This bug was fixed in the package linux-azure - 5.15.0-1003.4

---------------
linux-azure (5.15.0-1003.4) jammy; urgency=medium

  * jammy/linux-azure: 5.15.0-1003.4 -proposed tracker (LP: #1966481)

  * Azure: not enough RAM under 4GB for CVM (LP: #1967166)
    - SAUCE: azure: Swiotlb: Add swiotlb_alloc_from_low_pages switch
    - SAUCE: azure: x86/hyperv: Make swiotlb bounce buffer allocation not just
      from low pages

  * linux-azure: arm64 network performance improvement (LP: #1966098)
    - SAUCE: azure: ACPI: scan: Export acpi_get_dma_attr()
    - SAUCE: azure: dma-mapping: Add wrapper function to set dma_coherent
    - SAUCE: azure: Drivers: hv: vmbus: Propagate VMbus coherence to each VMbus
      device
    - SAUCE: azure: PCI: hv: Propagate coherence from VMbus device to PCI device

  [ Ubuntu: 5.15.0-25.25 ]

  * jammy/linux: 5.15.0-25.25 -proposed tracker (LP: #1967146)
  * Miscellaneous Ubuntu changes
    - SAUCE: Revert "scsi: core: Reallocate device's budget map on queue depth
      change"

  [ Ubuntu: 5.15.0-24.24 ]

