mirror of
https://github.com/edk2-porting/linux-next.git
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b61b159512
The previous code used the normal kernel stack for machine checks.
This is problematic when a machine check interrupts a system call
or interrupt handler right at the beginning where registers are set up.
Assume system_call is interrupted at the first instruction and a machine
check is triggered. The machine check handler is called, checks the PSW
to see whether it is coming from user space, notices that it is already
in kernel mode but %r15 still contains the user space stack. This would
lead to a kernel crash.
There are basically two ways of fixing that: Either using the 'critical
cleanup' approach which compares the address in the PSW to see whether
it is already at a point where the stack has been set up, or use an extra
stack for the machine check handler.
For simplicity, we will go with the second approach and allocate an extra
stack. This adds some memory overhead for large systems, but usually large
system have plenty of memory so this isn't really a concern. But it keeps
the mchk stack setup simple and less error prone.
Fixes: 0b0ed657fe ("s390: remove critical section cleanup from entry.S")
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Cc: <stable@kernel.org> # v5.8+
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
164 lines
7.0 KiB
C
164 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generate definitions needed by assembly language modules.
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* This code generates raw asm output which is post-processed to extract
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* and format the required data.
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*/
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#define ASM_OFFSETS_C
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#include <linux/kbuild.h>
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#include <linux/kvm_host.h>
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#include <linux/sched.h>
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#include <linux/purgatory.h>
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#include <linux/pgtable.h>
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#include <asm/idle.h>
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#include <asm/gmap.h>
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#include <asm/nmi.h>
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#include <asm/stacktrace.h>
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int main(void)
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{
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/* task struct offsets */
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OFFSET(__TASK_stack, task_struct, stack);
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OFFSET(__TASK_thread, task_struct, thread);
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OFFSET(__TASK_pid, task_struct, pid);
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BLANK();
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/* thread struct offsets */
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OFFSET(__THREAD_ksp, thread_struct, ksp);
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BLANK();
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/* thread info offsets */
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OFFSET(__TI_flags, task_struct, thread_info.flags);
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BLANK();
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/* pt_regs offsets */
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OFFSET(__PT_PSW, pt_regs, psw);
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OFFSET(__PT_GPRS, pt_regs, gprs);
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OFFSET(__PT_ORIG_GPR2, pt_regs, orig_gpr2);
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OFFSET(__PT_FLAGS, pt_regs, flags);
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OFFSET(__PT_CR1, pt_regs, cr1);
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DEFINE(__PT_SIZE, sizeof(struct pt_regs));
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BLANK();
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/* stack_frame offsets */
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OFFSET(__SF_BACKCHAIN, stack_frame, back_chain);
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OFFSET(__SF_GPRS, stack_frame, gprs);
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OFFSET(__SF_EMPTY, stack_frame, empty1[0]);
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OFFSET(__SF_SIE_CONTROL, stack_frame, empty1[1]);
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OFFSET(__SF_SIE_SAVEAREA, stack_frame, empty1[2]);
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OFFSET(__SF_SIE_REASON, stack_frame, empty1[3]);
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OFFSET(__SF_SIE_FLAGS, stack_frame, empty1[4]);
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BLANK();
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/* idle data offsets */
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OFFSET(__CLOCK_IDLE_ENTER, s390_idle_data, clock_idle_enter);
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OFFSET(__CLOCK_IDLE_EXIT, s390_idle_data, clock_idle_exit);
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OFFSET(__TIMER_IDLE_ENTER, s390_idle_data, timer_idle_enter);
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OFFSET(__TIMER_IDLE_EXIT, s390_idle_data, timer_idle_exit);
