mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Heiko CarstensandAlexander Gordeev
37540b8c28
load_unaligned_zeropad() reads eight bytes from unaligned addresses and may cross page boundaries. It handles exceptions which may happen if reading from the second page results in an exception. For pages which are donated to the Ultravisor for secure execution purposes the do_secure_storage_access() exception handler however does not handle such exceptions correctly. Such an exception may result in an endless exception loop which will never be resolved. An attempt to fix this [1] turned out to be not sufficient. For now revert load_unaligned_zeropad() until this problem has been resolved in a proper way. Note that the implementation of load_unaligned_zeropad() itself is correct. The revert is just a temporary workaround until there is complete fix for secure storage access exceptions. [1] commitb00be77302("s390/mm: Add missing secure storage access fixups for donated memory") Fixes:802ba53eef("s390: add support for DCACHE_WORD_ACCESS") Cc: stable@vger.kernel.org Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
92 lines
3.5 KiB
C
92 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_EXTABLE_H
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#define __ASM_EXTABLE_H
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#include <linux/stringify.h>
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#include <linux/bits.h>
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#include <asm/asm-const.h>
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#define EX_TYPE_NONE 0
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#define EX_TYPE_FIXUP 1
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#define EX_TYPE_BPF 2
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#define EX_TYPE_UA_FAULT 3
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#define EX_TYPE_UA_LOAD_REG 5
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#define EX_TYPE_UA_LOAD_REGPAIR 6
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#define EX_TYPE_FPC 8
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#define EX_TYPE_UA_MVCOS_TO 9
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#define EX_TYPE_UA_MVCOS_FROM 10
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#define EX_DATA_REG_ERR_SHIFT 0
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#define EX_DATA_REG_ERR GENMASK(3, 0)
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#define EX_DATA_REG_ADDR_SHIFT 4
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#define EX_DATA_REG_ADDR GENMASK(7, 4)
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#define EX_DATA_LEN_SHIFT 8
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#define EX_DATA_LEN GENMASK(11, 8)
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#define __EX_TABLE(_section, _fault, _target, _type, _regerr, _regaddr, _len) \
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stringify_in_c(.section _section,"a";) \
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stringify_in_c(.balign 4;) \
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stringify_in_c(.long (_fault) - .;) \
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stringify_in_c(.long (_target) - .;) \
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stringify_in_c(.short (_type);) \
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stringify_in_c(.macro extable_reg regerr, regaddr;) \
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stringify_in_c(.set .Lfound, 0;) \
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stringify_in_c(.set .Lcurr, 0;) \
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stringify_in_c(.irp rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;) \
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stringify_in_c( .ifc "\regerr", "%%r\rs";) \
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stringify_in_c( .set .Lfound, 1;) \
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stringify_in_c( .set .Lregerr, .Lcurr;) \
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stringify_in_c( .endif;) \
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stringify_in_c( .set .Lcurr, .Lcurr+1;) \
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stringify_in_c(.endr;) \
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stringify_in_c(.ifne (.Lfound != 1);) \
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stringify_in_c( .error "extable_reg: bad register argument1";) \
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stringify_in_c(.endif;) \
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stringify_in_c(.set .Lfound, 0;) \
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stringify_in_c(.set .Lcurr, 0;) \
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stringify_in_c(.irp rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;) \
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stringify_in_c( .ifc "\regaddr", "%%r\rs";) \
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stringify_in_c( .set .Lfound, 1;) \
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stringify_in_c( .set .Lregaddr, .Lcurr;) \
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stringify_in_c( .endif;) \
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stringify_in_c( .set .Lcurr, .Lcurr+1;) \
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stringify_in_c(.endr;) \
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stringify_in_c(.ifne (.Lfound != 1);) \
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stringify_in_c( .error "extable_reg: bad register argument2";) \
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stringify_in_c(.endif;) \
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stringify_in_c(.short .Lregerr << EX_DATA_REG_ERR_SHIFT | \
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.Lregaddr << EX_DATA_REG_ADDR_SHIFT | \
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_len << EX_DATA_LEN_SHIFT;) \
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stringify_in_c(.endm;) \
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stringify_in_c(extable_reg _regerr,_regaddr;) \
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stringify_in_c(.purgem extable_reg;) \
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stringify_in_c(.previous)
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#define EX_TABLE(_fault, _target) \
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__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FIXUP, __stringify(%%r0), __stringify(%%r0), 0)
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#define EX_TABLE_AMODE31(_fault, _target) \
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__EX_TABLE(.amode31.ex_table, _fault, _target, EX_TYPE_FIXUP, __stringify(%%r0), __stringify(%%r0), 0)
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#define EX_TABLE_UA_FAULT(_fault, _target, _regerr) \
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__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_FAULT, _regerr, _regerr, 0)
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#define EX_TABLE_UA_LOAD_REG(_fault, _target, _regerr, _regzero) \
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__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REG, _regerr, _regzero, 0)
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#define EX_TABLE_UA_LOAD_REGPAIR(_fault, _target, _regerr, _regzero) \
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__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REGPAIR, _regerr, _regzero, 0)
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#define EX_TABLE_FPC(_fault, _target) \
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__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FPC, __stringify(%%r0), __stringify(%%r0), 0)
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#define EX_TABLE_UA_MVCOS_TO(_fault, _target) \
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__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_MVCOS_TO, __stringify(%%r0), __stringify(%%r0), 0)
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#define EX_TABLE_UA_MVCOS_FROM(_fault, _target) \
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__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_MVCOS_FROM, __stringify(%%r0), __stringify(%%r0), 0)
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#endif /* __ASM_EXTABLE_H */
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