September 2022 - Kernel - mailweb.openeuler.org

[PATCH openEuler-22.09] mm: reliable: Use EINVAL in reliable_check
by Zheng Zengkai 24 Sep '22

24 Sep '22

From: Ma Wupeng <mawupeng1(a)huawei.com> hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S CVE: NA -------------------------------- LTP's proc01 test was failing be because this ret code (1): proc01 1 TFAIL : proc01.c:400: read failed: /proc/self/task/1406366/reliable: errno=EPERM(1): Operation not permitted To slove this problem, replace EPERM with EINVAL in reliable_check(). Signed-off-by: Ma Wupeng <mawupeng1(a)huawei.com> Reviewed-by: Kefeng Wang <wangkefeng.wang(a)huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai(a)huawei.com> --- fs/proc/base.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index 8ae7c2be70c2..0c3a2eb61726 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1264,14 +1264,14 @@ static const struct file_operations proc_oom_score_adj_operations = { static inline int reliable_check(struct task_struct *task, struct pid *pid) { if (!mem_reliable_is_enabled()) - return -EPERM; + return -EINVAL; if (is_global_init(task)) - return -EPERM; + return -EINVAL; if (!task->mm || (task->flags & PF_KTHREAD) || (task->flags & PF_EXITING)) - return -EPERM; + return -EINVAL; return 0; } -- 2.20.1

1 0

[PATCH openEuler-22.09] Revert "net: af_key: add check for pfkey_broadcast in function pfkey_process"
by Zheng Zengkai 22 Sep '22

22 Sep '22

From: Michal Kubecek <mkubecek(a)suse.cz> stable inclusion from stable-v5.10.122 commit 7fa8312879f78d255a63b372473a7016d4c29d67 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6D4 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit 9c90c9b3e50e16d03c7f87d63e9db373974781e0 ] This reverts commit 4dc2a5a8f6754492180741facf2a8787f2c415d7. A non-zero return value from pfkey_broadcast() does not necessarily mean an error occurred as this function returns -ESRCH when no registered listener received the message. In particular, a call with BROADCAST_PROMISC_ONLY flag and null one_sk argument can never return zero so that this commit in fact prevents processing any PF_KEY message. One visible effect is that racoon daemon fails to find encryption algorithms like aes and refuses to start. Excluding -ESRCH return value would fix this but it's not obvious that we really want to bail out here and most other callers of pfkey_broadcast() also ignore the return value. Also, as pointed out by Steffen Klassert, PF_KEY is kind of deprecated and newer userspace code should use netlink instead so that we should only disturb the code for really important fixes. v2: add a comment explaining why is the return value ignored Signed-off-by: Michal Kubecek <mkubecek(a)suse.cz> Signed-off-by: Steffen Klassert <steffen.klassert(a)secunet.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Reviewed-by: Yue Haibing <yuehaibing(a)huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai(a)huawei.com> --- net/key/af_key.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/net/key/af_key.c b/net/key/af_key.c index dca264844be4..aa3b1e0cd311 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -2833,10 +2833,12 @@ static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb void *ext_hdrs[SADB_EXT_MAX]; int err; - err = pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, - BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); - if (err) - return err; + /* Non-zero return value of pfkey_broadcast() does not always signal + * an error and even on an actual error we may still want to process + * the message so rather ignore the return value. + */ + pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, + BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); memset(ext_hdrs, 0, sizeof(ext_hdrs)); err = parse_exthdrs(skb, hdr, ext_hdrs); -- 2.20.1

1 0

[PATCH 1/2] net: hns3: fix error resume keep alive when remove hclgevf
by Laibin Qiu 22 Sep '22

22 Sep '22

From: Yonglong Liu <liuyonglong(a)huawei.com> driver inclusion category: https://gitee.com/openeuler/kernel/issues/I5S7WZ bugzilla: NA CVE: NA ---------------------------- When enable lots of vf, remove the driver of vf will call keep alive wrong resume. Fixes: 6a804d0a6068 ("net: hns3: fix keep alive can not resume problem when system busy") Signed-off-by: Yonglong Liu <liuyonglong(a)huawei.com> Reviewed-by: li yongxin <liyongxin1(a)huawei.com> Signed-off-by: Laibin Qiu <qiulaibin(a)huawei.com> --- drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 2 ++ drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h | 1 + drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c | 3 ++- 3 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c index 41a12df725b3..b4b1e440fba4 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c @@ -7096,6 +7096,7 @@ int hclge_vport_start(struct hclge_vport *vport) struct hclge_dev *hdev = vport->back; vport->last_active_jiffies = jiffies; + set_bit(HCLGE_VPORT_STATE_START, &vport->state); set_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state); if (test_bit(vport->vport_id, hdev->vport_config_block)) { @@ -7113,6 +7114,7 @@ int hclge_vport_start(struct hclge_vport *vport) void hclge_vport_stop(struct hclge_vport *vport) { + clear_bit(HCLGE_VPORT_STATE_START, &vport->state); clear_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state); } diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h index 8477dc343a40..99a55fa74cd4 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h @@ -926,6 +926,7 @@ enum HCLGE_VPORT_STATE { HCLGE_VPORT_STATE_MAC_TBL_CHANGE, HCLGE_VPORT_STATE_PROMISC_CHANGE, HCLGE_VPORT_STATE_VLAN_FLTR_CHANGE, + HCLGE_VPORT_STATE_START, HCLGE_VPORT_STATE_MAX }; diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c index 45f94cd33524..893f6e0ce473 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c @@ -644,7 +644,8 @@ static void hclge_vf_keep_alive(struct hclge_vport *vport) vport->last_active_jiffies = jiffies; - if (!test_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state)) { + if (test_bit(HCLGE_VPORT_STATE_START, &vport->state) && + !test_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state)) { set_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state); dev_info(&hdev->pdev->dev, "VF %u keep alive resume!", -- 2.25.1

1 1

[PATCH 1/2] net: hns3: fix keep alive can not resume problem when system busy
by Laibin Qiu 22 Sep '22

22 Sep '22

From: Yonglong Liu <liuyonglong(a)huawei.com> driver inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5S7WZ CVE: NA ---------------------------- Currently, VF send keep alive to PF every 2s, and PF detect the keep alive for 8s, some case, the work queue may schedule late, cause keep alive lost, then the mac setting from PF may not affect to the VF, and the keep alive can not resume, only reset VF or reload VF driver can resume. This patch adds keep alive resume mechanism, and adds some debug print for this case. When link status change between keep alive lost and resume, the link status of VF may not the same as the PF, so adds push link status to VF to avoid this case. Signed-off-by: Yonglong Liu <liuyonglong(a)huawei.com> Reviewed-by: li yongxin <liyongxin1(a)huawei.com> Signed-off-by: Laibin Qiu <qiulaibin(a)huawei.com> --- .../hisilicon/hns3/hns3pf/hclge_main.c | 9 ++++++-- .../hisilicon/hns3/hns3pf/hclge_mbx.c | 22 +++++++++++++++++++ 2 files changed, 29 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c index 7e5e58470017..41a12df725b3 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c @@ -4046,7 +4046,12 @@ static void hclge_update_vport_alive(struct hclge_dev *hdev) * receive a vf's alive msg for 8s, regards the vf is offline */ if (time_after(jiffies, vport->last_active_jiffies + 8 * HZ)) - clear_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state); + if (test_and_clear_bit(HCLGE_VPORT_STATE_ALIVE, + &vport->state)) + dev_info(&hdev->pdev->dev, + "VF %u keep alive lost!", + vport->vport_id - + HCLGE_VF_VPORT_START_NUM); /* If vf is not alive, set to default value */ if (!test_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state)) @@ -7090,8 +7095,8 @@ int hclge_vport_start(struct hclge_vport *vport) { struct hclge_dev *hdev = vport->back; - set_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state); vport->last_active_jiffies = jiffies; + set_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state); if (test_bit(vport->vport_id, hdev->vport_config_block)) { if (vport->vport_id) { diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c index b1b59c1f5cc6..45f94cd33524 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c @@ -639,7 +639,29 @@ static int hclge_reset_vf(struct hclge_vport *vport) static void hclge_vf_keep_alive(struct hclge_vport *vport) { + struct hclge_dev *hdev = vport->back; + int ret; + vport->last_active_jiffies = jiffies; + + if (!test_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state)) { + set_bit(HCLGE_VPORT_STATE_ALIVE, &vport->state); + + dev_info(&hdev->pdev->dev, "VF %u keep alive resume!", + vport->vport_id - HCLGE_VF_VPORT_START_NUM); + + /* if vf support push link, need to push link status after keep + * alive restore, because the vf will not fetch the link status + * of it's own. + */ + ret = hclge_push_vf_link_status(vport); + if (ret) { + dev_err(&hdev->pdev->dev, + "failed to push link status to vf%u, ret=%d\n", + vport->vport_id - HCLGE_VF_VPORT_START_NUM, + ret); + } + } } static int hclge_set_vf_mtu(struct hclge_vport *vport, -- 2.25.1

