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[PATCH 00/16] ARMv8.3 pointer authentication userspace
by Yang Yingliang 29 Aug '20

29 Aug '20

This series adds support for the ARMv8.3 pointer authentication extension, enabling userspace return address protection with GCC 7 and above. Arnaldo Carvalho de Melo (2): tools beauty: Make the prctl option table generator catch all PR_ options tools headers uapi: Sync prctl.h with the kernel sources Kristina Martsenko (3): arm64: add comments about EC exception levels arm64: add prctl control for resetting ptrauth keys arm64: add ptrace regsets for ptrauth key management Mark Rutland (8): arm64: add pointer authentication register bits arm64/kvm: hide ptrauth from guests arm64/cpufeature: detect pointer authentication arm64: add basic pointer authentication support arm64: expose user PAC bit positions via ptrace arm64: perf: strip PAC when unwinding userspace arm64: enable pointer authentication arm64: docs: document pointer authentication Will Deacon (3): arm64: ptr auth: Move per-thread keys from thread_info to thread_struct arm64: cpufeature: Reduce number of pointer auth CPU caps from 6 to 4 arm64: cpufeature: Rework ptr auth hwcaps using multi_entry_cap_matches Documentation/arm64/booting.txt | 8 + Documentation/arm64/cpu-feature-registers.txt | 8 + Documentation/arm64/elf_hwcaps.txt | 12 ++ .../arm64/pointer-authentication.txt | 93 +++++++++ arch/arm64/Kconfig | 23 +++ arch/arm64/include/asm/cpucaps.h | 6 +- arch/arm64/include/asm/cpufeature.h | 73 +++++-- arch/arm64/include/asm/esr.h | 17 +- arch/arm64/include/asm/pointer_auth.h | 97 +++++++++ arch/arm64/include/asm/processor.h | 7 + arch/arm64/include/asm/sysreg.h | 30 +++ arch/arm64/include/uapi/asm/hwcap.h | 2 + arch/arm64/include/uapi/asm/ptrace.h | 20 ++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/cpu_errata.c | 32 --- arch/arm64/kernel/cpufeature.c | 138 +++++++++++-- arch/arm64/kernel/cpuinfo.c | 2 + arch/arm64/kernel/perf_callchain.c | 6 +- arch/arm64/kernel/pointer_auth.c | 47 +++++ arch/arm64/kernel/process.c | 4 + arch/arm64/kernel/ptrace.c | 185 ++++++++++++++++++ arch/arm64/kvm/handle_exit.c | 18 ++ arch/arm64/kvm/sys_regs.c | 8 + include/uapi/linux/elf.h | 3 + include/uapi/linux/prctl.h | 8 + kernel/sys.c | 8 + tools/include/uapi/linux/prctl.h | 8 + tools/perf/trace/beauty/prctl_option.sh | 2 +- 28 files changed, 789 insertions(+), 77 deletions(-) create mode 100644 Documentation/arm64/pointer-authentication.txt create mode 100644 arch/arm64/include/asm/pointer_auth.h create mode 100644 arch/arm64/kernel/pointer_auth.c -- 2.25.1

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[PATCH kernel-5.5 0/4] Add RISC-V log dirty support
by Yifei Jiang 27 Aug '20

27 Aug '20

euleros inclusion category: feature bugzilla: NA CVE: NA This series supports log dirty for migration in RISC-V KVM. We have implemented the vm migration in Qemu, So these patches have been tested and are valid. Link: https://gitee.com/openeuler/kernel/issues/I1SWY2 Yifei Jiang (4): riscv/kvm: Fix use VSIP_VALID_MASK mask HIP register riscv/kvm: add kvm_arch_mmu_enable_log_dirty_pt_masked riscv/kvm: implement kvm_vm_ioctl_get_dirty_log riscv/kvm: Add kvm_vm_ioctl_clear_dirty_log arch/riscv/configs/defconfig | 1 + arch/riscv/kvm/Kconfig | 1 + arch/riscv/kvm/mmu.c | 37 +++++++++++++++++++++++++++ arch/riscv/kvm/vcpu.c | 2 +- arch/riscv/kvm/vm.c | 49 ++++++++++++++++++++++++++++++++++-- 5 files changed, 87 insertions(+), 3 deletions(-) -- 2.19.1

