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qemu/target/s390x/machine.c
Collin Walling fabdada935 s390: guest support for diagnose 0x318 
DIAGNOSE 0x318 (diag318) is an s390 instruction that allows the storage
of diagnostic information that is collected by the firmware in the case
of hardware/firmware service events.

QEMU handles the instruction by storing the info in the CPU state. A
subsequent register sync will communicate the data to the hypervisor.

QEMU handles the migration via a VM State Description.

This feature depends on the Extended-Length SCCB (els) feature. If
els is not present, then a warning will be printed and the SCLP bit
that allows the Linux kernel to execute the instruction will not be
set.

Availability of this instruction is determined by byte 134 (aka fac134)
bit 0 of the SCLP Read Info block. This coincidentally expands into the
space used for CPU entries, which means VMs running with the diag318
capability may not be able to read information regarding all CPUs
unless the guest kernel supports an extended-length SCCB.

This feature is not supported in protected virtualization mode.

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-Id: <20200915194416.107460-9-walling@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
2020-10-02 13:52:49 +02:00

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/*
* S390x machine definitions and functions
*
* Copyright IBM Corp. 2014, 2018
*
* Authors:
* Thomas Huth <thuth@linux.vnet.ibm.com>
* Christian Borntraeger <borntraeger@de.ibm.com>
* Jason J. Herne <jjherne@us.ibm.com>
*
* This work is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "internal.h"
#include "kvm_s390x.h"
#include "migration/vmstate.h"
#include "tcg_s390x.h"
#include "sysemu/kvm.h"
#include "sysemu/tcg.h"
static int cpu_post_load(void *opaque, int version_id)
{
S390CPU *cpu = opaque;
/*
* As the cpu state is pushed to kvm via kvm_set_mp_state rather
* than via cpu_synchronize_state, we need update kvm here.
*/
if (kvm_enabled()) {
kvm_s390_set_cpu_state(cpu, cpu->env.cpu_state);
return kvm_s390_vcpu_interrupt_post_load(cpu);
}
if (tcg_enabled()) {
/* Rearm the CKC timer if necessary */
tcg_s390_tod_updated(CPU(cpu), RUN_ON_CPU_NULL);
}
return 0;
}
static int cpu_pre_save(void *opaque)
{
S390CPU *cpu = opaque;
if (kvm_enabled()) {
kvm_s390_vcpu_interrupt_pre_save(cpu);
}
return 0;
}
static inline bool fpu_needed(void *opaque)
{
/* This looks odd, but we might want to NOT transfer fprs in the future */
return true;
}
static const VMStateDescription vmstate_fpu = {
.name = "cpu/fpu",
.version_id = 1,
.minimum_version_id = 1,
.needed = fpu_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64(env.vregs[0][0], S390CPU),
VMSTATE_UINT64(env.vregs[1][0], S390CPU),
VMSTATE_UINT64(env.vregs[2][0], S390CPU),
VMSTATE_UINT64(env.vregs[3][0], S390CPU),
VMSTATE_UINT64(env.vregs[4][0], S390CPU),
VMSTATE_UINT64(env.vregs[5][0], S390CPU),
VMSTATE_UINT64(env.vregs[6][0], S390CPU),
VMSTATE_UINT64(env.vregs[7][0], S390CPU),
VMSTATE_UINT64(env.vregs[8][0], S390CPU),
