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s390x/tcg: implement TEST PENDING INTERRUPTION

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Use s390_cpu_virt_mem_write() so we can actually revert what we did
(re-inject the dequeued IO interrupt).

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180129125623.21729-10-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2018-01-29 13:56:14 +01:00 committed by Cornelia Huck
parent b194e44785
commit 6a253de395
4 changed files with 64 additions and 0 deletions
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1
target/s390x/helper.h
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@ -170,6 +170,7 @@ DEF_HELPER_4(schm, void, env, i64, i64, i64)
DEF_HELPER_3(ssch, void, env, i64, i64)
DEF_HELPER_2(stcrw, void, env, i64)
DEF_HELPER_3(stsch, void, env, i64, i64)
DEF_HELPER_2(tpi, i32, env, i64)
DEF_HELPER_3(tsch, void, env, i64, i64)
DEF_HELPER_2(chsc, void, env, i64)
#endif

1
target/s390x/insn-data.def
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@ -1063,6 +1063,7 @@
C(0xb233, SSCH, S, Z, 0, insn, 0, 0, ssch, 0)
C(0xb239, STCRW, S, Z, 0, insn, 0, 0, stcrw, 0)
C(0xb234, STSCH, S, Z, 0, insn, 0, 0, stsch, 0)
C(0xb236, TPI , S, Z, la2, 0, 0, 0, tpi, 0)
C(0xb235, TSCH, S, Z, 0, insn, 0, 0, tsch, 0)
/* ??? Not listed in PoO ninth edition, but there's a linux driver that
uses it: "A CHSC subchannel is usually present on LPAR only." */

54
target/s390x/misc_helper.c
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@ -36,6 +36,7 @@
#include "hw/s390x/ebcdic.h"
#include "hw/s390x/s390-virtio-hcall.h"
#include "hw/s390x/sclp.h"
#include "hw/s390x/s390_flic.h"
#endif
/* #define DEBUG_HELPER */
@ -429,6 +430,59 @@ void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
qemu_mutex_unlock_iothread();
}
uint32_t HELPER(tpi)(CPUS390XState *env, uint64_t addr)
{
const uintptr_t ra = GETPC();
S390CPU *cpu = s390_env_get_cpu(env);
QEMUS390FLICState *flic = QEMU_S390_FLIC(s390_get_flic());
QEMUS390FlicIO *io = NULL;
LowCore *lowcore;
if (addr & 0x3) {
s390_program_interrupt(env, PGM_SPECIFICATION, 4, ra);
}
qemu_mutex_lock_iothread();
io = qemu_s390_flic_dequeue_io(flic, env->cregs[6]);
if (!io) {
qemu_mutex_unlock_iothread();
return 0;
}
if (addr) {
struct {
uint16_t id;
uint16_t nr;
uint32_t parm;
} intc = {
.id = cpu_to_be16(io->id),
.nr = cpu_to_be16(io->nr),
.parm = cpu_to_be32(io->parm),
};
if (s390_cpu_virt_mem_write(cpu, addr, 0, &intc, sizeof(intc))) {
/* writing failed, reinject and properly clean up */
s390_io_interrupt(io->id, io->nr, io->parm, io->word);
qemu_mutex_unlock_iothread();
g_free(io);
s390_cpu_virt_mem_handle_exc(cpu, ra);
return 0;
}
} else {
/* no protection applies */
lowcore = cpu_map_lowcore(env);
lowcore->subchannel_id = cpu_to_be16(io->id);
lowcore->subchannel_nr = cpu_to_be16(io->nr);
lowcore->io_int_parm = cpu_to_be32(io->parm);
lowcore->io_int_word = cpu_to_be32(io->word);
cpu_unmap_lowcore(lowcore);
}
g_free(io);
qemu_mutex_unlock_iothread();
return 1;
}
void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
{
S390CPU *cpu = s390_env_get_cpu(env);

8
target/s390x/translate.c
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@ -4199,6 +4199,14 @@ static ExitStatus op_stcrw(DisasContext *s, DisasOps *o)
return NO_EXIT;
}
static ExitStatus op_tpi(DisasContext *s, DisasOps *o)
{
check_privileged(s);
gen_helper_tpi(cc_op, cpu_env, o->addr1);
set_cc_static(s);
return NO_EXIT;
}
static ExitStatus op_tsch(DisasContext *s, DisasOps *o)
{
check_privileged(s);