 Inside VM cpuid 68395 cpuid 58364 cpuid 65254 cpuid 68554 cpuid 66905 6.8.0-51-generic+TEST403286v20250107b1 Outside VM cpuid 3253 cpuid 3416 cpuid 3447 cpuid 3260 cpuid 3281 Inside VM cpuid 22852 cpuid 22890 cpuid 18168 cpuid 23462 cpuid 23281 The number of cycles of rdtsc in a nested VM is of the same order of magnitude smaller as we are expecting. [Where problems could occur] This fix is related to nested virtualisation in the KVM subsystem. We are adding a new function, called on KVM module load, which caches the CPUID instead of fetching it every time XSAVE needs to be recomputed, which can be multiple times on VM-Enter and VM-Exit on nested guests. CPUID is static and should never change, so there should be no issues in saving a value and reusing it
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
** Description changed: BugLink: https://bugs.launchpad.net/bugs/2093146 [Impact] The CPUID instruction is particularly slow on newer generation processors, with Intel's Emerald Rapids processor taking significantly longer to execute CPUID than Skylake or Icelake. This introduces significant latency into the KVM subsystem, as it frequently calls CPUID when recomputing XSTATE offsets, and especially XSAVE values, as they need to call CPUID twice for each XSAVE call. CPUID.0xD.[1..n] are constant and do not change during runtime, as they don't depend on XCR0 or XSS values, and can be saved and cached for future usage. By caching CPUID.0xD.[1..n] at kvm.ko module load, latency decreases by up to 400%. For a round trip transition between VM-Enter and VM-Exit figures from the commit log are: Skylake 11650 Icelake 22350 Emerald 28850 When you add the caching in: Skylake 6850 Icelake 9000 Emerald 7900 That's a saving of 170% for Skylake, 248% for Icelake and 365% for Emerald Rapids. [Fix] The fix is part of a 5 patch series. We will only SRU patch 1 for the moment, as it is the only one in mainline, and provides a 400% latency improvement, doing the brunt of the work. Patches 2-5 are refactors and smaller performance improvements, not yet mainlined due to needing rework, and only account for about 2.5% latency improvement, quite small, compared to what patch 1 does. The fix is: commit 1201f226c863b7da739f7420ddba818cedf372fc Author: Sean Christopherson Date: Tue Dec 10 17:32:58 2024 -0800 Subject: KVM: x86: Cache CPUID.0xD XSTATE offsets+sizes during module init Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1201f226c863b7da739f7420ddba818cedf372fc This landed in 6.13-rc3, and is currently queued up for upstream -stable 6.12, 6.6 and 6.1. This applies cleanly to noble, oracular. For jammy, it requires the below dependency, and a small backport to fix some minor context mismatches. commit cc04b6a21d431359eceeec0d812b492088b04af5 Author: Jing Liu Date: Wed Jan 5 04:35:14 2022 -0800 Subject: kvm: x86: Fix xstate_required_size() to follow XSTATE alignment rule Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc04b6a21d431359eceeec0d812b492088b04af5 [Testcase] 1) Install KVM Stack on Baremetal host $ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils 2) Enable nested virt $ vim /etc/modprobe.d/kvm.conf options kvm-intel nested=1 3) Start a VM. - 4) Install KVM Stack in Guest - $ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils - 5) Start a VM. + 4) In guest, run: + $ sudo apt install build-essential 6) Install kvm-unit-tests and run x86/vmexit/cpuid testcase. https://gitlab.com/kvm-unit-tests/kvm-unit-tests - (To be expanded upon). + $ git clone https://gitlab.com/kvm-unit-tests/kvm-unit-tests.git + $ ./configure + $ make standalone + $ cd tests + $ sudo -s + # ACCEL=kvm ./vmexit_cpuid + BUILD_HEAD=0ed2cdf3 + timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel /tmp/tmp.GMVjItBglu -smp 1 -append cpuid # -initrd /tmp/tmp.uaD4VVyIqc + qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.8001H:ECX.svm [bit 2] + enabling apic + smp: waiting for 0 APs + paging enabled + cr0 = 80010011 + cr3 = 1007000 + cr4 = 20 + pci-testdev at 0x10 membar febff000 iobar c000 + cpuid 66485 + PASS vmexit_cpuid + + The numbers next to cpuid, is the (t2 = rdtsc) - (t1 = rdtsc) count. Smaller is + better. + + A test kernel is available in the following ppa: + + https://launchpad.net/~mruffell/+archive/ubuntu/sf403286-test + + Test data for the above test kernel is: + + Sapphire Rapids Intel(R) Xeon(R) Platinum 8468 + 24.04 LTS Noble + + 6.8.0-51-generic + + Outside VM + cpuid 3527 + cpuid 3384 + cpuid 3467 + cpuid 3300 + cpuid 3544 + + Inside VM + cpuid 68395 + cpuid 58364 + cpuid 65254 + cpuid 68554 + cpuid 66905 + + 