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[PATCH] ACPI: GED: fix replace timer with delayed work
by huangjun 27 Aug '20

27 Aug '20

From: Jun Huang <huangjun63(a)huawei.com> The acpi_execute_simple_method function uses a mutex, so it cannot be called in the timer. We replace timer with delayed work. Signed-off-by: Jun Huang <huangjun63(a)huawei.com> --- drivers/acpi/evged.c | 60 ++++++++++++++++++++------------------------ 1 file changed, 27 insertions(+), 33 deletions(-) diff --git a/drivers/acpi/evged.c b/drivers/acpi/evged.c index 7354d8d..5bf65b1 100644 --- a/drivers/acpi/evged.c +++ b/drivers/acpi/evged.c @@ -34,7 +34,7 @@ * Method (_EVT, 1) { * if (Lequal(123, Arg0)) * { - * } + * }# * } * } * @@ -46,20 +46,23 @@ #include <linux/list.h> #include <linux/platform_device.h> #include <linux/acpi.h> -#include <linux/timer.h> #include <linux/jiffies.h> +#include <linux/workqueue.h> #define MODULE_NAME "acpi-ged" +static void gpp_enable_pwd(struct work_struct *private_); + +static DECLARE_DELAYED_WORK(gpp_work, gpp_enable_pwd); + struct acpi_ged_handle { - struct timer_list timer; /* For 4s anti-shake of power button */ acpi_handle gpp_handle; /* ACPI Handle: enable shutdown */ acpi_handle gpo_handle; /* ACPI Handle: set sleep flag */ }; struct acpi_ged_device { struct device *dev; - struct acpi_ged_handle *wakeup_handle; + struct acpi_ged_handle *ged_handle; struct list_head event_list; }; @@ -71,6 +74,8 @@ struct acpi_ged_event { acpi_handle handle; }; +static struct acpi_ged_handle *wakeup_handle; + static irqreturn_t acpi_ged_irq_handler(int irq, void *data) { struct acpi_ged_event *event = data; @@ -142,7 +147,6 @@ static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares, #ifdef CONFIG_PM_SLEEP static void init_ged_handle(struct acpi_ged_device *geddev) { - struct acpi_ged_handle *wakeup_handle; acpi_handle gpo_handle = NULL; acpi_handle gpp_handle = NULL; acpi_status acpi_ret; @@ -151,10 +155,7 @@ static void init_ged_handle(struct acpi_ged_device *geddev) { if (!wakeup_handle) return; - geddev->wakeup_handle = wakeup_handle; - - /* Initialize wakeup_handle, prepare for ged suspend and resume */ - timer_setup(&wakeup_handle->timer, NULL, 0); + geddev->ged_handle = wakeup_handle; acpi_ret = acpi_get_handle(ACPI_HANDLE(geddev->dev), "_GPO", &gpo_handle); if (ACPI_FAILURE(acpi_ret)) @@ -204,8 +205,6 @@ static void ged_shutdown(struct platform_device *pdev) dev_dbg(geddev->dev, "GED releasing GSI %u @ IRQ %u\n", event->gsi, event->irq); } - if (geddev->wakeup_handle) - del_timer(&geddev->wakeup_handle->timer); } static int ged_remove(struct platform_device *pdev) @@ -220,23 +219,10 @@ static const struct acpi_device_id ged_acpi_ids[] = { }; #ifdef CONFIG_PM_SLEEP -static void ged_timer_callback(struct timer_list *t) -{ - struct acpi_ged_handle *wakeup_handle = from_timer(wakeup_handle, t, timer); - acpi_status acpi_ret; - - /* _GPP method enable power button */ - if (wakeup_handle && wakeup_handle->gpp_handle) { - acpi_ret = acpi_execute_simple_method(wakeup_handle->gpp_handle, NULL, ACPI_IRQ_MODEL_GIC); - if (ACPI_FAILURE(acpi_ret)) - pr_warn("_GPP method execution failed\n"); - } -} - static int ged_suspend(struct device *dev) { struct acpi_ged_device *geddev = dev_get_drvdata(dev); - struct acpi_ged_handle *wakeup_handle = geddev->wakeup_handle; + //struct acpi_ged_handle *wakeup_handle = geddev->wakeup_handle; struct acpi_ged_event *event, *next; acpi_status acpi_ret; @@ -255,18 +241,26 @@ static int ged_suspend(struct device *dev) return 0; } +static void gpp_enable_pwd(struct work_struct *private_) +{ + acpi_status acpi_ret; + + /* _GPP method enable power button */ + if (wakeup_handle && wakeup_handle->gpp_handle) { + acpi_ret = acpi_execute_simple_method(wakeup_handle->gpp_handle, NULL, ACPI_IRQ_MODEL_GIC); + if (ACPI_FAILURE(acpi_ret)) + pr_warn("_GPP method execution failed\n"); + } + +} + static int ged_resume(struct device *dev) { struct acpi_ged_device *geddev = dev_get_drvdata(dev); - struct acpi_ged_handle *wakeup_handle = geddev->wakeup_handle; struct acpi_ged_event *event, *next; - - /* use timer to complete 4s anti-shake */ - if (wakeup_handle && wakeup_handle->gpp_handle) { - wakeup_handle->timer.expires = jiffies + (4 * HZ); - wakeup_handle->timer.function = ged_timer_callback; - add_timer(&wakeup_handle->timer); - } + + /* use delayed_work to complete 4s anti-shake */ + schedule_delayed_work(&gpp_work, 4 * HZ); list_for_each_entry_safe(event, next, &geddev->event_list, node) disable_irq_wake(event->irq); -- 2.23.0.windows.1