1 1

[PATCH openEuler-5.10 01/16] blk-mq: fix io hung due to missing commit_rqs
by Zheng Zengkai 21 Sep '22

21 Sep '22

From: Yu Kuai <yukuai3(a)huawei.com> hulk inclusion category: bugfix bugzilla: 186851, https://gitee.com/openeuler/kernel/issues/I5L01G CVE: NA -------------------------------- Currently, in virtio_scsi, if 'bd->last' is not set to true while dispatching request, such io will stay in driver's queue, and driver will wait for block layer to dispatch more rqs. However, if block layer failed to dispatch more rq, it should trigger commit_rqs to inform driver. There is a problem in blk_mq_try_issue_list_directly() that commit_rqs won't be called: // assume that queue_depth is set to 1, list contains two rq blk_mq_try_issue_list_directly blk_mq_request_issue_directly // dispatch first rq // last is false __blk_mq_try_issue_directly blk_mq_get_dispatch_budget // succeed to get first budget __blk_mq_issue_directly scsi_queue_rq cmd->flags |= SCMD_LAST virtscsi_queuecommand kick = (sc->flags & SCMD_LAST) != 0 // kick is false, first rq won't issue to disk queued++ blk_mq_request_issue_directly // dispatch second rq __blk_mq_try_issue_directly blk_mq_get_dispatch_budget // failed to get second budget ret == BLK_STS_RESOURCE blk_mq_request_bypass_insert // errors is still 0 if (!list_empty(list) || errors && ...) // won't pass, commit_rqs won't be called In this situation, first rq relied on second rq to dispatch, while second rq relied on first rq to complete, thus they will both hung. Fix the problem by also treat 'BLK_STS_*RESOURCE' as 'errors' since it means that request is not queued successfully. Same problem exists in blk_mq_dispatch_rq_list(), 'BLK_STS_*RESOURCE' can't be treated as 'errors' here, fix the problem by calling commit_rqs if queue_rq return 'BLK_STS_*RESOURCE'. Fixes: d666ba98f849 ("blk-mq: add mq_ops->commit_rqs()") Signed-off-by: Yu Kuai <yukuai3(a)huawei.com> Link: https://lore.kernel.org/all/20220726122224.1790882-1-yukuai1@huaweicloud.co… Reviewed-by: Ming Lei <ming.lei(a)redhat.com> Reviewed-by: Jason Yan <yanaijie(a)huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai(a)huawei.com> --- block/blk-mq.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 1941ffc4db85..b9827b3d3f63 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1484,7 +1484,8 @@ bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *hctx, struct list_head *list, /* If we didn't flush the entire list, we could have told the driver * there was more coming, but that turned out to be a lie. */ - if ((!list_empty(list) || errors) && q->mq_ops->commit_rqs && queued) + if ((!list_empty(list) || errors || needs_resource || + ret == BLK_STS_DEV_RESOURCE) && q->mq_ops->commit_rqs && queued) q->mq_ops->commit_rqs(hctx); /* * Any items that need requeuing? Stuff them into hctx->dispatch, @@ -2224,6 +2225,7 @@ void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx, list_del_init(&rq->queuelist); ret = blk_mq_request_issue_directly(rq, list_empty(list)); if (ret != BLK_STS_OK) { + errors++; if (ret == BLK_STS_RESOURCE || ret == BLK_STS_DEV_RESOURCE) { blk_mq_request_bypass_insert(rq, false, @@ -2231,7 +2233,6 @@ void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx, break; } blk_mq_end_request(rq, ret); - errors++; } else queued++; } -- 2.20.1

1 15

[PATCH openEuler-22.09 v2] bpf:programmable: Fix build error of 'stack exceeds 512 bytes'
by Zheng Zengkai 21 Sep '22