6.8.0-51-generic+TEST403286v20250107b1 + + Outside VM + cpuid 3253 + cpuid 3416 + cpuid 3447 + cpuid 3260 + cpuid 3281 + + Inside VM + cpuid 22852 + cpuid 22890 + cpuid 18168 + cpuid 23462 + cpuid 23281 + + The number of cycles of rdtsc in a nested VM is of the same order of magnitude + smaller as we are expecting. [Where problems could occur] This fix is related to nested virtualisation in the KVM subsystem. We are adding a new function, called on KVM module load, which caches the CPUID instead of fetching it every time XSAVE needs to be recomputed, which can be multiple times on VM-Enter and VM-Exit on nested guests. CPUID is static and should never change, so there should be no issues in saving
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
** Description changed: BugLink: https://bugs.launchpad.net/bugs/2093146 [Impact] The CPUID instruction is particularly slow on newer generation processors, with Intel's Emerald Rapids processor taking significantly longer to execute CPUID than Skylake or Icelake. This introduces significant latency into the KVM subsystem, as it frequently calls CPUID when recomputing XSTATE offsets, and especially XSAVE values, as they need to call CPUID twice for each XSAVE call. CPUID.0xD.[1..n] are constant and do not change during runtime, as they don't depend on XCR0 or XSS values, and can be saved and cached for future usage. By caching CPUID.0xD.[1..n] at kvm.ko module load, latency decreases by up to 400%. For a round trip transition between VM-Enter and VM-Exit figures from the commit log are: Skylake 11650 Icelake 22350 Emerald 28850 When you add the caching in: Skylake 6850 Icelake 9000 Emerald 7900 That's a saving of 170% for Skylake, 248% for Icelake and 365% for Emerald Rapids. [Fix] The fix is part of a 5 patch series. We will only SRU patch 1 for the moment, as it is the only one in mainline, and provides a 400% latency improvement, doing the brunt of the work. Patches 2-5 are refactors and smaller performance improvements, not yet mainlined due to needing rework, and only account for about 2.5% latency improvement, quite small, compared to what patch 1 does. The fix is: commit 1201f226c863b7da739f7420ddba818cedf372fc Author: Sean Christopherson Date: Tue Dec 10 17:32:58 2024 -0800 Subject: KVM: x86: Cache CPUID.0xD XSTATE offsets+sizes during module init Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1201f226c863b7da739f7420ddba818cedf372fc + This landed in 6.13-rc3, and is currently queued up for upstream -stable 6.12, + 6.6 and 6.1. + This applies cleanly to noble, oracular. For jammy, it requires the below dependency, and a small backport to fix some minor context mismatches. commit cc04b6a21d431359eceeec0d812b492088b04af5 Author: Jing Liu Date: Wed Jan 5 04:35:14 2022 -0800 Subject: kvm: x86: Fix xstate_required_size() to follow XSTATE alignment rule Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc04b6a21d431359eceeec0d812b492088b04af5 [Testcase] 1) Install KVM Stack on Baremetal host $ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils 2) Enable nested virt $ vim /etc/modprobe.d/kvm.conf options kvm-intel nested=1 3) Start a VM. 4) Install KVM Stack in Guest $ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils 5) Start a VM. 6) Install kvm-unit-tests and run x86/vmexit/cpuid testcase. https://gitlab.com/kvm-unit-tests/kvm-unit-tests (To be expanded upon). [Where problems could occur] This fix is related to nested virtualisation in the KVM subsystem. We are adding a new function, called on KVM module load, which caches the CPUID instead of fetching it every time XSAVE needs to be recomputed, which can be multiple times on VM-Enter and VM-Exit on nested guests. CPUID is static and should never change, so there should be no issues in saving a value and reusing it later. If a regression were to occur, it would affect all KVM users, and there would be no workarounds. [Other info] Full mailing list series: https://lore.kernel.org/kvm/20241211013302.1347853-1-sea...@google.com/T/#u -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2093146] Re: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit
To reduce VM-Enter and VM-Exit latency in KVM, caching CPUID data during the kvm.ko module initialization helps minimize overhead. By storing CPU feature information, KVM avoids fetching it repeatedly, improving performance and reducing delays during VM transitions. This optimization is beneficial for workloads with frequent VM context switches. For more on KVM optimizations, visit https://betterjoy.net/. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