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[PATCH 0/2] Add risc-v vhost-net support
by Yifei Jiang 26 Aug '20

26 Aug '20

euleros inclusion category: feature bugzilla: NA CVE: NA These two patches enable the support for vhost-net on RISC-V architecture. The following two steps are performed to run a vm with vhost-net: 1. create virbr0 on riscv64 emulation $ brctl addbr virbr0 $ brctl stp virbr0 on $ ifconfig virbr0 up $ ifconfig virbr0 virbr0_ip netmask 255.255.255.0 2. boot a riscv64 guest OS on riscv64 emulation $ ./qemu-system-riscv64 -M virt,accel=kvm -m 1024M -cpu host -nographic \ -name guest=riscv-guest \ -smp 2 \ -kernel ./Image \ -drive file=./guest.img,format=raw,id=hd0 \ -device virtio-blk,drive=hd0 \ -netdev type=tap,vhost=on,script=./ifup.sh,downscript=./ifdown.sh,id=net0 \ -append "root=/dev/vda rw console=ttyS0 earlycon=sbi" $ cat ifup.sh #!/bin/sh brctl addif virbr0 $1 ifconfig $1 up $ cat ifdown.sh #!/bin/sh ifconfig $1 down brctl delif virbr0 $1 This brenchmark netperf is used to test the performance of vhost-net and virtio-net. The results are as follow: $ ./netperf -H virbr0_ip -l 100 -t TCP_STREAM vhost-net: Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 100.06 521.62 virtio-net: Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 292.86 292.86 Link: https://gitee.com/openeuler/kernel/issues/I1SQJ2 Yifei Jiang (2): RISC-V: KVM: enable ioeventfd capability RISC-V: KVM: kernel mmio read/write support arch/riscv/kvm/Kconfig | 2 ++ arch/riscv/kvm/Makefile | 2 +- arch/riscv/kvm/vcpu_exit.c | 28 ++++++++++++++++++++++++++-- arch/riscv/kvm/vm.c | 1 + 4 files changed, 30 insertions(+), 3 deletions(-) -- 2.19.1

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[PATCH 1/4] can: j1939: fix support for multipacket broadcast message
by Yang Yingliang 25 Aug '20