  * jammy/linux: 5.15.0-24.24 -proposed tracker (LP: #1966305)
  * Update OS policy capability handshake (LP: #1966089)
    - thermal: int340x: Update OS policy capability handshake
  * Jammy update: v5.15.30 upstream stable release (LP: #1966057)
    - Revert "xfrm: state and policy should fail if XFRMA_IF_ID 0"
    - arm64: dts: rockchip: fix rk3399-puma-haikou USB OTG mode
    - xfrm: Check if_id in xfrm_migrate
    - xfrm: Fix xfrm migrate issues when address family changes
    - arm64: dts: rockchip: fix rk3399-puma eMMC HS400 signal integrity
    - arm64: dts: rockchip: align pl330 node name with dtschema
    - arm64: dts: rockchip: reorder rk3399 hdmi clocks
    - arm64: dts: agilex: use the compatible "intel,socfpga-agilex-hsotg"
    - ARM: dts: rockchip: reorder rk322x hmdi clocks
    - ARM: dts: rockchip: fix a typo on rk3288 crypto-controller
    - mac80211: refuse aggregations sessions before authorized
    - MIPS: smp: fill in sibling and core maps earlier
    - ARM: 9178/1: fix unmet dependency on BITREVERSE for HAVE_ARCH_BITREVERSE
    - Bluetooth: hci_core: Fix leaking sent_cmd skb
    - can: rcar_canfd: rcar_canfd_channel_probe(): register the CAN device when
      fully ready
    - atm: firestream: check the return value of ioremap() in fs_init()
    - iwlwifi: don't advertise TWT support
    - drm/vrr: Set VRR capable prop only if it is attached to connector
    - nl80211: Update bss channel on channel switch for P2P_CLIENT
    - tcp: make tcp_read_sock() more robust
    - sfc: extend the locking on mcdi->seqno
    - bnx2: Fix an error message
    - kselftest/vm: fix tests build with old libc
    - x86/module: Fix the paravirt vs alternative order
    - ice: Fix race condition during interface enslave
    - Linux 5.15.30
  * Jammy update: v5.15.29 upstream stable release (LP: #1966056)
    - arm64: dts: qcom: sm8350: Describe GCC dependency clocks
    - arm64: dts: qcom: sm8350: Correct UFS symbol clocks
    - HID: elo: Revert USB reference counting
    - HID: hid-thrustmaster: fix OOB read in thrustmaster_interrupts
    - ARM: boot: dts: bcm2711: Fix HVS register range
    - clk: qcom: gdsc: Add support to update GDSC transition delay
    - clk: qcom: dispcc: Update the transition delay for MDSS GDSC
    - HID: vivaldi: fix sysfs attributes leak
    - arm64: dts: armada-3720-turris-mox: Add missing ethernet0 alias
    - tipc: fix kernel panic when enabling bearer
    - vdpa/mlx5: add validation for VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET command
    - vduse: Fix returning wrong type in vduse_domain_alloc_iova()
    - net: phy: meson-gxl: fix interrupt handling in forced mode
    - mISDN: Fix memory leak in dsp_pipeline_build()
    - vhost: fix hung thread due to erroneous iotlb entries
    - virtio-blk: Don't use MAX_DISCARD_SEGMENTS if max_discard_seg is zero
    - vdpa: fix use-after-free on vp_vdpa_remove
    - isdn: hfcpci: check the return value of dma_set_mask() in setup_hw()
    - net: qlogic: check the return value of dma_alloc_coherent() in
      qed_vf_hw_prepare()
    - esp: Fix possible buffer overflow in ESP transformation
    - esp: Fix BEET mode inter address family tunneling on GSO
    - qed: return status of qed_iov_get_link
    - smsc95xx: Ignore -ENODEV errors when device is unplugged
    - gpiolib: acpi: Convert ACPI value of debounce to microseconds
    - drm/sun4i: mixer: Fix P010 and P210 format numbers
    - net: dsa: mt7530: fix incorrect test in mt753x_phylink_validate()
    - ARM: dts: aspeed: Fix AST2600 quad spi group
    - iavf: Fix handling of vlan strip virtual channel messages
    - i40e: stop disabling VFs due to PF error responses
    - ice: stop disabling VFs due to PF error responses
    - ice: Fix error with handling of bonding MTU
    - ice: Don't use GFP_KERNEL in atomic context
    - ice: Fix curr_link_speed advertised speed
    - ethernet: Fix error handling in xemaclite_of_probe
    - tipc: fix incorrect order of state message data sanity check
    - net: ethernet: ti: cpts: Handle error for clk_enable
    - net: ethernet: lpc_eth: Handle error for clk_enable
    - net: marvell: prestera: Add missing of_node_put() in
      prestera_switch_set_base_mac_addr
    - ax25: Fix NULL pointer dereference in ax25_kill_by_device
    - net/mlx5: Fix size field in bufferx_reg struct
    - net/mlx5: Fix a race on command flush flow
    - net/mlx5e: Lag, Only handle events from highest priority multipath entry
    - NFC: port100: fix use-after-free in port100_send_complete
    - selftests: pmtu.sh: Kill tcpdump processes launched by subshell.
    - selftests: pmtu.sh: Kill nettest processes launched in subshell.
    - gpio: ts4900: Do not set DAT and OE together
    - gianfar: ethtool: Fix refcount leak in gfar_get_ts_info
    - net: phy: DP83822: clear MISR2 register to disable interrupts
    - sctp: fix kernel-infoleak for SCTP sockets
    - net: bcmgenet: Don't claim WOL when its not available
    - net: phy: meson-gxl: improve link-up behavior
    - selftests/bpf: Add test for bpf_timer overwriting crash
    - swiotlb: fix info leak with DMA_FROM_DEVICE
    - usb: dwc3: pci: add support for the Intel Raptor Lake-S
    - pinctrl: tigerlake: Revert "Add Alder Lake-M ACPI ID"
    - KVM: Fix lockdep false negative during host resume
    - kvm: x86: Disable KVM_HC_CLOCK_PAIRING if tsc is in always catchup mode
    - spi: rockchip: Fix error in getting num-cs property
    - spi: rockchip: terminate dma transmission when slave abort
    - drm/vc4: hdmi: Unregister codec device on unbind
    - x86/kvm: Don't use pv tlb/ipi/sched_yield if on 1 vCPU
    - net-sysfs: add check for netdevice being present to speed_show
    - hwmon: (pmbus) Clear pmbus fault/warning bits after read
    - PCI: Mark all AMD Navi10 and Navi14 GPU ATS as broken
    - gpio: Return EPROBE_DEFER if gc->to_irq is NULL
    - drm/amdgpu: bypass tiling flag check in virtual display case (v2)
    - Revert "xen-netback: remove 'hotplug-status' once it has served its 
purpose"
    - Revert "xen-netback: Check for hotplug-status existence before watching"
    - ipv6: prevent a possible race condition with lifetimes
    - tracing: Ensure trace buffer is at least 4096 bytes large
    - tracing/osnoise: Make osnoise_main to sleep for microseconds
    - selftest/vm: fix map_fixed_noreplace test failure
    - selftests/memfd: clean up mapping in mfd_fail_write
    - ARM: Spectre-BHB: provide empty stub for non-config
    - fuse: fix fileattr op failure
    - fuse: fix pipe buffer lifetime for direct_io
