Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'powerpc-4.17-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fix from Michael Ellerman:
"Just one fix, to make sure the PCR (Processor Compatibility Register)
is reset on boot.
Otherwise if we're running in compat mode in a guest (eg. pretending a
Power9 is a Power8) and the host kernel oopses and kdumps then the
kdump kernel's userspace will be running in Power8 mode, and will
SIGILL if it uses Power9-only instructions.
Thanks to Michael Neuling"
* tag 'powerpc-4.17-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/64s: Clear PCR on boot
+7
+6
arch/powerpc/kernel/cpu_setup_power.S
+6
arch/powerpc/kernel/cpu_setup_power.S
···
28
28
beqlr
29
29
li r0,0
30
30
mtspr SPRN_LPID,r0
31
+
mtspr SPRN_PCR,r0
31
32
mfspr r3,SPRN_LPCR
32
33
li r4,(LPCR_LPES1 >> LPCR_LPES_SH)
33
34
bl __init_LPCR_ISA206
···
42
41
beqlr
43
42
li r0,0
44
43
mtspr SPRN_LPID,r0
44
+
mtspr SPRN_PCR,r0
45
45
mfspr r3,SPRN_LPCR
46
46
li r4,(LPCR_LPES1 >> LPCR_LPES_SH)
47
47
bl __init_LPCR_ISA206
···
59
57
beqlr
60
58
li r0,0
61
59
mtspr SPRN_LPID,r0
60
+
mtspr SPRN_PCR,r0
62
61
mfspr r3,SPRN_LPCR
63
62
ori r3, r3, LPCR_PECEDH
64
63
li r4,0 /* LPES = 0 */
···
81
78
beqlr
82
79
li r0,0
83
80
mtspr SPRN_LPID,r0
81
+
mtspr SPRN_PCR,r0
84
82
mfspr r3,SPRN_LPCR
85
83
ori r3, r3, LPCR_PECEDH
86
84
li r4,0 /* LPES = 0 */
···
103
99
mtspr SPRN_PSSCR,r0
104
100
mtspr SPRN_LPID,r0
105
101
mtspr SPRN_PID,r0
102
+
mtspr SPRN_PCR,r0
106
103
mfspr r3,SPRN_LPCR
107
104
LOAD_REG_IMMEDIATE(r4, LPCR_PECEDH | LPCR_PECE_HVEE | LPCR_HVICE | LPCR_HEIC)
108
105
or r3, r3, r4
···
128
123
mtspr SPRN_PSSCR,r0
129
124
mtspr SPRN_LPID,r0
130
125
mtspr SPRN_PID,r0
126
+
mtspr SPRN_PCR,r0
131
127
mfspr r3,SPRN_LPCR
132
128
LOAD_REG_IMMEDIATE(r4, LPCR_PECEDH | LPCR_PECE_HVEE | LPCR_HVICE | LPCR_HEIC)
133
129
or r3, r3, r4