25 Aug '20

From: Zhang Changzhong <zhangchangzhong(a)huawei.com> mainline inclusion from mainline-v5.9-rc2 commit f4fd77fd87e9b214c26bb2ebd4f90055eaea5ade category: bugfix bugzilla: 39990 CVE: NA --------------------------- Currently j1939_tp_im_involved_anydir() in j1939_tp_recv() check the previously set flags J1939_ECU_LOCAL_DST and J1939_ECU_LOCAL_SRC of incoming skb, thus multipacket broadcast message was aborted by receive side because it may come from remote ECUs and have no exact dst address. Similarly, j1939_tp_cmd_recv() and j1939_xtp_rx_dat() didn't process broadcast message. So fix it by checking and process broadcast message in j1939_tp_recv(), j1939_tp_cmd_recv() and j1939_xtp_rx_dat(). Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Zhang Changzhong <zhangchangzhong(a)huawei.com> Link: https://lore.kernel.org/r/1596599425-5534-2-git-send-email-zhangchangzhong@… Acked-by: Oleksij Rempel <o.rempel(a)pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl(a)pengutronix.de> Signed-off-by: Zhang Changzhong <zhangchangzhong(a)huawei.com> Reviewed-by: Yue Haibing <yuehaibing(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- net/can/j1939/transport.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c index 9f99af5b0b11e..e5188acbb1db7 100644 --- a/net/can/j1939/transport.c +++ b/net/can/j1939/transport.c @@ -1651,8 +1651,12 @@ static void j1939_xtp_rx_rts(struct j1939_priv *priv, struct sk_buff *skb, return; } session = j1939_xtp_rx_rts_session_new(priv, skb); - if (!session) + if (!session) { + if (cmd == J1939_TP_CMD_BAM && j1939_sk_recv_match(priv, skcb)) + netdev_info(priv->ndev, "%s: failed to create TP BAM session\n", + __func__); return; + } } else { if (j1939_xtp_rx_rts_session_active(session, skb)) { j1939_session_put(session); @@ -1829,6 +1833,13 @@ static void j1939_xtp_rx_dat(struct j1939_priv *priv, struct sk_buff *skb) else j1939_xtp_rx_dat_one(session, skb); } + + if (j1939_cb_is_broadcast(skcb)) { + session = j1939_session_get_by_addr(priv, &skcb->addr, false, + false); + if (session) + j1939_xtp_rx_dat_one(session, skb); + } } /* j1939 main intf */ @@ -1920,7 +1931,7 @@ static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb) if (j1939_tp_im_transmitter(skcb)) j1939_xtp_rx_rts(priv, skb, true); - if (j1939_tp_im_receiver(skcb)) + if (j1939_tp_im_receiver(skcb) || j1939_cb_is_broadcast(skcb)) j1939_xtp_rx_rts(priv, skb, false); break; @@ -1984,7 +1995,7 @@ int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb) { struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); - if (!j1939_tp_im_involved_anydir(skcb)) + if (!j1939_tp_im_involved_anydir(skcb) && !j1939_cb_is_broadcast(skcb)) return 0; switch (skcb->addr.pgn) { -- 2.25.1

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[RESEND,PATCH 0/7] Improvements and fixes
by Roberto Sassu 25 Aug '20

25 Aug '20

Resending due to conflicts with existing code. This patch set provides some improvements and fixes. The first three patches solve a permission problem caused by EVM. EVM denies xattr operations also for files that are not appraised by IMA. If only executables are appraised, xattr operations on the other files should be allowed, even if metadata verification fails (for example due to missing security.evm). At the moment, in openEuler we use EVM_ALLOW_METADATA_WRITES to avoid this problem (EVM does not check metadata integrity), but it would be useful to do the verification for example to prevent accidental changes on immutable metadata. The fourth patch enables the choice of the algorithm for the HMAC and ensures that the parameters passed to the functions which handle the HMAC are consistent with the algorithm chosen. The last three patches are simple bug fixes. Roberto Sassu (7): evm: Move hooks outside LSM infrastructure evm: Extend API of post hooks to pass the result of pre hooks evm: Return -EAGAIN to ignore verification failures evm: Propagate choice of HMAC algorithm in evm_crypto.c ima: Fix datalen check in ima_write_data() evm: Fix validation of fake xattr passed by IMA evm: Initialize saved_evm_status fs/attr.c | 7 ++- fs/xattr.c | 65 +++++++++++++++++--------- include/linux/evm.h | 18 +++++--- security/integrity/evm/Kconfig | 32 +++++++++++++ security/integrity/evm/evm.h | 1 + security/integrity/evm/evm_crypto.c | 15 ++++-- security/integrity/evm/evm_main.c | 71 +++++++++++++++++++++-------- security/integrity/ima/ima_fs.c | 2 +- security/integrity/integrity.h | 2 +- security/security.c | 18 ++------ 10 files changed, 159 insertions(+), 72 deletions(-) -- 2.27.GIT

