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DIAGNOSE 0x318 (diag318) is an s390 instruction that allows the storage of diagnostic information that is collected by the firmware in the case of hardware/firmware service events. QEMU handles the instruction by storing the info in the CPU state. A subsequent register sync will communicate the data to the hypervisor. QEMU handles the migration via a VM State Description. This feature depends on the Extended-Length SCCB (els) feature. If els is not present, then a warning will be printed and the SCLP bit that allows the Linux kernel to execute the instruction will not be set. Availability of this instruction is determined by byte 134 (aka fac134) bit 0 of the SCLP Read Info block. This coincidentally expands into the space used for CPU entries, which means VMs running with the diag318 capability may not be able to read information regarding all CPUs unless the guest kernel supports an extended-length SCCB. This feature is not supported in protected virtualization mode. Signed-off-by: Collin Walling <walling@linux.ibm.com> Acked-by: Janosch Frank <frankja@linux.ibm.com> Acked-by: Thomas Huth <thuth@redhat.com> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Message-Id: <20200915194416.107460-9-walling@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/*
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* CPU features/facilities helper structs and utility functions for s390
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*
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* Copyright 2016 IBM Corp.
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*
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* Author(s): Michael Mueller <mimu@linux.vnet.ibm.com>
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* David Hildenbrand <dahi@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef TARGET_S390X_CPU_FEATURES_H
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#define TARGET_S390X_CPU_FEATURES_H
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#include "qemu/bitmap.h"
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#include "cpu_features_def.h"
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#include "target/s390x/gen-features.h"
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/* CPU features are announced via different ways */
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typedef enum {
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S390_FEAT_TYPE_STFL,
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S390_FEAT_TYPE_SCLP_CONF_CHAR,
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S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
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S390_FEAT_TYPE_SCLP_FAC134,
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S390_FEAT_TYPE_SCLP_CPU,
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S390_FEAT_TYPE_MISC,
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S390_FEAT_TYPE_PLO,
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S390_FEAT_TYPE_PTFF,
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S390_FEAT_TYPE_KMAC,
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S390_FEAT_TYPE_KMC,
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S390_FEAT_TYPE_KM,
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S390_FEAT_TYPE_KIMD,
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S390_FEAT_TYPE_KLMD,
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S390_FEAT_TYPE_PCKMO,
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S390_FEAT_TYPE_KMCTR,
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S390_FEAT_TYPE_KMF,
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S390_FEAT_TYPE_KMO,
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S390_FEAT_TYPE_PCC,
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S390_FEAT_TYPE_PPNO,
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S390_FEAT_TYPE_KMA,
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S390_FEAT_TYPE_KDSA,
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S390_FEAT_TYPE_SORTL,
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S390_FEAT_TYPE_DFLTCC,
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} S390FeatType;
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/* Definition of a CPU feature */
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typedef struct {
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const char *name; /* name exposed to the user */
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const char *desc; /* description exposed to the user */
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S390FeatType type; /* feature type (way of indication)*/
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int bit; /* bit within the feature type area (fixed) */
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} S390FeatDef;
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/* use ordinary bitmap operations to work with features */
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typedef unsigned long S390FeatBitmap[BITS_TO_LONGS(S390_FEAT_MAX)];
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/* 64bit based bitmap used to init S390FeatBitmap from generated data */
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typedef uint64_t S390FeatInit[S390_FEAT_MAX / 64 + 1];
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const S390FeatDef *s390_feat_def(S390Feat feat);
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S390Feat s390_feat_by_type_and_bit(S390FeatType type, int bit);
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void s390_init_feat_bitmap(const S390FeatInit init, S390FeatBitmap bitmap);
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void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
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uint8_t *data);
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void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type,
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uint8_t *data);
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void s390_feat_bitmap_to_ascii(const S390FeatBitmap features, void *opaque,
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void (*fn)(const char *name, void *opaque));
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/* Definition of a CPU feature group */
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typedef struct {
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const char *name; /* name exposed to the user */
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const char *desc; /* description exposed to the user */
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S390FeatBitmap feat; /* features contained in the group */
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S390FeatInit init; /* used to init feat from generated data */
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} S390FeatGroupDef;
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const S390FeatGroupDef *s390_feat_group_def(S390FeatGroup group);
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#define BE_BIT_NR(BIT) (BIT ^ (BITS_PER_LONG - 1))
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static inline void set_be_bit(unsigned int bit_nr, uint8_t *array)
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{
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array[bit_nr / 8] |= 0x80 >> (bit_nr % 8);
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}
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static inline bool test_be_bit(unsigned int bit_nr, const uint8_t *array)
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{
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return array[bit_nr / 8] & (0x80 >> (bit_nr % 8));
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}
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#endif /* TARGET_S390X_CPU_FEATURES_H */
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