21 Sep '22

From: Hui Tang <tanghui20(a)huawei.com> hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5RMFU CVE: NA -------------------------------- 1.Change arg type of 'bpf_get_cpumask_info' to avoid bpf program stack exceeds 512 bytes. 2.Fix back-edge error in sample 'sched_select_core' 3.Fix loop too complex in sample 'sached_select_core' Changes in v2: Move cpu initialization out of the for loop. Fixes: 1bf0417b95a9 ("sched: programmable: Add helper function for cpu topo...") Fixes: 2c1189e32bf9 ("samples:bpf: Add samples for cfs select core") Signed-off-by: Hui Tang <tanghui20(a)huawei.com> --- include/uapi/linux/bpf.h | 2 +- kernel/sched/bpf_topology.c | 9 ++- samples/bpf/sched_select_core_kern.c | 32 ++++++++--- tools/include/uapi/linux/bpf.h | 2 +- tools/lib/bpf/libbpf_sched.h | 86 +++++++++++++++++++++------- 5 files changed, 96 insertions(+), 35 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index db585d960d64..7e474c6fc4a7 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -3903,7 +3903,7 @@ union bpf_attr { * Return * 0 on success, or a negative error in case of failure. * - * int bpf_get_cpumask_info(struct bpf_cpumask_info *cpus, int len) + * int bpf_get_cpumask_info(struct bpf_map *map, struct bpf_cpumask_info *cpus) * Description * Get system cpus returned in *cpus*. * Return diff --git a/kernel/sched/bpf_topology.c b/kernel/sched/bpf_topology.c index 9c2eda139e2a..843b6092a64f 100644 --- a/kernel/sched/bpf_topology.c +++ b/kernel/sched/bpf_topology.c @@ -70,10 +70,9 @@ const struct bpf_func_proto bpf_init_cpu_topology_proto = { .arg2_type = ARG_ANYTHING, }; -BPF_CALL_2(bpf_get_cpumask_info, struct bpf_cpumask_info *, cpus, - int, len) +BPF_CALL_2(bpf_get_cpumask_info, struct bpf_map *, map, struct bpf_cpumask_info *, cpus) { - if (len != sizeof(*cpus)) + if (!cpus) return -EINVAL; cpumask_copy(&cpus->cpu_possible_cpumask, cpu_possible_mask); @@ -92,6 +91,6 @@ const struct bpf_func_proto bpf_get_cpumask_info_proto = { .func = bpf_get_cpumask_info, .gpl_only = false, .ret_type = RET_INTEGER, - .arg1_type = ARG_PTR_TO_UNINIT_MEM, - .arg2_type = ARG_CONST_SIZE, + .arg1_type = ARG_CONST_MAP_PTR, + .arg2_type = ARG_PTR_TO_MAP_VALUE_OR_NULL, }; diff --git a/samples/bpf/sched_select_core_kern.c b/samples/bpf/sched_select_core_kern.c index 18617e89b395..30765ae65f85 100644 --- a/samples/bpf/sched_select_core_kern.c +++ b/samples/bpf/sched_select_core_kern.c @@ -62,7 +62,7 @@ struct tag_info { struct tag_info tag_tbl[] = { {TAG_NONE, ""}, - {TAG_ID(1), "0-3"}, + {TAG_ID(1), "0-1"}, {TAG_ID(2), "4-7"}, {TAG_MAX, ""}, }; @@ -94,13 +94,17 @@ static struct cpumask *select_better_cpus(struct task_struct *p, long min_util = INT_MIN; struct task_group *tg; long spare; - int cpu; + int cpu, i; if (!prefer_cpus_valid(prefer_cpus, (void *)getVal(p->cpus_ptr))) return (void *)getVal(p->cpus_ptr); tg = p->sched_task_group; - libbpf_for_each_cpu(cpu, prefer_cpus) { + for (i = 0, cpu = -1; i < BPF_SCHED_LOOP_MAX; i++) { + cpu = libbpf_cpumask_next(cpu, (void *)getVal(prefer_cpus)); + if (cpu >= libbpf_nr_cpus_ids()) + break; + if (idlest_cpu && libbpf_available_idle_cpu(cpu)) { *idlest_cpu = cpu; } else if (idlest_cpu) { @@ -159,9 +163,14 @@ int BPF_PROG(cfs_select_cpu_range, struct sched_migrate_ctx *h_ctx) SEC("sched/cfs_select_rq_exit") int BPF_PROG(cfs_select_cpu_range_exit, struct sched_migrate_ctx *h_ctx) { + struct task_struct *p = getVal(h_ctx->task); + long tag = getVal(p->tag); int *idlest_cpu; int key = 0; + if (tag <= TAG_NONE || tag >= TAG_MAX) + return SELECT_RQ_EXIT_CPU_VALID; + idlest_cpu = bpf_map_lookup_elem(&map_idlest_cpu, &key); if (!idlest_cpu) { libbpf_sched_set_task_cpus_ptr(h_ctx, (void *)getVal(h_ctx->cpus_allowed)); @@ -186,7 +195,7 @@ static int find_idlest_cpu(struct task_struct *p, int parent) int cpu; int i; - for (i = 0, cpu = -1; i < NR_CPUS; i++) { + for (i = 0, cpu = -1; i < BPF_SCHED_LOOP_MAX; i++) { cpu = libbpf_cpumask_next(cpu, (void *)getVal(p->cpus_ptr)); if (cpu >= libbpf_nr_cpus_ids()) break; @@ -203,17 +212,26 @@ static int find_idlest_cpu(struct task_struct *p, int parent) static int select_idle_cpu(struct task_struct *p, int parent, int prev_cpu) { - int cpu; + int cpu, i; if (libbpf_available_idle_cpu(prev_cpu)) return prev_cpu; if (libbpf_available_idle_cpu(parent)) - return prev_cpu; + return parent; + + cpu = libbpf_cpumask_next_wrap(prev_cpu - 1, + (void *)getVal(p->cpus_ptr), + prev_cpu, false); + for (i = 0; i < BPF_SCHED_LOOP_MAX; i++) { + if (cpu >= libbpf_nr_cpumask_bits()) + break; - libbpf_for_each_cpu_wrap(cpu, (void *)getVal(p->cpus_ptr), prev_cpu) { if (libbpf_available_idle_cpu(cpu)) return cpu; + + cpu = libbpf_cpumask_next_wrap(cpu, (void *)getVal(p->cpus_ptr), + prev_cpu, true); } return prev_cpu; diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 57b927e99092..22f7880a0bb6 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -4613,7 +4613,7 @@ union bpf_attr { * Return * 0 on success, or a negative error in case of failure. * - * int bpf_get_cpumask_info(struct bpf_cpumask_info *cpus, int len) + * int bpf_get_cpumask_info(struct bpf_map *map, struct bpf_cpumask_info *cpus) * Description * Get system cpus returned in *cpus*. * Return diff --git a/tools/lib/bpf/libbpf_sched.h b/tools/lib/bpf/libbpf_sched.h index 6cb30e8e81f8..187e854b99b3 100644 --- a/tools/lib/bpf/libbpf_sched.h +++ b/tools/lib/bpf/libbpf_sched.h @@ -21,6 +21,8 @@ #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> +/* set bigger value may lead verifier failed */ +#define BPF_SCHED_LOOP_MAX 1024 #define INVALID_PTR ((void *)(0UL)) #define getVal(P) \ ({ \ @@ -69,6 +71,13 @@ static __always_inline int libbpf_nr_cpumask_bits(void); #endif +struct { + __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); + __type(key, u32); + __type(value, struct bpf_cpumask_info); + __uint(max_entries, 1); +} map_cpumask_info SEC(".maps"); + static __always_inline long libbpf_cpumask_copy(struct cpumask *dst, struct cpumask *src) { @@ -228,58 +237,93 @@ static __always_inline long libbpf_cpumask_cpulist_parse(char *src1, static __always_inline int libbpf_num_active_cpus(void) { - struct bpf_cpumask_info cpus; + struct bpf_cpumask_info *cpus; + int key = 0; + + cpus = bpf_map_lookup_elem(&map_cpumask_info, &key); + if (!cpus) + return -1; - bpf_get_cpumask_info(&cpus, sizeof(cpus)); - return getVal(cpus.nums_active_cpus); + bpf_get_cpumask_info(&map_cpumask_info, cpus); + return getVal(cpus->nums_active_cpus); } static __always_inline int libbpf_num_possible_cpus(void) { - struct bpf_cpumask_info cpus; + struct bpf_cpumask_info *cpus; + int key = 0; - bpf_get_cpumask_info(&cpus, sizeof(cpus)); - return getVal(cpus.nums_possible_cpus); + cpus = bpf_map_lookup_elem(&map_cpumask_info, &key); + if (!cpus) + return -1; + + bpf_get_cpumask_info(&map_cpumask_info, cpus); + return getVal(cpus->nums_possible_cpus); } static __always_inline void libbpf_possible_cpus_mask(struct cpumask *mask) { - struct bpf_cpumask_info cpus; + struct bpf_cpumask_info *cpus; + int key = 0; + + cpus = bpf_map_lookup_elem(&map_cpumask_info, &key); + if (!cpus) + return; - bpf_get_cpumask_info(&cpus, sizeof(cpus)); - libbpf_cpumask_copy(mask, &cpus.cpu_possible_cpumask); + bpf_get_cpumask_info(&map_cpumask_info, cpus); + libbpf_cpumask_copy(mask, &cpus->cpu_possible_cpumask); } static __always_inline void libbpf_active_cpus_mask(struct cpumask *mask) { - struct bpf_cpumask_info cpus; + struct bpf_cpumask_info *cpus; + int key = 0; - bpf_get_cpumask_info(&cpus, sizeof(cpus)); - libbpf_cpumask_copy(mask, &cpus.cpu_active_cpumask); + cpus = bpf_map_lookup_elem(&map_cpumask_info, &key); + if (!cpus) + return; + + bpf_get_cpumask_info(&map_cpumask_info, cpus); + libbpf_cpumask_copy(mask, &cpus->cpu_active_cpumask); } static __always_inline void libbpf_isolate_cpus_mask(struct cpumask *mask) { - struct bpf_cpumask_info cpus; + struct bpf_cpumask_info *cpus; + int key = 0; + + cpus = bpf_map_lookup_elem(&map_cpumask_info, &key); + if (!cpus) + return; - bpf_get_cpumask_info(&cpus, sizeof(cpus)); - libbpf_cpumask_copy(mask, &cpus.cpu_isolate_cpumask); + bpf_get_cpumask_info(&map_cpumask_info, cpus); + libbpf_cpumask_copy(mask, &cpus->cpu_isolate_cpumask); } static __always_inline int libbpf_nr_cpus_ids(void) { - struct bpf_cpumask_info cpus; + struct bpf_cpumask_info *cpus; + int key = 0; - bpf_get_cpumask_info(&cpus, sizeof(cpus)); - return getVal(cpus.nr_cpu_ids); + cpus = bpf_map_lookup_elem(&map_cpumask_info, &key); + if (!cpus) + return -1; + + bpf_get_cpumask_info(&map_cpumask_info, cpus); + return getVal(cpus->nr_cpu_ids); } static __always_inline int libbpf_nr_cpumask_bits(void) { - struct bpf_cpumask_info cpus; + struct bpf_cpumask_info *cpus; + int key = 0; + + cpus = bpf_map_lookup_elem(&map_cpumask_info, &key); + if (!cpus) + return -1; - bpf_get_cpumask_info(&cpus, sizeof(cpus)); - return getVal(cpus.bpf_nr_cpumask_bits); + bpf_get_cpumask_info(&map_cpumask_info, cpus); + return getVal(cpus->bpf_nr_cpumask_bits); } static __always_inline unsigned long libbpf_cfs_load_avg_of(int cpu) -- 2.20.1

1 0

[PATCH openEuler-5.10-LTS 01/18] x86/speculation: Add RSB VM Exit protections
by Zheng Zengkai 20 Sep '22

