Skip to content
Navigation Menu
Toggle navigation
Sign in
In this repository
All GitHub Enterprise
↵
Jump to
↵
No suggested jump to results
In this repository
All GitHub Enterprise
↵
Jump to
↵
In this organization
All GitHub Enterprise
↵
Jump to
↵
In this repository
All GitHub Enterprise
↵
Jump to
↵
Sign in
Reseting focus
You signed in with another tab or window.
Reload
to refresh your session.
You signed out in another tab or window.
Reload
to refresh your session.
You switched accounts on another tab or window.
Reload
to refresh your session.
Dismiss alert
{{ message }}
mariux64
/
linux
Public
Notifications
You must be signed in to change notification settings
Fork
0
Star
0
Code
Issues
2
Pull requests
0
Actions
Projects
0
Wiki
Security
Insights
Additional navigation options
Code
Issues
Pull requests
Actions
Projects
Wiki
Security
Insights
Files
d29899a
Documentation
arch
alpha
arc
arm
arm64
blackfin
c6x
cris
frv
h8300
hexagon
ia64
m32r
m68k
metag
microblaze
mips
mn10300
nios2
openrisc
parisc
powerpc
riscv
s390
appldata
boot
configs
crypto
hypfs
include
kernel
kvm
Kconfig
Makefile
diag.c
gaccess.c
gaccess.h
guestdbg.c
intercept.c
interrupt.c
irq.h
kvm-s390.c
kvm-s390.h
priv.c
sigp.c
trace-s390.h
trace.h
vsie.c
lib
mm
net
numa
oprofile
pci
tools
Kbuild
Kconfig
Kconfig.debug
Makefile
defconfig
score
sh
sparc
tile
um
unicore32
x86
xtensa
.gitignore
Kconfig
block
certs
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile
README
Breadcrumbs
linux
/
arch
/
s390
/
kvm
/
diag.c
Blame
Blame
Latest commit
History
History
262 lines (231 loc) · 7.48 KB
Breadcrumbs
linux
/
arch
/
s390
/
kvm
/
diag.c
Top
File metadata and controls
Code
Blame
262 lines (231 loc) · 7.48 KB
Raw
// SPDX-License-Identifier: GPL-2.0 /* * handling diagnose instructions * * Copyright IBM Corp. 2008, 2011 * * Author(s): Carsten Otte <cotte@de.ibm.com> * Christian Borntraeger <borntraeger@de.ibm.com> */ #include <linux/kvm.h> #include <linux/kvm_host.h> #include <asm/pgalloc.h> #include <asm/gmap.h> #include <asm/virtio-ccw.h> #include "kvm-s390.h" #include "trace.h" #include "trace-s390.h" #include "gaccess.h" static int diag_release_pages(struct kvm_vcpu *vcpu) { unsigned long start, end; unsigned long prefix = kvm_s390_get_prefix(vcpu); start = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4]; end = vcpu->run->s.regs.gprs[vcpu->arch.sie_block->ipa & 0xf] + PAGE_SIZE; vcpu->stat.diagnose_10++; if (start & ~PAGE_MASK || end & ~PAGE_MASK || start >= end || start < 2 * PAGE_SIZE) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); VCPU_EVENT(vcpu, 5, "diag release pages %lX %lX", start, end); /* * We checked for start >= end above, so lets check for the * fast path (no prefix swap page involved) */ if (end <= prefix || start >= prefix + 2 * PAGE_SIZE) { gmap_discard(vcpu->arch.gmap, start, end); } else { /* * This is slow path. gmap_discard will check for start * so lets split this into before prefix, prefix, after * prefix and let gmap_discard make some of these calls * NOPs. */ gmap_discard(vcpu->arch.gmap, start, prefix); if (start <= prefix) gmap_discard(vcpu->arch.gmap, 0, PAGE_SIZE); if (end > prefix + PAGE_SIZE) gmap_discard(vcpu->arch.gmap, PAGE_SIZE, 2 * PAGE_SIZE); gmap_discard(vcpu->arch.gmap, prefix + 2 * PAGE_SIZE, end); } return 0; } static int __diag_page_ref_service(struct kvm_vcpu *vcpu) { struct prs_parm { u16 code; u16 subcode; u16 parm_len; u16 parm_version; u64 token_addr; u64 select_mask; u64 compare_mask; u64 zarch; }; struct prs_parm parm; int rc; u16 rx = (vcpu->arch.sie_block->ipa & 0xf0) >> 4; u16 ry = (vcpu->arch.sie_block->ipa & 0x0f); VCPU_EVENT(vcpu, 3, "diag page reference parameter block at 0x%llx", vcpu->run->s.regs.gprs[rx]); vcpu->stat.diagnose_258++; if (vcpu->run->s.regs.gprs[rx] & 7) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); rc = read_guest(vcpu, vcpu->run->s.regs.gprs[rx], rx, &parm, sizeof(parm)); if (rc) return kvm_s390_inject_prog_cond(vcpu, rc); if (parm.parm_version != 2 || parm.parm_len < 5 || parm.code != 0x258) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); switch (parm.subcode) { case 0: /* TOKEN */ VCPU_EVENT(vcpu, 3, "pageref token addr 0x%llx " "select mask 0x%llx compare mask 0x%llx", parm.token_addr, parm.select_mask, parm.compare_mask); if (vcpu->arch.pfault_token != KVM_S390_PFAULT_TOKEN_INVALID) { /* * If the pagefault handshake is already activated, * the token must not be changed. We have to return * decimal 8 instead, as