    - staging: rtl8723bs: Fix access-point mode deadlock
    - staging: gdm724x: fix use after free in gdm_lte_rx()
    - net: macb: Fix lost RX packet wakeup race in NAPI receive
    - riscv: alternative only works on !XIP_KERNEL
    - mmc: meson: Fix usage of meson_mmc_post_req()
    - riscv: Fix auipc+jalr relocation range checks
    - tracing/osnoise: Force quiescent states while tracing
    - arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0
    - arm64: Ensure execute-only permissions are not allowed without EPAN
    - arm64: kasan: fix include error in MTE functions
    - swiotlb: rework "fix info leak with DMA_FROM_DEVICE"
    - KVM: x86/mmu: kvm_faultin_pfn has to return false if pfh is returned
    - virtio: unexport virtio_finalize_features
    - virtio: acknowledge all features before access
    - net/mlx5: Fix offloading with ESWITCH_IPV4_TTL_MODIFY_ENABLE
    - ARM: fix Thumb2 regression with Spectre BHB
    - watch_queue: Fix filter limit check
    - watch_queue, pipe: Free watchqueue state after clearing pipe ring
    - watch_queue: Fix to release page in ->release()
    - watch_queue: Fix to always request a pow-of-2 pipe ring size
    - watch_queue: Fix the alloc bitmap size to reflect notes allocated
    - watch_queue: Free the alloc bitmap when the watch_queue is torn down
    - watch_queue: Fix lack of barrier/sync/lock between post and read
    - watch_queue: Make comment about setting ->defunct more accurate
    - x86/boot: Fix memremap of setup_indirect structures
    - x86/boot: Add setup_indirect support in early_memremap_is_setup_data()
    - x86/sgx: Free backing memory after faulting the enclave page
    - x86/traps: Mark do_int3() NOKPROBE_SYMBOL
    - drm/panel: Select DRM_DP_HELPER for DRM_PANEL_EDP
    - btrfs: make send work with concurrent block group relocation
    - drm/i915: Workaround broken BIOS DBUF configuration on TGL/RKL
    - riscv: dts: k210: fix broken IRQs on hart1
    - block: drop unused includes in <linux/genhd.h>
    - Revert "net: dsa: mv88e6xxx: flush switchdev FDB workqueue before removing
      VLAN"
    - vhost: allow batching hint without size
    - Linux 5.15.29
  * Jammy update: v5.15.28 upstream stable release (LP: #1966055)
    - slip: fix macro redefine warning
    - ARM: fix co-processor register typo
    - ARM: Do not use NOCROSSREFS directive with ld.lld
    - arm64: Do not include __READ_ONCE() block in assembly files
    - ARM: fix build warning in proc-v7-bugs.c
    - xen/xenbus: don't let xenbus_grant_ring() remove grants in error case
    - xen/grant-table: add gnttab_try_end_foreign_access()
    - xen/blkfront: don't use gnttab_query_foreign_access() for mapped status
    - xen/netfront: don't use gnttab_query_foreign_access() for mapped status
    - xen/scsifront: don't use gnttab_query_foreign_access() for mapped status
    - xen/gntalloc: don't use gnttab_query_foreign_access()
    - xen: remove gnttab_query_foreign_access()
    - xen/9p: use alloc/free_pages_exact()
    - xen/pvcalls: use alloc/free_pages_exact()
    - xen/gnttab: fix gnttab_end_foreign_access() without page specified
    - xen/netfront: react properly to failing gnttab_end_foreign_access_ref()
    - Revert "ACPI: PM: s2idle: Cancel wakeup before dispatching EC GPE"
    - Linux 5.15.28
  * zfcpdump-kernel update to v5.15 (LP: #1965766)
    - SAUCE: Audit: Fix incorrect static inline function declration.
  * [22.04 FEAT] SMC-R v2 Support (LP: #1929035)
    - net/smc: save stack space and allocate smc_init_info
    - net/smc: prepare for SMC-Rv2 connection
    - net/smc: add SMC-Rv2 connection establishment
    - net/smc: add listen processing for SMC-Rv2
    - net/smc: add v2 format of CLC decline message
    - net/smc: retrieve v2 gid from IB device
    - net/smc: add v2 support to the work request layer
    - net/smc: extend LLC layer for SMC-Rv2
    - net/smc: add netlink support for SMC-Rv2
    - net/smc: stop links when their GID is removed
    - net/smc: fix kernel panic caused by race of smc_sock
    - net/smc: Fix hung_task when removing SMC-R devices
  * [22.04 FEAT] Transparent PCI device recovery (LP: #1959532)
    - s390/pci: tolerate inconsistent handle in recover
    - s390/pci: add simpler s390dbf traces for events
    - s390/pci: refresh function handle in iomap
    - s390/pci: implement reset_slot for hotplug slot
    - PCI: Export pci_dev_lock()
    - s390/pci: implement minimal PCI error recovery
  * Mute/mic LEDs no function on some HP platfroms (LP: #1965080)
    - ALSA: hda/realtek: fix right sounds and mute/micmute LEDs for HP machines
  * [22.04 FEAT] smc: Add User-defined EID (Enterprise ID) Support - kernel
    (LP: #1929060)
    - net/smc: add support for user defined EIDs
    - net/smc: keep static copy of system EID
    - net/smc: add generic netlink support for system EID
  * Rotate to 2021v1 signing key (LP: #1964990)
    - [Packaging] Rotate to 2021v1 signing key
  * [22.04 FEAT] zcrypt DD: Exploitation Support of new IBM Z Crypto Hardware
    (kernel part) (LP: #1959547)
    - s390/zcrypt: rework of debug feature messages
    - s390/ap/zcrypt: debug feature improvements
    - s390/zcrypt: CEX8S exploitation support
    - s390/zcrypt: handle checkstopped cards with new state
    - s390/zcrypt: Support CPRB minor version T7
    - s390/zcrypt: change reply buffer size offering
    - s390/zcrypt: Provide target domain for EP11 cprbs to scheduling function
    - s390/airq: use DMA memory for summary indicators
  * [22.04 FEAT] [VS2103] Set KVM_CAP_S390_MEM_OP_EXTENSION capability to 211
    (LP: #1963901)
    - SAUCE: Set KVM_CAP_S390_MEM_OP_EXTENSION capability to 211
  * dependency on crda obsolete according to Debian (LP: #1958918)
    - [Packaging] switch dependency from crda to wireless-regdb
  * Cirrus audio support [1028:0BB5] & [1028:0BB6] (LP: #1964748)
    - ALSA: hda/cs8409: Add new Warlock SKUs to patch_cs8409
  * Miscellaneous Ubuntu changes
    - [Packaging] mark dkms-build-configure--zfs executable
    - [Packaging] Fix bashism in dkms-build script
    - [Packaging] Always catch errors in dkms-build scripts
    - [Config] toolchain version update
  * Miscellaneous upstream changes
    - Ubuntu: remove leftover reference to ubuntu/hio driver
    - Reverting commits 61005756c824 and cdb0f8e66513 due to a conflict with
      LP#1929035. Re-pick them afterwards, which will establish the upstream
      commit content and order again.
    - Revert "UBUNTU: [Packaging] Rotate to 2021v1 signing key"

