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s390/ipl: fix physical-virtual confusion for diag308 

Diag 308 subcodes expect a physical address as their parameter.

This currently is not a bug, but in the future physical and virtual
addresses might differ.

Fix the confusion by doing a virtual-to-physical conversion in the
exported diag308() and leave the assembly wrapper __diag308() alone.

Note that several callers pass NULL as addr, so check for the case when
NULL is passed and pass 0 to hardware since virt_to_phys(0) might be
nonzero.

Suggested-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Nico Boehr 2023-03-10 12:52:37 +01:00 committed by Vasily Gorbik
parent 34644cc2e1
commit bac30ea9ef
1 changed files with 3 additions and 3 deletions
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6
arch/s390/kernel/ipl.c
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@ -176,11 +176,11 @@ static bool reipl_fcp_clear;
static bool reipl_ccw_clear;
static bool reipl_eckd_clear;
static inline int __diag308(unsigned long subcode, void *addr)
static inline int __diag308(unsigned long subcode, unsigned long addr)
{
union register_pair r1;
r1.even = (unsigned long) addr;
r1.even = addr;
r1.odd = 0;
asm volatile(
" diag %[r1],%[subcode],0x308\n"
@ -195,7 +195,7 @@ static inline int __diag308(unsigned long subcode, void *addr)
int diag308(unsigned long subcode, void *addr)
{
diag_stat_inc(DIAG_STAT_X308);
return __diag308(subcode, addr);
return __diag308(subcode, addr ? virt_to_phys(addr) : 0);
}
EXPORT_SYMBOL_GPL(diag308);