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[PATCH 00/35] patches for iocost
by Yang Yingliang 25 Aug '20

25 Aug '20

patches 1-31 are from mainline patch 32 add cgroup-V1 support patch 33 and 34 are from ali-cloud-kernel(https://github.com/alibaba/cloud-kernel.git), they fix bug when introduce iocost in lower kernel. patch 35 fix a bug when using iocost in sq Dan Carpenter (1): iocost: don't nest spin_lock_irq in ioc_weight_write() Jiufei Xue (3): iocost: check active_list of all the ancestors in iocg_activate() iocost: fix NULL pointer dereference in ioc_rqos_throttle iocost: fix a deadlock in ioc_rqos_throttle() Stephen Rothwell (1): blkcg: blk-iocost: predeclare used structs Tejun Heo (27): blk-mq: add optional request->alloc_time_ns block/rq_qos: add rq_qos_merge() block/rq_qos: implement rq_qos_ops->queue_depth_changed() blkcg: separate blkcg_conf_get_disk() out of blkg_conf_prep() cgroup: add cgroup_parse_float() cgroup: Move cgroup_parse_float() implementation out of CONFIG_SYSFS blkcg: pass @q and @blkcg into blkcg_pol_alloc_pd_fn() blkcg: make ->cpd_init_fn() optional blkcg: implement blk-iocost blkcg: add tools/cgroup/iocost_monitor.py blkcg: add tools/cgroup/iocost_coef_gen.py blkcg: fix missing free on error path of blk_iocost_init() blkcg: add missing NULL check in ioc_cpd_alloc() blk-iocost: Fix incorrect operation order during iocg free blk-iocost: Account force-charged overage in absolute vtime blk-iocost: Don't let merges push vtime into the future iocost_monitor: Always use strings for json values iocost_monitor: Report more info with higher accuracy iocost_monitor: Report debt iocost: better trace vrate changes iocost: improve nr_lagging handling iocost: bump up default latency targets for hard disks iocost: over-budget forced IOs should schedule async delay iocost: Fix iocost_monitor.py due to helper type mismatch blk-iocost: fix incorrect vtime comparison in iocg_is_idle() blkcg: blkcg_activate_policy() should initialize ancestors first blkcg: Fix multiple bugs in blkcg_activate_policy() Waiman Long (1): blk-iocost: Fix error on iocost_ioc_vrate_adj Yu Kuai (2): iocost: add cgroup V1 suport blk-iocost: fix spin_lock won't release in sq Documentation/admin-guide/cgroup-v2.rst | 103 + block/Kconfig | 13 + block/Makefile | 1 + block/bfq-cgroup.c | 5 +- block/blk-cgroup.c | 136 +- block/blk-core.c | 4 + block/blk-iocost.c | 2547 +++++++++++++++++++++++ block/blk-iolatency.c | 5 +- block/blk-mq.c | 13 +- block/blk-rq-qos.c | 21 + block/blk-rq-qos.h | 5 + block/blk-settings.c | 2 +- block/blk-throttle.c | 6 +- block/blk-wbt.c | 18 +- block/blk-wbt.h | 4 - block/cfq-iosched.c | 5 +- include/linux/blk-cgroup.h | 4 +- include/linux/blk_types.h | 3 + include/linux/blkdev.h | 14 +- include/linux/cgroup.h | 2 + include/trace/events/iocost.h | 178 ++ kernel/cgroup/cgroup.c | 43 + tools/cgroup/iocost_coef_gen.py | 178 ++ tools/cgroup/iocost_monitor.py | 277 +++ 24 files changed, 3522 insertions(+), 65 deletions(-) create mode 100644 block/blk-iocost.c create mode 100644 include/trace/events/iocost.h create mode 100644 tools/cgroup/iocost_coef_gen.py create mode 100644 tools/cgroup/iocost_monitor.py -- 2.25.1

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[PATCH 0/5] Support idle-haltpoll in ARM
by Yang Yingliang 25 Aug '20