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OFFSET(__MT_CYCLES_ENTER, s390_idle_data, mt_cycles_enter);
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BLANK();
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/* hardware defined lowcore locations 0x000 - 0x1ff */
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OFFSET(__LC_EXT_PARAMS, lowcore, ext_params);
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OFFSET(__LC_EXT_CPU_ADDR, lowcore, ext_cpu_addr);
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OFFSET(__LC_EXT_INT_CODE, lowcore, ext_int_code);
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OFFSET(__LC_SVC_ILC, lowcore, svc_ilc);
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OFFSET(__LC_SVC_INT_CODE, lowcore, svc_code);
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OFFSET(__LC_PGM_ILC, lowcore, pgm_ilc);
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OFFSET(__LC_PGM_INT_CODE, lowcore, pgm_code);
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OFFSET(__LC_DATA_EXC_CODE, lowcore, data_exc_code);
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OFFSET(__LC_MON_CLASS_NR, lowcore, mon_class_num);
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OFFSET(__LC_PER_CODE, lowcore, per_code);
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OFFSET(__LC_PER_ATMID, lowcore, per_atmid);
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OFFSET(__LC_PER_ADDRESS, lowcore, per_address);
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OFFSET(__LC_EXC_ACCESS_ID, lowcore, exc_access_id);
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OFFSET(__LC_PER_ACCESS_ID, lowcore, per_access_id);
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OFFSET(__LC_OP_ACCESS_ID, lowcore, op_access_id);
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OFFSET(__LC_AR_MODE_ID, lowcore, ar_mode_id);
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OFFSET(__LC_TRANS_EXC_CODE, lowcore, trans_exc_code);
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OFFSET(__LC_MON_CODE, lowcore, monitor_code);
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OFFSET(__LC_SUBCHANNEL_ID, lowcore, subchannel_id);
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OFFSET(__LC_SUBCHANNEL_NR, lowcore, subchannel_nr);
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OFFSET(__LC_IO_INT_PARM, lowcore, io_int_parm);
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OFFSET(__LC_IO_INT_WORD, lowcore, io_int_word);
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OFFSET(__LC_STFL_FAC_LIST, lowcore, stfl_fac_list);
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OFFSET(__LC_STFLE_FAC_LIST, lowcore, stfle_fac_list);
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OFFSET(__LC_MCCK_CODE, lowcore, mcck_interruption_code);
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OFFSET(__LC_EXT_DAMAGE_CODE, lowcore, external_damage_code);
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OFFSET(__LC_MCCK_FAIL_STOR_ADDR, lowcore, failing_storage_address);
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OFFSET(__LC_LAST_BREAK, lowcore, breaking_event_addr);
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OFFSET(__LC_RETURN_LPSWE, lowcore, return_lpswe);
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OFFSET(__LC_RETURN_MCCK_LPSWE, lowcore, return_mcck_lpswe);
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OFFSET(__LC_RST_OLD_PSW, lowcore, restart_old_psw);
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OFFSET(__LC_EXT_OLD_PSW, lowcore, external_old_psw);
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OFFSET(__LC_SVC_OLD_PSW, lowcore, svc_old_psw);
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OFFSET(__LC_PGM_OLD_PSW, lowcore, program_old_psw);
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OFFSET(__LC_MCK_OLD_PSW, lowcore, mcck_old_psw);
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OFFSET(__LC_IO_OLD_PSW, lowcore, io_old_psw);
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OFFSET(__LC_RST_NEW_PSW, lowcore, restart_psw);
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OFFSET(__LC_EXT_NEW_PSW, lowcore, external_new_psw);
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OFFSET(__LC_SVC_NEW_PSW, lowcore, svc_new_psw);
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OFFSET(__LC_PGM_NEW_PSW, lowcore, program_new_psw);
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OFFSET(__LC_MCK_NEW_PSW, lowcore, mcck_new_psw);
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OFFSET(__LC_IO_NEW_PSW, lowcore, io_new_psw);
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/* software defined lowcore locations 0x200 - 0xdff*/
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OFFSET(__LC_SAVE_AREA_SYNC, lowcore, save_area_sync);
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OFFSET(__LC_SAVE_AREA_ASYNC, lowcore, save_area_async);
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OFFSET(__LC_SAVE_AREA_RESTART, lowcore, save_area_restart);
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OFFSET(__LC_CPU_FLAGS, lowcore, cpu_flags);
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OFFSET(__LC_RETURN_PSW, lowcore, return_psw);
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OFFSET(__LC_RETURN_MCCK_PSW, lowcore, return_mcck_psw);
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OFFSET(__LC_SYS_ENTER_TIMER, lowcore, sys_enter_timer);
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OFFSET(__LC_MCCK_ENTER_TIMER, lowcore, mcck_enter_timer);
