From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- arch/s390/kernel/nmi.c | 527 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 527 insertions(+) create mode 100644 arch/s390/kernel/nmi.c (limited to 'arch/s390/kernel/nmi.c') diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c new file mode 100644 index 000000000..5dbf27471 --- /dev/null +++ b/arch/s390/kernel/nmi.c @@ -0,0 +1,527 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Machine check handler + * + * Copyright IBM Corp. 2000, 2009 + * Author(s): Ingo Adlung , + * Martin Schwidefsky , + * Cornelia Huck , + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct mcck_struct { + unsigned int kill_task : 1; + unsigned int channel_report : 1; + unsigned int warning : 1; + unsigned int stp_queue : 1; + unsigned long mcck_code; +}; + +static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck); + +static inline int nmi_needs_mcesa(void) +{ + return MACHINE_HAS_VX || MACHINE_HAS_GS; +} + +/* + * The initial machine check extended save area for the boot CPU. + * It will be replaced on the boot CPU reinit with an allocated + * structure. The structure is required for machine check happening + * early in the boot process. + */ +static struct mcesa boot_mcesa __aligned(MCESA_MAX_SIZE); + +void __init nmi_alloc_mcesa_early(u64 *mcesad) +{ + if (!nmi_needs_mcesa()) + return; + *mcesad = __pa(&boot_mcesa); + if (MACHINE_HAS_GS) + *mcesad |= ilog2(MCESA_MAX_SIZE); +} + +int nmi_alloc_mcesa(u64 *mcesad) +{ + unsigned long size; + void *origin; + + *mcesad = 0; + if (!nmi_needs_mcesa()) + return 0; + size = MACHINE_HAS_GS ? MCESA_MAX_SIZE : MCESA_MIN_SIZE; + origin = kmalloc(size, GFP_KERNEL); + if (!origin) + return -ENOMEM; + /* The pointer is stored with mcesa_bits ORed in */ + kmemleak_not_leak(origin); + *mcesad = __pa(origin); + if (MACHINE_HAS_GS) + *mcesad |= ilog2(MCESA_MAX_SIZE); + return 0; +} + +void nmi_free_mcesa(u64 *mcesad) +{ + if (!nmi_needs_mcesa()) + return; + kfree(__va(*mcesad & MCESA_ORIGIN_MASK)); +} + +static __always_inline char *nmi_puts(char *dest, const char *src) +{ + while (*src) + *dest++ = *src++; + *dest = 0; + return dest; +} + +static __always_inline char *u64_to_hex(char *dest, u64 val) +{ + int i, num; + + for (i = 1; i <= 16; i++) { + num = (val >> (64 - 4 * i)) & 0xf; + if (num >= 10) + *dest++ = 'A' + num - 10; + else + *dest++ = '0' + num; + } + *dest = 0; + return dest; +} + +static notrace void s390_handle_damage(void) +{ + union ctlreg0 cr0, cr0_new; + char message[100]; + psw_t psw_save; + char *ptr; + + smp_emergency_stop(); + diag_amode31_ops.diag308_reset(); + ptr = nmi_puts(message, "System stopped due to unrecoverable machine check, code: 0x"); + u64_to_hex(ptr, S390_lowcore.mcck_interruption_code); + + /* + * Disable low address protection and make machine check new PSW a + * disabled wait PSW. Any additional machine check cannot be handled. + */ + __ctl_store(cr0.val, 0, 0); + cr0_new = cr0; + cr0_new.lap = 0; + __ctl_load(cr0_new.val, 0, 0); + psw_save = S390_lowcore.mcck_new_psw; + psw_bits(S390_lowcore.mcck_new_psw).io = 0; + psw_bits(S390_lowcore.mcck_new_psw).ext = 0; + psw_bits(S390_lowcore.mcck_new_psw).wait = 1; + sclp_emergency_printk(message); + + /* + * Restore machine check new PSW and control register 0 to original + * values. This makes possible system dump analysis easier. + */ + S390_lowcore.mcck_new_psw = psw_save; + __ctl_load(cr0.val, 0, 0); + disabled_wait(); + while (1); +} +NOKPROBE_SYMBOL(s390_handle_damage); + +/* + * Main machine check handler function. Will be called with interrupts disabled + * and machine checks enabled. + */ +void __s390_handle_mcck(void) +{ + struct mcck_struct mcck; + + /* + * Disable machine checks and get the current state of accumulated + * machine checks. Afterwards delete the old state and enable machine + * checks again. + */ + local_mcck_disable(); + mcck = *this_cpu_ptr(&cpu_mcck); + memset(this_cpu_ptr(&cpu_mcck), 0, sizeof(mcck)); + local_mcck_enable(); + + if (mcck.channel_report) + crw_handle_channel_report(); + /* + * A warning may remain for a prolonged period on the bare iron. + * (actually until the machine is powered off, or the problem is gone) + * So we just stop listening for the WARNING MCH and avoid continuously + * being interrupted. One caveat is however, that we must do this per + * processor and cannot use the smp version of ctl_clear_bit(). + * On VM we only get one interrupt per virtally presented machinecheck. + * Though one suffices, we may get one interrupt per (virtual) cpu. + */ + if (mcck.warning) { /* WARNING pending ? */ + static int mchchk_wng_posted = 0; + + /* Use single cpu clear, as we cannot handle smp here. */ + __ctl_clear_bit(14, 24); /* Disable WARNING MCH */ + if (xchg(&mchchk_wng_posted, 1) == 0) + kill_cad_pid(SIGPWR, 1); + } + if (mcck.stp_queue) + stp_queue_work(); + if (mcck.kill_task) { + local_irq_enable(); + printk(KERN_EMERG "mcck: Terminating task because of machine " + "malfunction (code 0x%016lx).\n", mcck.mcck_code); + printk(KERN_EMERG "mcck: task: %s, pid: %d.\n", + current->comm, current->pid); + make_task_dead(SIGSEGV); + } +} + +void noinstr s390_handle_mcck(struct pt_regs *regs) +{ + trace_hardirqs_off(); + pai_kernel_enter(regs); + __s390_handle_mcck(); + pai_kernel_exit(regs); + trace_hardirqs_on(); +} +/* + * returns 0 if register contents could be validated + * returns 1 otherwise + */ +static int notrace s390_validate_registers(union mci mci) +{ + struct mcesa *mcesa; + void *fpt_save_area; + union ctlreg2 cr2; + int kill_task; + u64 zero; + + kill_task = 0; + zero = 0; + + if (!mci.gr || !mci.fp) + kill_task = 1; + fpt_save_area = &S390_lowcore.floating_pt_save_area; + if (!mci.fc) { + kill_task = 1; + asm volatile( + " lfpc %0\n" + : + : "Q" (zero)); + } else { + asm volatile( + " lfpc %0\n" + : + : "Q" (S390_lowcore.fpt_creg_save_area)); + } + + mcesa = __va(S390_lowcore.mcesad & MCESA_ORIGIN_MASK); + if (!MACHINE_HAS_VX) { + /* Validate floating point registers */ + asm volatile( + " ld 0,0(%0)\n" + " ld 1,8(%0)\n" + " ld 2,16(%0)\n" + " ld 3,24(%0)\n" + " ld 4,32(%0)\n" + " ld 5,40(%0)\n" + " ld 6,48(%0)\n" + " ld 7,56(%0)\n" + " ld 8,64(%0)\n" + " ld 9,72(%0)\n" + " ld 10,80(%0)\n" + " ld 11,88(%0)\n" + " ld 12,96(%0)\n" + " ld 13,104(%0)\n" + " ld 14,112(%0)\n" + " ld 15,120(%0)\n" + : + : "a" (fpt_save_area) + : "memory"); + } else { + /* Validate vector registers */ + union ctlreg0 cr0; + + /* + * The vector validity must only be checked if not running a + * KVM guest. For KVM guests the machine check is forwarded by + * KVM and it is the responsibility of the guest to take + * appropriate actions. The host vector or FPU values have been + * saved by KVM and will be restored by KVM. + */ + if (!mci.vr && !test_cpu_flag(CIF_MCCK_GUEST)) + kill_task = 1; + cr0.val = S390_lowcore.cregs_save_area[0]; + cr0.afp = cr0.vx = 1; + __ctl_load(cr0.val, 0, 0); + asm volatile( + " la 