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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>
This commit is contained in:
Alexander Egorenkov 2021-09-03 11:08:48 +02:00 committed by Heiko Carstens
parent 1b553839e1
commit 2ba24343bd
3 changed files with 16 additions and 3 deletions
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6
arch/s390/include/asm/ipl.h
View File

@ -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,

10
arch/s390/kernel/machine_kexec.c
View File

@ -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();

3
arch/s390/kernel/relocate_kernel.S
View File

@ -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