20 Sep '22

From: Daniel Sneddon <daniel.sneddon(a)linux.intel.com> stable inclusion from stable-v5.10.136 commit 509c2c9fe75ea7493eebbb6bb2f711f37530ae19 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5N1SO CVE: CVE-2022-26373 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- commit 2b1299322016731d56807aa49254a5ea3080b6b3 upstream. tl;dr: The Enhanced IBRS mitigation for Spectre v2 does not work as documented for RET instructions after VM exits. Mitigate it with a new one-entry RSB stuffing mechanism and a new LFENCE. == Background == Indirect Branch Restricted Speculation (IBRS) was designed to help mitigate Branch Target Injection and Speculative Store Bypass, i.e. Spectre, attacks. IBRS prevents software run in less privileged modes from affecting branch prediction in more privileged modes. IBRS requires the MSR to be written on every privilege level change. To overcome some of the performance issues of IBRS, Enhanced IBRS was introduced. eIBRS is an "always on" IBRS, in other words, just turn it on once instead of writing the MSR on every privilege level change. When eIBRS is enabled, more privileged modes should be protected from less privileged modes, including protecting VMMs from guests. == Problem == Here's a simplification of how guests are run on Linux' KVM: void run_kvm_guest(void) { // Prepare to run guest VMRESUME(); // Clean up after guest runs } The execution flow for that would look something like this to the processor: 1. Host-side: call run_kvm_guest() 2. Host-side: VMRESUME 3. Guest runs, does "CALL guest_function" 4. VM exit, host runs again 5. Host might make some "cleanup" function calls 6. Host-side: RET from run_kvm_guest() Now, when back on the host, there are a couple of possible scenarios of post-guest activity the host needs to do before executing host code: * on pre-eIBRS hardware (legacy IBRS, or nothing at all), the RSB is not touched and Linux has to do a 32-entry stuffing. * on eIBRS hardware, VM exit with IBRS enabled, or restoring the host IBRS=1 shortly after VM exit, has a documented side effect of flushing the RSB except in this PBRSB situation where the software needs to stuff the last RSB entry "by hand". IOW, with eIBRS supported, host RET instructions should no longer be influenced by guest behavior after the host retires a single CALL instruction. However, if the RET instructions are "unbalanced" with CALLs after a VM exit as is the RET in #6, it might speculatively use the address for the instruction after the CALL in #3 as an RSB prediction. This is a problem since the (untrusted) guest controls this address. Balanced CALL/RET instruction pairs such as in step #5 are not affected. == Solution == The PBRSB issue affects a wide variety of Intel processors which support eIBRS. But not all of them need mitigation. Today, X86_FEATURE_RSB_VMEXIT triggers an RSB filling sequence that mitigates PBRSB. Systems setting RSB_VMEXIT need no further mitigation - i.e., eIBRS systems which enable legacy IBRS explicitly. However, such systems (X86_FEATURE_IBRS_ENHANCED) do not set RSB_VMEXIT and most of them need a new mitigation. Therefore, introduce a new feature flag X86_FEATURE_RSB_VMEXIT_LITE which triggers a lighter-weight PBRSB mitigation versus RSB_VMEXIT. The lighter-weight mitigation performs a CALL instruction which is immediately followed by a speculative execution barrier (INT3). This steers speculative execution to the barrier -- just like a retpoline -- which ensures that speculation can never reach an unbalanced RET. Then, ensure this CALL is retired before continuing execution with an LFENCE. In other words, the window of exposure is opened at VM exit where RET behavior is troublesome. While the window is open, force RSB predictions sampling for RET targets to a dead end at the INT3. Close the window with the LFENCE. There is a subset of eIBRS systems which are not vulnerable to PBRSB. Add these systems to the cpu_vuln_whitelist[] as NO_EIBRS_PBRSB. Future systems that aren't vulnerable will set ARCH_CAP_PBRSB_NO. [ bp: Massage, incorporate review comments from Andy Cooper. ] Signed-off-by: Daniel Sneddon <daniel.sneddon(a)linux.intel.com> Co-developed-by: Pawan Gupta <pawan.kumar.gupta(a)linux.intel.com> Signed-off-by: Pawan Gupta <pawan.kumar.gupta(a)linux.intel.com> Signed-off-by: Borislav Petkov <bp(a)suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> conflict: arch/x86/include/asm/cpufeatures.h Signed-off-by: Chen Jiahao <chenjiahao16(a)huawei.com> Reviewed-by: Zhang Jianhua <chris.zjh(a)huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai(a)huawei.com> --- Documentation/admin-guide/hw-vuln/spectre.rst | 8 ++ arch/x86/include/asm/cpufeatures.h | 2 + arch/x86/include/asm/msr-index.h | 4 + arch/x86/include/asm/nospec-branch.h | 17 +++- arch/x86/kernel/cpu/bugs.c | 86 ++++++++++++++----- arch/x86/kernel/cpu/common.c | 12 ++- arch/x86/kvm/vmx/vmenter.S | 8 +- tools/arch/x86/include/asm/cpufeatures.h | 1 + tools/arch/x86/include/asm/msr-index.h | 4 + 9 files changed, 113 insertions(+), 29 deletions(-) diff --git a/Documentation/admin-guide/hw-vuln/spectre.rst b/Documentation/admin-guide/hw-vuln/spectre.rst index 6bd97cd50d62..7e061ed449aa 100644 --- a/Documentation/admin-guide/hw-vuln/spectre.rst +++ b/Documentation/admin-guide/hw-vuln/spectre.rst @@ -422,6 +422,14 @@ The possible values in this file are: 'RSB filling' Protection of RSB on context switch enabled ============= =========================================== + - EIBRS Post-barrier Return Stack Buffer (PBRSB) protection status: + + =========================== ======================================================= + 'PBRSB-eIBRS: SW sequence' CPU is affected and protection of RSB on VMEXIT enabled + 'PBRSB-eIBRS: Vulnerable' CPU is vulnerable + 'PBRSB-eIBRS: Not affected' CPU is not affected by PBRSB + =========================== ======================================================= + Full mitigation might require a microcode update from the CPU vendor. When the necessary microcode is not available, the kernel will report vulnerability. diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index bf531e883e82..b5852d41d9b9 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -297,6 +297,7 @@ #define X86_FEATURE_RETPOLINE_LFENCE (11*32+13) /* "" Use LFENCE for Spectre variant 2 */ #define X86_FEATURE_RETHUNK (11*32+14) /* "" Use REturn THUNK */ #define X86_FEATURE_UNRET (11*32+15) /* "" AMD BTB untrain return */ +#define X86_FEATURE_RSB_VMEXIT_LITE (11*32+17) /* "" Fill RSB on VM exit when EIBRS is enabled */ /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */ #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */ @@ -428,5 +429,6 @@ #define X86_BUG_SRBDS X86_BUG(24) /* CPU may leak RNG bits if not mitigated */ #define X86_BUG_MMIO_STALE_DATA X86_BUG(25) /* CPU is affected by Processor MMIO Stale Data vulnerabilities */ #define X86_BUG_RETBLEED X86_BUG(26) /* CPU is affected by RETBleed */ +#define X86_BUG_EIBRS_PBRSB X86_BUG(27) /* EIBRS is vulnerable to Post Barrier RSB Predictions */ #endif /* _ASM_X86_CPUFEATURES_H */ diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index ffc09df04d41..d9c352e76850 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -148,6 +148,10 @@ * are restricted to targets in * kernel. */ +#define ARCH_CAP_PBRSB_NO BIT(24) /* + * Not susceptible to Post-Barrier + * Return Stack Buffer Predictions. + */ #define MSR_IA32_FLUSH_CMD 0x0000010b #define L1D_FLUSH BIT(0) /* diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h index 32e25cac72b2..3c615488b740 100644 --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -118,13 +118,28 @@ #endif .endm +.macro ISSUE_UNBALANCED_RET_GUARD + ANNOTATE_INTRA_FUNCTION_CALL + call .Lunbalanced_ret_guard_\@ + int3 +.Lunbalanced_ret_guard_\@: + add $(BITS_PER_LONG/8), %_ASM_SP + lfence +.endm + /* * A simpler FILL_RETURN_BUFFER macro. Don't make people use the CPP * monstrosity above, manually. */ -.macro FILL_RETURN_BUFFER reg:req nr:req ftr:req +.macro FILL_RETURN_BUFFER reg:req nr:req ftr:req ftr2 +.ifb \ftr2 ALTERNATIVE "jmp .Lskip_rsb_\@", "", \ftr +.else + ALTERNATIVE_2 "jmp .Lskip_rsb_\@", "", \ftr, "jmp .Lunbalanced_\@", \ftr2 +.endif __FILL_RETURN_BUFFER(\reg,\nr,%_ASM_SP) +.Lunbalanced_\@: + ISSUE_UNBALANCED_RET_GUARD .Lskip_rsb_\@: .endm diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index bc6382f5ec27..d4cb9ff639aa 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1290,6 +1290,53 @@ static void __init spec_ctrl_disable_kernel_rrsba(void) } } +static void __init spectre_v2_determine_rsb_fill_type_at_vmexit(enum spectre_v2_mitigation mode) +{ + /* + * Similar to context switches, there are two types of RSB attacks + * after VM exit: + * + * 1) RSB underflow + * + * 2) Poisoned RSB entry + * + * When retpoline is enabled, both are mitigated by filling/clearing + * the RSB. + * + * When IBRS is enabled, while #1 would be mitigated by the IBRS branch + * prediction isolation protections, RSB still needs to be cleared + * because of #2. Note that SMEP provides no protection here, unlike + * user-space-poisoned RSB entries. + * + * eIBRS should protect against RSB poisoning, but if the EIBRS_PBRSB + * bug is present then a LITE version of RSB protection is required, + * just a single call needs to retire before a RET is executed. + */ + switch (mode) { + case SPECTRE_V2_NONE: + return; + + case SPECTRE_V2_EIBRS_LFENCE: + case SPECTRE_V2_EIBRS: + if (boot_cpu_has_bug(X86_BUG_EIBRS_PBRSB)) { + setup_force_cpu_cap(X86_FEATURE_RSB_VMEXIT_LITE); + pr_info("Spectre v2 / PBRSB-eIBRS: Retire a single CALL on VMEXIT\n"); + } + return; + + case SPECTRE_V2_EIBRS_RETPOLINE: + case SPECTRE_V2_RETPOLINE: + case SPECTRE_V2_LFENCE: + case SPECTRE_V2_IBRS: + setup_force_cpu_cap(X86_FEATURE_RSB_VMEXIT); + pr_info("Spectre v2 / SpectreRSB : Filling RSB on VMEXIT\n"); + return; + } + + pr_warn_once("Unknown Spectre v2 mode, disabling RSB mitigation at VM exit"); + dump_stack(); +} + static void __init spectre_v2_select_mitigation(void) { enum spectre_v2_mitigation_cmd cmd = spectre_v2_parse_cmdline(); @@ -1438,28 +1485,7 @@ static void __init spectre_v2_select_mitigation(void) setup_force_cpu_cap(X86_FEATURE_RSB_CTXSW); pr_info("Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch\n"); - /* - * Similar to context switches, there are two types of RSB attacks - * after vmexit: - * - * 1) RSB underflow - * - * 2) Poisoned RSB entry - * - * When retpoline is enabled, both are mitigated by filling/clearing - * the RSB. - * - * When IBRS is enabled, while #1 would be mitigated by the IBRS branch - * prediction isolation protections, RSB still needs to be cleared - * because of #2. Note that SMEP provides no protection here, unlike - * user-space-poisoned RSB entries. - * - * eIBRS, on the other hand, has RSB-poisoning protections, so it - * doesn't need RSB clearing after vmexit. - */ - if (boot_cpu_has(X86_FEATURE_RETPOLINE) || - boot_cpu_has(X86_FEATURE_KERNEL_IBRS)) - setup_force_cpu_cap(X86_FEATURE_RSB_VMEXIT); + spectre_v2_determine_rsb_fill_type_at_vmexit(mode); /* * Retpoline protects the kernel, but doesn't protect firmware. IBRS @@ -2202,6 +2228,19 @@ static char *ibpb_state(void) return ""; } +static char *pbrsb_eibrs_state(void) +{ + if (boot_cpu_has_bug(X86_BUG_EIBRS_PBRSB)) { + if (boot_cpu_has(X86_FEATURE_RSB_VMEXIT_LITE) || + boot_cpu_has(X86_FEATURE_RSB_VMEXIT)) + return ", PBRSB-eIBRS: SW sequence"; + else + return ", PBRSB-eIBRS: Vulnerable"; + } else { + return ", PBRSB-eIBRS: Not affected"; + } +} + static ssize_t spectre_v2_show_state(char *buf) { if (spectre_v2_enabled == SPECTRE_V2_LFENCE) @@ -2214,12 +2253,13 @@ static ssize_t spectre_v2_show_state(char *buf) spectre_v2_enabled == SPECTRE_V2_EIBRS_LFENCE) return sprintf(buf, "Vulnerable: eIBRS+LFENCE with unprivileged eBPF and SMT\n"); - return sprintf(buf, "%s%s%s%s%s%s\n", + return sprintf(buf, "%s%s%s%s%s%s%s\n", spectre_v2_strings[spectre_v2_enabled], ibpb_state(), boot_cpu_has(X86_FEATURE_USE_IBRS_FW) ? ", IBRS_FW" : "", stibp_state(), boot_cpu_has(X86_FEATURE_RSB_CTXSW) ? ", RSB filling" : "", + pbrsb_eibrs_state(), spectre_v2_module_string()); } diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 901352bd3b42..9fc91482e85e 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1024,6 +1024,7 @@ static void identify_cpu_without_cpuid(struct cpuinfo_x86 *c) #define NO_SWAPGS BIT(6) #define NO_ITLB_MULTIHIT BIT(7) #define NO_SPECTRE_V2 BIT(8) +#define NO_EIBRS_PBRSB BIT(9) #define VULNWL(vendor, family, model, whitelist) \ X86_MATCH_VENDOR_FAM_MODEL(vendor, family, model, whitelist) @@ -1064,7 +1065,7 @@ static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = { VULNWL_INTEL(ATOM_GOLDMONT, NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT), VULNWL_INTEL(ATOM_GOLDMONT_D, NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT), - VULNWL_INTEL(ATOM_GOLDMONT_PLUS, NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT), + VULNWL_INTEL(ATOM_GOLDMONT_PLUS, NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_EIBRS_PBRSB), /* * Technically, swapgs isn't serializing on AMD (despite it previously @@ -1074,7 +1075,9 @@ static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = { * good enough for our purposes. */ - VULNWL_INTEL(ATOM_TREMONT_D, NO_ITLB_MULTIHIT), + VULNWL_INTEL(ATOM_TREMONT, NO_EIBRS_PBRSB), + VULNWL_INTEL(ATOM_TREMONT_L, NO_EIBRS_PBRSB), + VULNWL_INTEL(ATOM_TREMONT_D, NO_ITLB_MULTIHIT | NO_EIBRS_PBRSB), /* AMD Family 0xf - 0x12 */ VULNWL_AMD(0x0f, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT), @@ -1252,6 +1255,11 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c) setup_force_cpu_bug(X86_BUG_RETBLEED); } + if (cpu_has(c, X86_FEATURE_IBRS_ENHANCED) && + !cpu_matches(cpu_vuln_whitelist, NO_EIBRS_PBRSB) && + !(ia32_cap & ARCH_CAP_PBRSB_NO)) + setup_force_cpu_bug(X86_BUG_EIBRS_PBRSB); + if (cpu_matches(cpu_vuln_whitelist, NO_MELTDOWN)) return; diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S index 857fa0fc49fa..982138bebb70 100644 --- a/arch/x86/kvm/vmx/vmenter.S +++ b/arch/x86/kvm/vmx/vmenter.S @@ -197,11 +197,13 @@ SYM_INNER_LABEL(vmx_vmexit, SYM_L_GLOBAL) * entries and (in some cases) RSB underflow. * * eIBRS has its own protection against poisoned RSB, so it doesn't - * need the RSB filling sequence. But it does need to be enabled - * before the first unbalanced RET. + * need the RSB filling sequence. But it does need to be enabled, and a + * single call to retire, before the first unbalanced RET. */ - FILL_RETURN_BUFFER %_ASM_CX, RSB_CLEAR_LOOPS, X86_FEATURE_RSB_VMEXIT + FILL_RETURN_BUFFER %_ASM_CX, RSB_CLEAR_LOOPS, X86_FEATURE_RSB_VMEXIT,\ + X86_FEATURE_RSB_VMEXIT_LITE + pop %_ASM_ARG2 /* @flags */ pop %_ASM_ARG1 /* @vmx */ diff --git a/tools/arch/x86/include/asm/cpufeatures.h b/tools/arch/x86/include/asm/cpufeatures.h index 54ba20492ad1..ec53f52a06a5 100644 --- a/tools/arch/x86/include/asm/cpufeatures.h +++ b/tools/arch/x86/include/asm/cpufeatures.h @@ -296,6 +296,7 @@ #define X86_FEATURE_RETPOLINE_LFENCE (11*32+13) /* "" Use LFENCE for Spectre variant 2 */ #define X86_FEATURE_RETHUNK (11*32+14) /* "" Use REturn THUNK */ #define X86_FEATURE_UNRET (11*32+15) /* "" AMD BTB untrain return */ +#define X86_FEATURE_RSB_VMEXIT_LITE (11*32+17) /* "" Fill RSB on VM-Exit when EIBRS is enabled */ /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */ #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */ diff --git a/tools/arch/x86/include/asm/msr-index.h b/tools/arch/x86/include/asm/msr-index.h index 53373ca3b487..b8954262d767 100644 --- a/tools/arch/x86/include/asm/msr-index.h +++ b/tools/arch/x86/include/asm/msr-index.h @@ -148,6 +148,10 @@ * are restricted to targets in * kernel. */ +#define ARCH_CAP_PBRSB_NO BIT(24) /* + * Not susceptible to Post-Barrier + * Return Stack Buffer Predictions. + */ #define MSR_IA32_FLUSH_CMD 0x0000010b #define L1D_FLUSH BIT(0) /* -- 2.20.1