1,%0\n" + " VLM 0,15,0,1\n" + " VLM 16,31,256,1\n" + : + : "Q" (*(struct vx_array *)mcesa->vector_save_area) + : "1"); + __ctl_load(S390_lowcore.cregs_save_area[0], 0, 0); + } + /* Validate access registers */ + asm volatile( + " lam 0,15,0(%0)\n" + : + : "a" (&S390_lowcore.access_regs_save_area) + : "memory"); + if (!mci.ar) + kill_task = 1; + /* Validate guarded storage registers */ + cr2.val = S390_lowcore.cregs_save_area[2]; + if (cr2.gse) { + if (!mci.gs) { + /* + * 2 cases: + * - machine check in kernel or userspace + * - machine check while running SIE (KVM guest) + * For kernel or userspace the userspace values of + * guarded storage control can not be recreated, the + * process must be terminated. + * For SIE the guest values of guarded storage can not + * be recreated. This is either due to a bug or due to + * GS being disabled in the guest. The guest will be + * notified by KVM code and the guests machine check + * handling must take care of this. The host values + * are saved by KVM and are not affected. + */ + if (!test_cpu_flag(CIF_MCCK_GUEST)) + kill_task = 1; + } else { + load_gs_cb((struct gs_cb *)mcesa->guarded_storage_save_area); + } + } + /* + * The getcpu vdso syscall reads CPU number from the programmable + * field of the TOD clock. Disregard the TOD programmable register + * validity bit and load the CPU number into the TOD programmable + * field unconditionally. + */ + set_tod_programmable_field(raw_smp_processor_id()); + /* Validate clock comparator register */ + set_clock_comparator(S390_lowcore.clock_comparator); + + if (!mci.ms || !mci.pm || !mci.ia) + kill_task = 1; + + return kill_task; +} +NOKPROBE_SYMBOL(s390_validate_registers); + +/* + * Backup the guest's machine check info to its description block + */ +static void notrace s390_backup_mcck_info(struct pt_regs *regs) +{ + struct mcck_volatile_info *mcck_backup; + struct sie_page *sie_page; + + /* r14 contains the sie block, which was set in sie64a */ + struct kvm_s390_sie_block *sie_block = + (struct kvm_s390_sie_block *) regs->gprs[14]; + + if (sie_block == NULL) + /* Something's seriously wrong, stop system. */ + s390_handle_damage(); + + sie_page = container_of(sie_block, struct sie_page, sie_block); + mcck_backup = &sie_page->mcck_info; + mcck_backup->mcic = S390_lowcore.mcck_interruption_code & + ~(MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE); + mcck_backup->ext_damage_code = S390_lowcore.external_damage_code; + mcck_backup->failing_storage_address + = S390_lowcore.failing_storage_address; +} +NOKPROBE_SYMBOL(s390_backup_mcck_info); + +#define MAX_IPD_COUNT 29 +#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */ + +#define ED_STP_ISLAND 6 /* External damage STP island check */ +#define ED_STP_SYNC 7 /* External damage STP sync check */ + +#define MCCK_CODE_NO_GUEST (MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE) + +/* + * machine check handler. + */ +int notrace s390_do_machine_check(struct pt_regs *regs) +{ + static int ipd_count; + static DEFINE_SPINLOCK(ipd_lock); + static unsigned long long last_ipd; + struct mcck_struct *mcck; + unsigned long long tmp; + irqentry_state_t irq_state; + union mci mci; + unsigned long mcck_dam_code; + int mcck_pending = 0; + + irq_state = irqentry_nmi_enter(regs); + + if (user_mode(regs)) + update_timer_mcck(); + inc_irq_stat(NMI_NMI); + mci.val = S390_lowcore.mcck_interruption_code; + mcck = this_cpu_ptr(&cpu_mcck); + + /* + * Reinject the instruction processing