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OFFSET(__LC_EXIT_TIMER, lowcore, exit_timer);
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OFFSET(__LC_LAST_UPDATE_TIMER, lowcore, last_update_timer);
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OFFSET(__LC_LAST_UPDATE_CLOCK, lowcore, last_update_clock);
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OFFSET(__LC_INT_CLOCK, lowcore, int_clock);
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OFFSET(__LC_MCCK_CLOCK, lowcore, mcck_clock);
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OFFSET(__LC_CLOCK_COMPARATOR, lowcore, clock_comparator);
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OFFSET(__LC_BOOT_CLOCK, lowcore, boot_clock);
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OFFSET(__LC_CURRENT, lowcore, current_task);
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OFFSET(__LC_KERNEL_STACK, lowcore, kernel_stack);
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OFFSET(__LC_ASYNC_STACK, lowcore, async_stack);
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OFFSET(__LC_NODAT_STACK, lowcore, nodat_stack);
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OFFSET(__LC_RESTART_STACK, lowcore, restart_stack);
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OFFSET(__LC_MCCK_STACK, lowcore, mcck_stack);
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OFFSET(__LC_RESTART_FN, lowcore, restart_fn);
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OFFSET(__LC_RESTART_DATA, lowcore, restart_data);
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OFFSET(__LC_RESTART_SOURCE, lowcore, restart_source);
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OFFSET(__LC_KERNEL_ASCE, lowcore, kernel_asce);
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OFFSET(__LC_USER_ASCE, lowcore, user_asce);
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OFFSET(__LC_LPP, lowcore, lpp);
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OFFSET(__LC_CURRENT_PID, lowcore, current_pid);
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OFFSET(__LC_PERCPU_OFFSET, lowcore, percpu_offset);
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OFFSET(__LC_MACHINE_FLAGS, lowcore, machine_flags);
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OFFSET(__LC_PREEMPT_COUNT, lowcore, preempt_count);
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OFFSET(__LC_GMAP, lowcore, gmap);
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OFFSET(__LC_BR_R1, lowcore, br_r1_trampoline);
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/* software defined ABI-relevant lowcore locations 0xe00 - 0xe20 */
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OFFSET(__LC_DUMP_REIPL, lowcore, ipib);
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/* hardware defined lowcore locations 0x1000 - 0x18ff */
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OFFSET(__LC_MCESAD, lowcore, mcesad);
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OFFSET(__LC_EXT_PARAMS2, lowcore, ext_params2);
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OFFSET(__LC_FPREGS_SAVE_AREA, lowcore, floating_pt_save_area);
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OFFSET(__LC_GPREGS_SAVE_AREA, lowcore, gpregs_save_area);
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OFFSET(__LC_PSW_SAVE_AREA, lowcore, psw_save_area);
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OFFSET(__LC_PREFIX_SAVE_AREA, lowcore, prefixreg_save_area);
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OFFSET(__LC_FP_CREG_SAVE_AREA, lowcore, fpt_creg_save_area);
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OFFSET(__LC_TOD_PROGREG_SAVE_AREA, lowcore, tod_progreg_save_area);
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OFFSET(__LC_CPU_TIMER_SAVE_AREA, lowcore, cpu_timer_save_area);
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OFFSET(__LC_CLOCK_COMP_SAVE_AREA, lowcore, clock_comp_save_area);
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OFFSET(__LC_AREGS_SAVE_AREA, lowcore, access_regs_save_area);
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OFFSET(__LC_CREGS_SAVE_AREA, lowcore, cregs_save_area);
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OFFSET(__LC_PGM_TDB, lowcore, pgm_tdb);
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BLANK();
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/* extended machine check save area */
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OFFSET(__MCESA_GS_SAVE_AREA, mcesa, guarded_storage_save_area);
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BLANK();
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/* gmap/sie offsets */
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OFFSET(__GMAP_ASCE, gmap, asce);
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OFFSET(__SIE_PROG0C, kvm_s390_sie_block, prog0c);
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OFFSET(__SIE_PROG20, kvm_s390_sie_block, prog20);
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/* kexec_sha_region */
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OFFSET(__KEXEC_SHA_REGION_START, kexec_sha_region, start);
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OFFSET(__KEXEC_SHA_REGION_LEN, kexec_sha_region, len);
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DEFINE(__KEXEC_SHA_REGION_SIZE, sizeof(struct kexec_sha_region));
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return 0;
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}
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