1 17

[PATCH openEuler-1.0-LTS 0/2] fix the i40e crash problem
by tangbin 20 Sep '22

20 Sep '22

The two patches solve the crash of i40e Ivan Vecera (1): i40e: Fix kernel crash during module removal Yunjian Wang (1): i40e: Fix use-after-free in i40e_client_subtask() drivers/net/ethernet/intel/i40e/i40e_client.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) -- 2.18.4

1 2

[PATCH openEuler-5.10 000/139] Add patches for CVE-2022-29900,
by Zheng Zengkai 20 Sep '22

20 Sep '22

Patches for CVE-2022-29900, CVE-2022-23816 and CVE-2022-29901 Reference: https://lore.kernel.org/all/CAODzB9qH9WhxQ0eB+mNvmsn64bHXUVppuSTMDGJekYOPCw… https://www.amd.com/system/files/documents/technical-guidance-for-mitigatin… https://www.intel.com/content/www/us/en/developer/articles/technical/softwa… Alexandre Chartre (2): x86/bugs: Report AMD retbleed vulnerability x86/bugs: Add AMD retbleed= boot parameter Andrew Cooper (1): x86/cpu/amd: Enumerate BTC_NO Arnaldo Carvalho de Melo (5): tools arch: Update arch/x86/lib/mem{cpy,set}_64.S copies used in 'perf bench mem memcpy' tools arch x86: Sync the msr-index.h copy with the kernel sources tools headers cpufeatures: Sync with the kernel sources tools arch: Update arch/x86/lib/mem{cpy,set}_64.S copies used in 'perf bench mem memcpy' - again tools headers: Remove broken definition of __LITTLE_ENDIAN Ben Hutchings (3): x86: Add insn_decode_kernel() Makefile: Set retpoline cflags based on CONFIG_CC_IS_{CLANG,GCC} x86/xen: Fix initialisation in hypercall_page after rethunk Borislav Petkov (7): x86/insn: Rename insn_decode() to insn_decode_from_regs() x86/insn: Add a __ignore_sync_check__ marker x86/insn: Add an insn_decode() API x86/alternative: Use insn_decode() x86/alternative: Optimize single-byte NOPs at an arbitrary position kvm/emulate: Fix SETcc emulation function offsets with SLS tools/insn: Restore the relative include paths for cross building Greg Kroah-Hartman (1): x86, kvm: use proper ASM macros for kvm_vcpu_is_preempted Joe Lawrence (1): objtool: Make .altinstructions section entry size consistent Josh Poimboeuf (24): objtool: Refactor ORC section generation objtool: Add 'alt_group' struct objtool: Support stack layout changes in alternatives objtool: Support retpoline jump detection for vmlinux.o objtool: Assume only ELF functions do sibling calls objtool: Combine UNWIND_HINT_RET_OFFSET and UNWIND_HINT_FUNC x86/xen: Support objtool validation in xen-asm.S x86/xen: Support objtool vmlinux.o validation in xen-head.S objtool: Support asm jump tables objtool: Don't make .altinstructions writable objtool: Remove reloc symbol type checks in get_alt_entry() x86/bugs: Do IBPB fallback check only once x86/speculation: Fix RSB filling with CONFIG_RETPOLINE=n x86/speculation: Fix firmware entry SPEC_CTRL handling x86/speculation: Fix SPEC_CTRL write on SMT state change x86/speculation: Use cached host SPEC_CTRL value for guest entry/exit x86/speculation: Remove x86_spec_ctrl_mask objtool: Re-add UNWIND_HINT_{SAVE_RESTORE} KVM: VMX: Flatten __vmx_vcpu_run() KVM: VMX: Convert launched argument to flags KVM: VMX: Prevent guest RSB poisoning attacks with eIBRS KVM: VMX: Fix IBRS handling after vmexit x86/speculation: Fill RSB on vmexit for IBRS x86/ftrace: Add UNWIND_HINT_FUNC annotation for ftrace_stub Juergen Gross (4): x86/alternative: Merge include files x86/alternative: Support not-feature x86/alternative: Support ALTERNATIVE_TERNARY x86/alternative: Use ALTERNATIVE_TERNARY() in _static_cpu_has() Kim Phillips (3): x86/sev: Avoid using __x86_return_thunk x86/bugs: Enable STIBP for JMP2RET x86/bugs: Remove apostrophe typo Konrad Rzeszutek Wilk (1): x86/kexec: Disable RET on kexec Lin Yujun (2): x86: Fix objtool build warning Re-add padlen to the structure alt_instr Linus Torvalds (2): objtool: print out the symbol type when complaining about it kvm: fix objtool relocation warning Nathan Chancellor (1): x86/speculation: Use DECLARE_PER_CPU for x86_spec_ctrl_current Pawan Gupta (3): x86/speculation: Add spectre_v2=ibrs option to support Kernel IBRS x86/bugs: Add Cannon lake to RETBleed affected CPU list x86/speculation: Disable RRSBA behavior Peter Zijlstra (70): x86/alternatives: Optimize optimize_nops() x86/retpoline: Simplify retpolines objtool: Correctly handle retpoline thunk calls objtool: Handle per arch retpoline naming objtool: Rework the elf_rebuild_reloc_section() logic objtool: Add elf_create_reloc() helper objtool: Create reloc sections implicitly objtool: Extract elf_strtab_concat() objtool: Extract elf_symbol_add() objtool: Add elf_create_undef_symbol() objtool: Keep track of retpoline call sites objtool: Cache instruction relocs objtool: Skip magical retpoline .altinstr_replacement objtool/x86: Rewrite retpoline thunk calls objtool: Fix .symtab_shndx handling for elf_create_undef_symbol() objtool: Only rewrite unconditional retpoline thunk calls objtool/x86: Ignore __x86_indirect_alt_* symbols objtool: Teach get_alt_entry() about more relocation types objtool: Introduce CFI hash objtool: Handle __sanitize_cov*() tail calls objtool: Classify symbols objtool: Explicitly avoid self modifying code in .altinstr_replacement objtool,x86: Replace alternatives with .retpoline_sites x86/retpoline: Remove unused replacement symbols x86/asm: Fix register order x86/asm: Fixup odd GEN-for-each-reg.h usage x86/retpoline: Move the retpoline thunk declarations to nospec-branch.h x86/retpoline: Create a retpoline thunk array x86/alternative: Implement .retpoline_sites support bpf,x86: Simplify computing label offsets bpf,x86: Respect X86_FEATURE_RETPOLINE* x86/lib/atomic64_386_32: Rename things x86: Prepare asm files for straight-line-speculation x86: Prepare inline-asm for straight-line-speculation x86/alternative: Relax text_poke_bp() constraint objtool: Add straight-line-speculation validation x86: Add straight-line-speculation mitigation objtool: Default ignore INT3 for unreachable crypto: x86/poly1305 - Fixup SLS objtool: Fix SLS validation for kcov tail-call replacement x86/entry: Remove skip_r11rcx x86/kvm/vmx: Make noinstr clean x86/cpufeatures: Move RETPOLINE flags to word 11 x86/retpoline: Cleanup some #ifdefery x86/retpoline: Swizzle retpoline thunk x86/retpoline: Use -mfunction-return x86: Undo return-thunk damage x86,objtool: Create .return_sites x86,static_call: Use alternative RET encoding x86/ftrace: Use alternative RET encoding x86/bpf: Use alternative RET encoding x86/kvm: Fix SETcc emulation for return thunks x86/vsyscall_emu/64: Don't use RET in vsyscall emulation x86: Use return-thunk in asm code objtool: Treat .text.__x86.* as noinstr x86: Add magic AMD return-thunk x86/bugs: Keep a per-CPU IA32_SPEC_CTRL value x86/entry: Add kernel IBRS implementation x86/bugs: Optimize SPEC_CTRL MSR writes x86/bugs: Split spectre_v2_select_mitigation() and spectre_v2_user_select_mitigation() x86/bugs: Report Intel retbleed vulnerability intel_idle: Disable IBRS during long idle objtool: Update Retpoline validation x86/xen: Rename SYS* entry points x86/bugs: Add retbleed=ibpb objtool: Add entry UNRET validation x86/cpu/amd: Add Spectral Chicken x86/common: Stamp out the stepping madness x86/retbleed: Add fine grained Kconfig knobs um: Add missing apply_returns() Thadeu Lima de Souza Cascardo (5): x86/realmode: build with -D__DISABLE_EXPORTS objtool: skip non-text sections when adding return-thunk sites x86/bugs: Do not enable IBPB-on-entry when IBPB is not supported efi/x86: use naked RET on mixed mode call wrapper x86/kvm: fix FASTOP_SIZE when return thunks are enabled Thomas Gleixner (1): x86/static_call: Serialize __static_call_fixup() properly Uros Bizjak (2): KVM/VMX: Use TEST %REG,%REG instead of CMP $0,%REG in vmenter.S KVM/nVMX: Use __vmx_vcpu_run in nested_vmx_check_vmentry_hw Vasily Gorbik (1): objtool: Fix elf_create_undef_symbol() endianness .../admin-guide/kernel-parameters.txt | 25 + Makefile | 20 +- arch/um/kernel/um_arch.c | 8 + arch/x86/Kconfig | 91 +- arch/x86/Makefile | 8 +- arch/x86/boot/compressed/efi_thunk_64.S | 