 -- Paolo Pisati <paolo.pis...@canonical.com>  Thu, 31 Mar 2022 12:00:32
+0200

** Changed in: linux-azure (Ubuntu Jammy)
       Status: Fix Committed => Fix Released

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-azure in Ubuntu.
https://bugs.launchpad.net/bugs/1967166

Title:
  Azure: not enough RAM under 4GB for CVM

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure source package in Impish:
  Fix Committed
Status in linux-azure source package in Jammy:
  Fix Released

Bug description:
  SRU Justification

  [Impact]
  Can you please include one more patchset for the "no enough RAM under 4GB" 
issue for the v5.13 kernel (and v5.15 kernel):
  https://lwn.net/ml/linux-kernel/20220209122302.213882-2-ltyker...@gmail.com/
  https://lwn.net/ml/linux-kernel/20220209122302.213882-3-ltyker...@gmail.com/

  Without the two patches, currently the 5.13 kernel (and 5.15 kernel)
  can't boot as a CVM guest on Azure. :-(

  The background is: currently an Azure host only provides about 900 MB
  memory below the 4GB boundary while the swiotlb code (which is
  required by the CVM patchset) needs to allocate memory of a size of
  MIN(1GB, 6% of the total memory). There will be an Azure host update,
  with which the host will provide about 3GB memory below the 4GB
  boundary, but we still need to wait a few more weeks to know the ETA.
  Currently the above two patches can work around the issue from the
  guest side.

  [Test Case]

  Microsoft tested

  [Where things could go wrong]

  These patches could affect non-CVM instances.

  [Other Info]

  SF: #00323683

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