mandated in SC24-6084. */ vcpu->run->s.regs.gprs[ry] = 8; return 0; } if ((parm.compare_mask & parm.select_mask) != parm.compare_mask || parm.token_addr & 7 || parm.zarch != 0x8000000000000000ULL) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); if (kvm_is_error_gpa(vcpu->kvm, parm.token_addr)) return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); vcpu->arch.pfault_token = parm.token_addr; vcpu->arch.pfault_select = parm.select_mask; vcpu->arch.pfault_compare = parm.compare_mask; vcpu->run->s.regs.gprs[ry] = 0; rc = 0; break; case 1: /* * CANCEL * Specification allows to let already pending tokens survive * the cancel, therefore to reduce code complexity, we assume * all outstanding tokens are already pending. */ VCPU_EVENT(vcpu, 3, "pageref cancel addr 0x%llx", parm.token_addr); if (parm.token_addr || parm.select_mask || parm.compare_mask || parm.zarch) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); vcpu->run->s.regs.gprs[ry] = 0; /* * If the pfault handling was not established or is already * canceled SC24-6084 requests to return decimal 4. */ if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) vcpu->run->s.regs.gprs[ry] = 4; else vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; rc = 0; break; default: rc = -EOPNOTSUPP; break; } return rc; } static int __diag_time_slice_end(struct kvm_vcpu *vcpu) { VCPU_EVENT(vcpu, 5, "%s", "diag time slice end"); vcpu->stat.diagnose_44++; kvm_vcpu_on_spin(vcpu, true); return 0; } static int __diag_time_slice_end_directed(struct kvm_vcpu *vcpu) { struct kvm_vcpu *tcpu; int tid; tid = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4]; vcpu->stat.diagnose_9c++; VCPU_EVENT(vcpu, 5, "diag time slice end directed to %d", tid); if (tid == vcpu->vcpu_id) return 0; tcpu = kvm_get_vcpu_by_id(vcpu->kvm, tid); if (tcpu) kvm_vcpu_yield_to(tcpu); return 0; } static int __diag_ipl_functions(struct kvm_vcpu *vcpu) { unsigned int reg = vcpu->arch.sie_block->ipa & 0xf; unsigned long subcode = vcpu->run->s.regs.gprs[reg] & 0xffff; VCPU_EVENT(vcpu, 3, "diag ipl functions, subcode %lx", subcode); vcpu->stat.diagnose_308++; switch (subcode) { case 3: vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR; break; case 4: vcpu->run->s390_reset_flags = 0; break; default: return -EOPNOTSUPP; } if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) kvm_s390_vcpu_stop(vcpu); vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM; vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL; vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT; vcpu->run->exit_reason = KVM_EXIT_S390_RESET; VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx", vcpu->run->s390_reset_flags); trace_kvm_s390_request_resets(vcpu->run->s390_reset_flags); return -EREMOTE; } static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu) { int ret; vcpu->stat.diagnose_500++; /* No virtio-ccw notification? Get out quickly. */ if (!vcpu->kvm->arch.css_support || (vcpu->run->s.regs.gprs[1] != KVM_S390_VIRTIO_CCW_NOTIFY)) return -EOPNOTSUPP; VCPU_EVENT(vcpu, 4, "diag 0x500 schid 0x%8.8x queue 0x%x cookie 0x%llx", (u32) vcpu->run->s.regs.gprs[2], (u32) vcpu->run->s.regs.gprs[3], vcpu->run->s.regs.gprs[4]); /* * The layout is as follows: * - gpr 2 contains the subchannel id (passed as addr) * - gpr 3 contains the virtqueue index (passed as datamatch) * - gpr 4 contains the index on the bus (optionally) */ ret = kvm_io_bus_write_cookie(vcpu, KVM_VIRTIO_CCW_NOTIFY_BUS, vcpu->run->s.regs.gprs[2] & 0xffffffff, 8, &vcpu->run->s.regs.gprs[3], vcpu->run->s.regs.gprs[4]); /* * Return cookie in gpr 2, but don't overwrite the register if the * diagnose will be handled by userspace. */ if (ret != -EOPNOTSUPP) vcpu->run->s.regs.gprs[2] = ret; /* kvm_io_bus_write_cookie returns -EOPNOTSUPP if it found no match. */ return ret < 0 ? ret : 0; } int kvm_s390_handle_diag(struct kvm_vcpu *vcpu) { int code = kvm_s390_get_base_disp_rs(vcpu, NULL) & 0xffff; if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); trace_kvm_s390_handle_diag(vcpu, code); switch (code) { case 0x10: return diag_release_pages(vcpu); case 0x44: return __diag_time_slice_end(vcpu); case 0x9c: return __diag_time_slice_end_directed(vcpu); case 0x258: return __diag_page_ref_service(vcpu); case 0x308: return __diag_ipl_functions(vcpu); case 0x500: return __diag_virtio_hypercall(vcpu); default: return -EOPNOTSUPP; } }
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
You can’t perform that action at this time.