2 +- arch/x86/boot/compressed/head_64.S | 4 +- arch/x86/boot/compressed/mem_encrypt.S | 4 +- arch/x86/crypto/aegis128-aesni-asm.S | 48 +- arch/x86/crypto/aes_ctrby8_avx-x86_64.S | 2 +- arch/x86/crypto/aesni-intel_asm.S | 52 +- arch/x86/crypto/aesni-intel_avx-x86_64.S | 40 +- arch/x86/crypto/blake2s-core.S | 4 +- arch/x86/crypto/blowfish-x86_64-asm_64.S | 12 +- arch/x86/crypto/camellia-aesni-avx-asm_64.S | 18 +- arch/x86/crypto/camellia-aesni-avx2-asm_64.S | 18 +- arch/x86/crypto/camellia-x86_64-asm_64.S | 12 +- arch/x86/crypto/cast5-avx-x86_64-asm_64.S | 12 +- arch/x86/crypto/cast6-avx-x86_64-asm_64.S | 16 +- arch/x86/crypto/chacha-avx2-x86_64.S | 6 +- arch/x86/crypto/chacha-avx512vl-x86_64.S | 6 +- arch/x86/crypto/chacha-ssse3-x86_64.S | 8 +- arch/x86/crypto/crc32-pclmul_asm.S | 2 +- arch/x86/crypto/crc32c-pcl-intel-asm_64.S | 2 +- arch/x86/crypto/crct10dif-pcl-asm_64.S | 2 +- arch/x86/crypto/des3_ede-asm_64.S | 4 +- arch/x86/crypto/ghash-clmulni-intel_asm.S | 6 +- arch/x86/crypto/nh-avx2-x86_64.S | 2 +- arch/x86/crypto/nh-sse2-x86_64.S | 2 +- arch/x86/crypto/poly1305-x86_64-cryptogams.pl | 38 +- arch/x86/crypto/serpent-avx-x86_64-asm_64.S | 16 +- arch/x86/crypto/serpent-avx2-asm_64.S | 16 +- arch/x86/crypto/serpent-sse2-i586-asm_32.S | 6 +- arch/x86/crypto/serpent-sse2-x86_64-asm_64.S | 6 +- arch/x86/crypto/sha1_avx2_x86_64_asm.S | 2 +- arch/x86/crypto/sha1_ni_asm.S | 2 +- arch/x86/crypto/sha1_ssse3_asm.S | 2 +- arch/x86/crypto/sha256-avx-asm.S | 2 +- arch/x86/crypto/sha256-avx2-asm.S | 2 +- arch/x86/crypto/sha256-ssse3-asm.S | 2 +- arch/x86/crypto/sha256_ni_asm.S | 2 +- arch/x86/crypto/sha512-avx-asm.S | 2 +- arch/x86/crypto/sha512-avx2-asm.S | 2 +- arch/x86/crypto/sha512-ssse3-asm.S | 2 +- arch/x86/crypto/twofish-avx-x86_64-asm_64.S | 16 +- arch/x86/crypto/twofish-i586-asm_32.S | 4 +- arch/x86/crypto/twofish-x86_64-asm_64-3way.S | 6 +- arch/x86/crypto/twofish-x86_64-asm_64.S | 4 +- arch/x86/entry/Makefile | 2 +- arch/x86/entry/calling.h | 72 +- arch/x86/entry/entry.S | 22 + arch/x86/entry/entry_32.S | 6 +- arch/x86/entry/entry_64.S | 62 +- arch/x86/entry/entry_64_compat.S | 21 +- arch/x86/entry/thunk_32.S | 2 +- arch/x86/entry/thunk_64.S | 2 +- arch/x86/entry/vdso/Makefile | 1 + arch/x86/entry/vdso/vdso32/system_call.S | 4 +- arch/x86/entry/vsyscall/vsyscall_emu_64.S | 3 + arch/x86/include/asm/GEN-for-each-reg.h | 14 +- arch/x86/include/asm/alternative-asm.h | 114 -- arch/x86/include/asm/alternative.h | 133 +- arch/x86/include/asm/asm-prototypes.h | 17 - arch/x86/include/asm/cpufeature.h | 41 +- arch/x86/include/asm/cpufeatures.h | 12 +- arch/x86/include/asm/disabled-features.h | 21 +- arch/x86/include/asm/inat.h | 2 +- arch/x86/include/asm/insn-eval.h | 4 +- arch/x86/include/asm/insn.h | 28 +- arch/x86/include/asm/linkage.h | 22 + arch/x86/include/asm/msr-index.h | 13 + arch/x86/include/asm/nospec-branch.h | 148 ++- arch/x86/include/asm/paravirt.h | 2 +- arch/x86/include/asm/qspinlock_paravirt.h | 4 +- arch/x86/include/asm/smap.h | 5 +- arch/x86/include/asm/static_call.h | 19 +- arch/x86/include/asm/unwind_hints.h | 23 +- arch/x86/kernel/acpi/wakeup_32.S | 6 +- arch/x86/kernel/alternative.c | 356 +++++- arch/x86/kernel/cpu/amd.c | 46 +- arch/x86/kernel/cpu/bugs.c | 475 ++++++- arch/x86/kernel/cpu/common.c | 61 +- arch/x86/kernel/cpu/cpu.h | 2 + arch/x86/kernel/cpu/hygon.c | 6 + arch/x86/kernel/cpu/scattered.c | 1 + arch/x86/kernel/ftrace.c | 7 +- arch/x86/kernel/ftrace_32.S | 6 +- arch/x86/kernel/ftrace_64.S | 13 +- arch/x86/kernel/head_32.S | 2 +- arch/x86/kernel/head_64.S | 5 + arch/x86/kernel/irqflags.S | 4 +- arch/x86/kernel/kprobes/core.c | 2 +- arch/x86/kernel/kvm.c | 2 +- arch/x86/kernel/module.c | 15 +- arch/x86/kernel/paravirt.c | 2 +- arch/x86/kernel/process.c | 2 +- arch/x86/kernel/relocate_kernel_32.S | 15 +- arch/x86/kernel/relocate_kernel_64.S | 13 +- arch/x86/kernel/sev-es.c | 2 +- arch/x86/kernel/sev_verify_cbit.S | 2 +- arch/x86/kernel/static_call.c | 52 +- arch/x86/kernel/umip.c | 2 +- arch/x86/kernel/verify_cpu.S | 4 +- arch/x86/kernel/vmlinux.lds.S | 23 +- arch/x86/kvm/emulate.c | 39 +- arch/x86/kvm/svm/vmenter.S | 11 +- arch/x86/kvm/vmx/nested.c | 32 +- arch/x86/kvm/vmx/run_flags.h | 8 + arch/x86/kvm/vmx/vmenter.S | 170 +-- arch/x86/kvm/vmx/vmx.c | 78 +- arch/x86/kvm/vmx/vmx.h | 5 + arch/x86/kvm/x86.c | 4 +- arch/x86/lib/atomic64_386_32.S | 88 +- arch/x86/lib/atomic64_cx8_32.S | 18 +- arch/x86/lib/checksum_32.S | 8 +- arch/x86/lib/clear_page_64.S | 6 +- arch/x86/lib/cmpxchg16b_emu.S | 4 +- arch/x86/lib/cmpxchg8b_emu.S | 4 +- arch/x86/lib/copy_mc_64.S | 6 +- arch/x86/lib/copy_page_64.S | 10 +- arch/x86/lib/copy_user_64.S | 12 +- arch/x86/lib/csum-copy_64.S | 2 +- arch/x86/lib/error-inject.c | 3 +- arch/x86/lib/getuser.S | 22 +- arch/x86/lib/hweight.S | 6 +- arch/x86/lib/inat.c | 2 +- arch/x86/lib/insn-eval.c | 6 +- arch/x86/lib/insn.c | 222 +++- arch/x86/lib/iomap_copy_64.S | 2 +- arch/x86/lib/memcpy_64.S | 14 +- arch/x86/lib/memmove_64.S | 11 +- arch/x86/lib/memset_64.S | 8 +- arch/x86/lib/msr-reg.S | 4 +- arch/x86/lib/putuser.S | 6 +- arch/x86/lib/retpoline.S | 118 +- arch/x86/math-emu/div_Xsig.S | 2 +- arch/x86/math-emu/div_small.S | 2 +- arch/x86/math-emu/mul_Xsig.S | 6 +- arch/x86/math-emu/polynom_Xsig.S | 2 +- arch/x86/math-emu/reg_norm.S | 6 +- arch/x86/math-emu/reg_round.S | 2 +- arch/x86/math-emu/reg_u_add.S | 2 +- arch/x86/math-emu/reg_u_div.S | 2 +- arch/x86/math-emu/reg_u_mul.S | 2 +- arch/x86/math-emu/reg_u_sub.S | 2 +- arch/x86/math-emu/round_Xsig.S | 4 +- arch/x86/math-emu/shr_Xsig.S | 8 +- arch/x86/math-emu/wm_shrx.S | 16 +- arch/x86/mm/mem_encrypt_boot.S | 6 + arch/x86/net/bpf_jit_comp.c | 185 ++- arch/x86/net/bpf_jit_comp32.c | 22 +- arch/x86/platform/efi/efi_stub_32.S | 2 +- arch/x86/platform/efi/efi_stub_64.S | 2 +- arch/x86/platform/efi/efi_thunk_64.S | 5 +- arch/x86/platform/olpc/xo1-wakeup.S | 6 +- arch/x86/power/hibernate_asm_32.S | 4 +- arch/x86/power/hibernate_asm_64.S | 4 +- arch/x86/um/checksum_32.S | 4 +- arch/x86/um/setjmp_32.S | 2 +- arch/x86/um/setjmp_64.S | 2 +- arch/x86/xen/Makefile | 1 - arch/x86/xen/setup.c | 6 +- arch/x86/xen/xen-asm.S | 43 +- arch/x86/xen/xen-head.S | 6 +- arch/x86/xen/xen-ops.h | 6 +- drivers/base/cpu.c | 8 + drivers/idle/intel_idle.c | 43 +- include/linux/cpu.h | 2 + include/linux/kvm_host.h | 2 +- include/linux/objtool.h | 14 +- samples/ftrace/ftrace-direct-modify.c | 4 +- samples/ftrace/ftrace-direct-too.c | 2 +- samples/ftrace/ftrace-direct.c | 2 +- scripts/Makefile.build | 6 + scripts/link-vmlinux.sh | 6 + security/Kconfig | 11 - tools/arch/x86/include/asm/cpufeatures.h | 12 +- .../arch/x86/include/asm/disabled-features.h | 21 +- tools/arch/x86/include/asm/inat.h | 2 +- tools/arch/x86/include/asm/insn.h | 28 +- tools/arch/x86/include/asm/msr-index.h | 13 + tools/arch/x86/lib/inat.c | 2 +- tools/arch/x86/lib/insn.c | 222 +++- tools/arch/x86/lib/memcpy_64.S | 14 +- tools/arch/x86/lib/memset_64.S | 8 +- .../asm/{alternative-asm.h => alternative.h} | 0 tools/include/linux/kconfig.h | 67 + tools/include/linux/objtool.h | 14 +- .../Documentation/stack-validation.txt | 16 +- tools/objtool/Makefile | 4 - tools/objtool/arch.h | 13 +- tools/objtool/arch/x86/decode.c | 58 +- tools/objtool/builtin-check.c | 6 +- tools/objtool/builtin-orc.c | 6 +- tools/objtool/builtin.h | 3 +- tools/objtool/cfi.h | 2 + tools/objtool/check.c | 1131 +++++++++++++---- tools/objtool/check.h | 35 +- tools/objtool/elf.c | 230 ++-- tools/objtool/elf.h | 20 +- tools/objtool/objtool.c | 2 + tools/objtool/objtool.h | 5 +- tools/objtool/orc_gen.c | 324 ++--- tools/objtool/special.c | 22 +- tools/objtool/sync-check.sh | 17 +- tools/objtool/weak.c | 7 +- tools/perf/check-headers.sh | 15 +- 207 files changed, 4322 insertions(+), 1901 deletions(-) create mode 100644 arch/x86/entry/entry.S delete mode 100644 arch/x86/include/asm/alternative-asm.h create mode 100644 arch/x86/kvm/vmx/run_flags.h rename tools/include/asm/{alternative-asm.h => alternative.h} (100%) create mode 100644 tools/include/linux/kconfig.h -- 2.20.1