damages' machine checks + * including Delayed Access Exception into the guest + * instead of damaging the host if they happen in the guest. + */ + if (mci.pd && !test_cpu_flag(CIF_MCCK_GUEST)) { + if (mci.b) { + /* Processing backup -> verify if we can survive this */ + u64 z_mcic, o_mcic, t_mcic; + z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29); + o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 | + 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 | + 1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 | + 1ULL<<16); + t_mcic = mci.val; + + if (((t_mcic & z_mcic) != 0) || + ((t_mcic & o_mcic) != o_mcic)) { + s390_handle_damage(); + } + + /* + * Nullifying exigent condition, therefore we might + * retry this instruction. + */ + spin_lock(&ipd_lock); + tmp = get_tod_clock(); + if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME) + ipd_count++; + else + ipd_count = 1; + last_ipd = tmp; + if (ipd_count == MAX_IPD_COUNT) + s390_handle_damage(); + spin_unlock(&ipd_lock); + } else { + /* Processing damage -> stopping machine */ + s390_handle_damage(); + } + } + if (s390_validate_registers(mci)) { + if (!user_mode(regs)) + s390_handle_damage(); + /* + * Couldn't restore all register contents for the + * user space process -> mark task for termination. + */ + mcck->kill_task = 1; + mcck->mcck_code = mci.val; + mcck_pending = 1; + } + + /* + * Backup the machine check's info if it happens when the guest + * is running. + */ + if (test_cpu_flag(CIF_MCCK_GUEST)) + s390_backup_mcck_info(regs); + + if (mci.cd) { + /* Timing facility damage */ + s390_handle_damage(); + } + if (mci.ed && mci.ec) { + /* External damage */ + if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC)) + mcck->stp_queue |= stp_sync_check(); + if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND)) + mcck->stp_queue |= stp_island_check(); + mcck_pending = 1; + } + /* + * Reinject storage related machine checks into the guest if they + * happen when the guest is running. + */ + if (!test_cpu_flag(CIF_MCCK_GUEST)) { + /* Storage error uncorrected */ + if (mci.se) + s390_handle_damage(); + /* Storage key-error uncorrected */ + if (mci.ke) + s390_handle_damage(); + /* Storage degradation */ + if (mci.ds && mci.fa) + s390_handle_damage(); + } + if (mci.cp) { + /* Channel report word pending */ + mcck->channel_report = 1; + mcck_pending = 1; + } + if (mci.w) { + /* Warning pending */ + mcck->warning = 1; + mcck_pending = 1; + } + + /* + * If there are only Channel Report Pending and External Damage + * machine checks, they will not be reinjected into the guest + * because they refer to host conditions only. + */ + mcck_dam_code = (mci.val & MCIC_SUBCLASS_MASK); + if (test_cpu_flag(CIF_MCCK_GUEST) && + (mcck_dam_code & MCCK_CODE_NO_GUEST) != mcck_dam_code) { + /* Set exit reason code for host's later handling */ + *((long *)(regs->gprs[15] + __SF_SIE_REASON)) = -EINTR; + } + clear_cpu_flag(CIF_MCCK_GUEST); + + if (user_mode(regs) && mcck_pending) { + irqentry_nmi_exit(regs, irq_state); + return 1; + } + + if (mcck_pending) + schedule_mcck_handler(); + + irqentry_nmi_exit(regs, irq_state); + return 0; +} +NOKPROBE_SYMBOL(s390_do_machine_check); + +static int __init machine_check_init(void) +{ + ctl_set_bit(14, 25); /* enable external damage MCH */ + ctl_set_bit(14, 27); /* enable system recovery MCH */ + ctl_set_bit(14, 24); /* enable warning MCH */ + return 0; +} +early_initcall(machine_check_init); -- cgit v1.2.3