25 Aug '20

Idle-haltpoll has been supported in X86. Now, we will provide it in ARM. Xiangyou Xie (5): arm64: Optimize ttwu IPI cpuidle-haltpoll: Use arch_cpu_idle() to replace default_idle() arm64: Add some definitions of kvm_para* ARM: cpuidle: Add support for cpuidle-haltpoll driver for ARM config: set default value of haltpoll arch/arm64/Kconfig | 3 +++ arch/arm64/configs/euleros_defconfig | 2 ++ arch/arm64/configs/hulk_defconfig | 2 ++ arch/arm64/configs/openeuler_defconfig | 4 +++- arch/arm64/include/asm/kvm_para.h | 27 ++++++++++++++++++++++++++ arch/arm64/include/asm/thread_info.h | 3 +++ arch/arm64/kernel/process.c | 4 ++++ arch/x86/kernel/process.c | 1 + drivers/cpuidle/Kconfig | 4 ++-- drivers/cpuidle/cpuidle-haltpoll.c | 6 +++--- drivers/cpuidle/governors/haltpoll.c | 6 +++++- drivers/cpuidle/poll_state.c | 3 +++ 12 files changed, 58 insertions(+), 7 deletions(-) create mode 100644 arch/arm64/include/asm/kvm_para.h -- 2.25.1

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[PATCH 0/4] kvm: arm64: emulate ID registers
by Yang Yingliang 25 Aug '20

25 Aug '20

In AArch64, guest will read the same values of the ID regsiters with host. Both of them read the values from arm64_ftr_regs. This patch series add support to emulate and configure ID registers so that we can control the value of ID registers that guest read. Peng Liang (4): arm64: add a helper function to traverse arm64_ftr_regs kvm: arm64: emulate the ID registers kvm: arm64: make ID registers configurable kvm: arm64: add KVM_CAP_ARM_CPU_FEATURE extension arch/arm64/include/asm/cpufeature.h | 2 + arch/arm64/include/asm/kvm_host.h | 2 + arch/arm64/kernel/cpufeature.c | 13 ++++++ arch/arm64/kvm/sys_regs.c | 71 ++++++++++++++++++++++------- include/uapi/linux/kvm.h | 13 ++++++ virt/kvm/arm/arm.c | 23 ++++++++++ 6 files changed, 107 insertions(+), 17 deletions(-) -- 2.25.1

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[PATCH 01/22] arm64: mm: define NET_IP_ALIGN to 0
by Yang Yingliang 25 Aug '20

25 Aug '20

From: Ard Biesheuvel <ard.biesheuvel(a)linaro.org> mainline inclusion from mainline-v4.20-rc2 commit 26a4676faa1ad5d99317e0cd701e5d6f3e716b77 category: feature bugzilla: NA CVE: NA --------------------------- On arm64, there is no need to add 2 bytes of padding to the start of each network buffer just to make the IP header appear 32-bit aligned. Since this might actually adversely affect DMA performance some platforms, let's override NET_IP_ALIGN to 0 to get rid of this padding. Acked-by: Ilias Apalodimas <ilias.apalodimas(a)linaro.org> Tested-by: Ilias Apalodimas <ilias.apalodimas(a)linaro.org> Acked-by: Mark Rutland <mark.rutland(a)arm.com> Acked-by: Will Deacon <will.deacon(a)arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel(a)linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas(a)arm.com> Signed-off-by: Hanjun Guo <guohanjun(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> Reviewed-by: Xie XiuQi <xiexiuqi(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- arch/arm64/include/asm/processor.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h index 98529c8b5d313..7695a5117ff20 100644 --- a/arch/arm64/include/asm/processor.h +++ b/arch/arm64/include/asm/processor.h @@ -24,6 +24,14 @@ #define KERNEL_DS UL(-1) #define USER_DS (TASK_SIZE_64 - 1) +/* + * On arm64 systems, unaligned accesses by the CPU are cheap, and so there is + * no point in shifting all network buffers by 2 bytes just to make some IP + * header fields appear aligned in memory, potentially sacrificing some DMA + * performance on some platforms. + */ +#define NET_IP_ALIGN 0 + #ifndef __ASSEMBLY__ /* -- 2.25.1

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