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| author | Alexander Egorenkov <egorenar@linux.ibm.com> | 2021-09-03 12:08:48 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2022-04-25 14:54:12 +0300 |
| commit | 2ba24343bdb8637135bd0d9b5e249c44bd751670 (patch) | |
| tree | a2ab5eb17592f217dc2e23bf47b5eeeb54bcd564 | |
| parent | 1b553839e1326b6a73431e399f575862696be51b (diff) | |
| download | linux-2ba24343bdb8637135bd0d9b5e249c44bd751670.tar.xz | |
s390/kexec: set end-of-ipl flag in last diag308 call
If the facility IPL-complete-control is present then the last diag308
call made by kexec shall set the end-of-ipl flag in the subcode register
to signal the hypervisor that this is the last diag308 call made by Linux.
Only the diag308 calls made during a regular kexec need to set
the end-of-ipl flag, in all other cases the hypervisor will ignore it.
Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| -rw-r--r-- | arch/s390/include/asm/ipl.h | 6 | ||||
| -rw-r--r-- | arch/s390/kernel/machine_kexec.c | 10 | ||||
| -rw-r--r-- | arch/s390/kernel/relocate_kernel.S | 3 |
3 files changed, 16 insertions, 3 deletions
diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h index 3f8ee257f9aa..a405b6bb89fb 100644 --- a/arch/s390/include/asm/ipl.h +++ b/arch/s390/include/asm/ipl.h @@ -133,6 +133,8 @@ int ipl_report_add_certificate(struct ipl_report *report, void *key, * DIAG 308 support */ enum diag308_subcode { + DIAG308_CLEAR_RESET = 0, + DIAG308_LOAD_NORMAL_RESET = 1, DIAG308_REL_HSA = 2, DIAG308_LOAD_CLEAR = 3, DIAG308_LOAD_NORMAL_DUMP = 4, @@ -141,6 +143,10 @@ enum diag308_subcode { DIAG308_LOAD_NORMAL = 7, }; +enum diag308_subcode_flags { + DIAG308_FLAG_EI = 1UL << 16, +}; + enum diag308_rc { DIAG308_RC_OK = 0x0001, DIAG308_RC_NOCONFIG = 0x0102, diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c index 6ebf02e15c85..ab761c008f98 100644 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -26,8 +26,10 @@ #include <asm/stacktrace.h> #include <asm/switch_to.h> #include <asm/nmi.h> +#include <asm/sclp.h> -typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long); +typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long, + unsigned long); extern const unsigned char relocate_kernel[]; extern const unsigned long long relocate_kernel_len; @@ -243,6 +245,7 @@ void machine_crash_shutdown(struct pt_regs *regs) */ static void __do_machine_kexec(void *data) { + unsigned long diag308_subcode; relocate_kernel_t data_mover; struct kimage *image = data; @@ -251,7 +254,10 @@ static void __do_machine_kexec(void *data) __arch_local_irq_stnsm(0xfb); /* disable DAT - avoid no-execute */ /* Call the moving routine */ - (*data_mover)(&image->head, image->start); + diag308_subcode = DIAG308_CLEAR_RESET; + if (sclp.has_iplcc) + diag308_subcode |= DIAG308_FLAG_EI; + (*data_mover)(&image->head, image->start, diag308_subcode); /* Die if kexec returns */ disabled_wait(); diff --git a/arch/s390/kernel/relocate_kernel.S b/arch/s390/kernel/relocate_kernel.S index 9438368c3632..a9a1a6f45375 100644 --- a/arch/s390/kernel/relocate_kernel.S +++ b/arch/s390/kernel/relocate_kernel.S @@ -14,6 +14,7 @@ * moves the new kernel to its destination... * %r2 = pointer to first kimage_entry_t * %r3 = start address - where to jump to after the job is done... + * %r4 = subcode * * %r5 will be used as temp. storage * %r6 holds the destination address @@ -56,7 +57,7 @@ ENTRY(relocate_kernel) jo 0b j .base .done: - sgr %r0,%r0 # clear register r0 + lgr %r0,%r4 # subcode cghi %r3,0 je .diag la %r4,load_psw-.base(%r13) # load psw-address into the register |