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[PATCH openEuler-5.10] KVM: x86: do not report a vCPU as preempted outside instruction boundaries
by Zheng Zengkai 20 Sep '22

20 Sep '22

From: Paolo Bonzini <pbonzini(a)redhat.com> mainline inclusion from mainline-v5.19-rc2 commit 6cd88243c7e03845a450795e134b488fc2afb736 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5PJ7H CVE: CVE-2022-39189 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… ---------------------------------------- If a vCPU is outside guest mode and is scheduled out, it might be in the process of making a memory access. A problem occurs if another vCPU uses the PV TLB flush feature during the period when the vCPU is scheduled out, and a virtual address has already been translated but has not yet been accessed, because this is equivalent to using a stale TLB entry. To avoid this, only report a vCPU as preempted if sure that the guest is at an instruction boundary. A rescheduling request will be delivered to the host physical CPU as an external interrupt, so for simplicity consider any vmexit *not* instruction boundary except for external interrupts. It would in principle be okay to report the vCPU as preempted also if it is sleeping in kvm_vcpu_block(): a TLB flush IPI will incur the vmentry/vmexit overhead unnecessarily, and optimistic spinning is also unlikely to succeed. However, leave it for later because right now kvm_vcpu_check_block() is doing memory accesses. Even though the TLB flush issue only applies to virtual memory address, it's very much preferrable to be conservative. Reported-by: Jann Horn <jannh(a)google.com> Signed-off-by: Paolo Bonzini <pbonzini(a)redhat.com> conflict: arch/x86/kvm/x86.c Signed-off-by: Guo Mengqi <guomengqi3(a)huawei.com> Reviewed-by: Xiu Jianfeng <xiujianfeng(a)huawei.com> Reviewed-by: Weilong Chen <chenweilong(a)huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai(a)huawei.com> --- arch/x86/include/asm/kvm_host.h | 3 +++ arch/x86/kvm/svm/svm.c | 2 ++ arch/x86/kvm/vmx/vmx.c | 1 + arch/x86/kvm/x86.c | 24 ++++++++++++++++++++++++ 4 files changed, 30 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 3d9da4629325..5103638cc911 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -553,6 +553,7 @@ struct kvm_vcpu_arch { u64 ia32_misc_enable_msr; u64 smbase; u64 smi_count; + bool at_instruction_boundary; bool tpr_access_reporting; bool xsaves_enabled; u64 ia32_xss; @@ -1077,6 +1078,8 @@ struct kvm_vcpu_stat { u64 utime; u64 stime; u64 gtime; + u64 preemption_reported; + u64 preemption_other; u64 preemption_timer_exits; }; diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 2124fe54abfb..5231f40e8312 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3992,6 +3992,8 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu, static void svm_handle_exit_irqoff(struct kvm_vcpu *vcpu) { + if (to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_INTR) + vcpu->arch.at_instruction_boundary = true; } static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 6bb07e495eca..fad74e5faade 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -6605,6 +6605,7 @@ static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu) return; handle_interrupt_nmi_irqoff(vcpu, gate_offset(desc)); + vcpu->arch.at_instruction_boundary = true; } static void vmx_handle_exit_irqoff(struct kvm_vcpu *vcpu) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 284bf9b0c12c..c275efd0bb70 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -233,6 +233,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { VCPU_STAT("l1d_flush", l1d_flush), VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns), VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns), + VCPU_STAT("preemption_reported", preemption_reported), + VCPU_STAT("preemption_other", preemption_other), VM_STAT("mmu_shadow_zapped", mmu_shadow_zapped), VM_STAT("mmu_pte_write", mmu_pte_write), VM_STAT("mmu_pde_zapped", mmu_pde_zapped), @@ -287,6 +289,8 @@ struct dfx_kvm_stats_debugfs_item dfx_debugfs_entries[] = { DFX_STAT("stime", stime), DFX_STAT("gtime", gtime), DFX_STAT("preemption_timer_exits", preemption_timer_exits), + DFX_STAT("preemption_reported", preemption_reported), + DFX_STAT("preemption_other", preemption_other), { NULL } }; @@ -4082,6 +4086,19 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu) struct kvm_host_map map; struct kvm_steal_time *st; + /* + * The vCPU can be marked preempted if and only if the VM-Exit was on + * an instruction boundary and will not trigger guest emulation of any + * kind (see vcpu_run). Vendor specific code controls (conservatively) + * when this is true, for example allowing the vCPU to be marked + * preempted if and only if the VM-Exit was due to a host interrupt. + */ + if (!vcpu->arch.at_instruction_boundary) { + vcpu->stat.preemption_other++; + return; + } + + vcpu->stat.preemption_reported++; if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) return; @@ -9329,6 +9346,13 @@ static int vcpu_run(struct kvm_vcpu *vcpu) vcpu->arch.l1tf_flush_l1d = true; for (;;) { + /* + * If another guest vCPU requests a PV TLB flush in the middle + * of instruction emulation, the rest of the emulation could + * use a stale page translation. Assume that any code after + * this point can start executing an instruction. + */ + vcpu->arch.at_instruction_boundary = false; if (kvm_vcpu_running(vcpu)) { r = vcpu_enter_guest(vcpu); } else { -- 2.20.1

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Kernel September 2022