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s390x/ioinst: Rework memory access in STCRW instruction

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Change the handler for STCRW to use the new logical memory access
functions. Since STCRW is suppressed on protection/access exceptions,
we also have to make sure to re-queue the CRW in case it could not be
written to the memory.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Thomas Huth 2015-02-12 18:09:38 +01:00 committed by Christian Borntraeger
parent b7b6348ab4
commit 7f74f0aa74
3 changed files with 31 additions and 12 deletions
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20
hw/s390x/css.c
View File

@ -955,6 +955,26 @@ int css_do_stcrw(CRW *crw)
return ret;
}
static void copy_crw_from_guest(CRW *dest, const CRW *src)
{
dest->flags = be16_to_cpu(src->flags);
dest->rsid = be16_to_cpu(src->rsid);
}
void css_undo_stcrw(CRW *crw)
{
CrwContainer *crw_cont;
crw_cont = g_try_malloc0(sizeof(CrwContainer));
if (!crw_cont) {
channel_subsys->crws_lost = true;
return;
}
copy_crw_from_guest(&crw_cont->crw, crw);
QTAILQ_INSERT_HEAD(&channel_subsys->pending_crws, crw_cont, sibling);
}
int css_do_tpi(IOIntCode *int_code, int lowcore)
{
/* No pending interrupts for !KVM. */

1
target-s390x/cpu.h
View File

@ -458,6 +458,7 @@ int css_do_ssch(SubchDev *sch, ORB *orb);
int css_do_tsch_get_irb(SubchDev *sch, IRB *irb, int *irb_len);
void css_do_tsch_update_subch(SubchDev *sch);
int css_do_stcrw(CRW *crw);
void css_undo_stcrw(CRW *crw);
int css_do_tpi(IOIntCode *int_code, int lowcore);
int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid,
int rfmt, void *buf);

22
target-s390x/ioinst.c
View File

@ -254,10 +254,9 @@ void ioinst_handle_ssch(S390CPU *cpu, uint64_t reg1, uint32_t ipb)
void ioinst_handle_stcrw(S390CPU *cpu, uint32_t ipb)
{
CRW *crw;
CRW crw;
uint64_t addr;
int cc;
hwaddr len = sizeof(*crw);
CPUS390XState *env = &cpu->env;
addr = decode_basedisp_s(env, ipb);
@ -265,17 +264,16 @@ void ioinst_handle_stcrw(S390CPU *cpu, uint32_t ipb)
program_interrupt(env, PGM_SPECIFICATION, 2);
return;
}
crw = s390_cpu_physical_memory_map(env, addr, &len, 1);
if (!crw || len != sizeof(*crw)) {
program_interrupt(env, PGM_ADDRESSING, 2);
goto out;
}
cc = css_do_stcrw(crw);
/* 0 - crw stored, 1 - zeroes stored */
setcc(cpu, cc);
out:
s390_cpu_physical_memory_unmap(env, crw, len, 1);
cc = css_do_stcrw(&crw);
/* 0 - crw stored, 1 - zeroes stored */
if (s390_cpu_virt_mem_write(cpu, addr, &crw, sizeof(crw)) == 0) {
setcc(cpu, cc);
} else if (cc == 0) {
/* Write failed: requeue CRW since STCRW is a suppressing instruction */
css_undo_stcrw(&crw);
}
}
void ioinst_handle_stsch(S390CPU *cpu, uint64_t reg1, uint32_t ipb)