VMSTATE_UINT64(env.vregs[9][0], S390CPU),
VMSTATE_UINT64(env.vregs[10][0], S390CPU),
VMSTATE_UINT64(env.vregs[11][0], S390CPU),
VMSTATE_UINT64(env.vregs[12][0], S390CPU),
VMSTATE_UINT64(env.vregs[13][0], S390CPU),
VMSTATE_UINT64(env.vregs[14][0], S390CPU),
VMSTATE_UINT64(env.vregs[15][0], S390CPU),
VMSTATE_UINT32(env.fpc, S390CPU),
VMSTATE_END_OF_LIST()
}
};
static bool vregs_needed(void *opaque)
{
return s390_has_feat(S390_FEAT_VECTOR);
}
static const VMStateDescription vmstate_vregs = {
.name = "cpu/vregs",
.version_id = 1,
.minimum_version_id = 1,
.needed = vregs_needed,
.fields = (VMStateField[]) {
/* vregs[0][0] -> vregs[15][0] and fregs are overlays */
VMSTATE_UINT64(env.vregs[16][0], S390CPU),
VMSTATE_UINT64(env.vregs[17][0], S390CPU),
VMSTATE_UINT64(env.vregs[18][0], S390CPU),
VMSTATE_UINT64(env.vregs[19][0], S390CPU),
VMSTATE_UINT64(env.vregs[20][0], S390CPU),
VMSTATE_UINT64(env.vregs[21][0], S390CPU),
VMSTATE_UINT64(env.vregs[22][0], S390CPU),
VMSTATE_UINT64(env.vregs[23][0], S390CPU),
VMSTATE_UINT64(env.vregs[24][0], S390CPU),
VMSTATE_UINT64(env.vregs[25][0], S390CPU),
VMSTATE_UINT64(env.vregs[26][0], S390CPU),
VMSTATE_UINT64(env.vregs[27][0], S390CPU),
VMSTATE_UINT64(env.vregs[28][0], S390CPU),
VMSTATE_UINT64(env.vregs[29][0], S390CPU),
VMSTATE_UINT64(env.vregs[30][0], S390CPU),
VMSTATE_UINT64(env.vregs[31][0], S390CPU),
VMSTATE_UINT64(env.vregs[0][1], S390CPU),
VMSTATE_UINT64(env.vregs[1][1], S390CPU),
VMSTATE_UINT64(env.vregs[2][1], S390CPU),
VMSTATE_UINT64(env.vregs[3][1], S390CPU),
VMSTATE_UINT64(env.vregs[4][1], S390CPU),
VMSTATE_UINT64(env.vregs[5][1], S390CPU),
VMSTATE_UINT64(env.vregs[6][1], S390CPU),
VMSTATE_UINT64(env.vregs[7][1], S390CPU),
VMSTATE_UINT64(env.vregs[8][1], S390CPU),
VMSTATE_UINT64(env.vregs[9][1], S390CPU),
VMSTATE_UINT64(env.vregs[10][1], S390CPU),
VMSTATE_UINT64(env.vregs[11][1], S390CPU),
VMSTATE_UINT64(env.vregs[12][1], S390CPU),
VMSTATE_UINT64(env.vregs[13][1], S390CPU),
VMSTATE_UINT64(env.vregs[14][1], S390CPU),
VMSTATE_UINT64(env.vregs[15][1], S390CPU),
VMSTATE_UINT64(env.vregs[16][1], S390CPU),
VMSTATE_UINT64(env.vregs[17][1], S390CPU),
VMSTATE_UINT64(env.vregs[18][1], S390CPU),
VMSTATE_UINT64(env.vregs[19][1], S390CPU),
VMSTATE_UINT64(env.vregs[20][1], S390CPU),
VMSTATE_UINT64(env.vregs[21][1], S390CPU),
VMSTATE_UINT64(env.vregs[22][1], S390CPU),
VMSTATE_UINT64(env.vregs[23][1], S390CPU),
VMSTATE_UINT64(env.vregs[24][1], S390CPU),
VMSTATE_UINT64(env.vregs[25][1], S390CPU),
VMSTATE_UINT64(env.vregs[26][1], S390CPU),
VMSTATE_UINT64(env.vregs[27][1], S390CPU),
VMSTATE_UINT64(env.vregs[28][1], S390CPU),
VMSTATE_UINT64(env.vregs[29][1], S390CPU),
VMSTATE_UINT64(env.vregs[30][1], S390CPU),
VMSTATE_UINT64(env.vregs[31][1], S390CPU),
VMSTATE_END_OF_LIST()
}
};
static bool riccb_needed(void *opaque)
{
return s390_has_feat(S390_FEAT_RUNTIME_INSTRUMENTATION);
}
const VMStateDescription vmstate_riccb = {
.name = "cpu/riccb",
.version_id = 1,
.minimum_version_id = 1,
.needed = riccb_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT8_ARRAY(env.riccb, S390CPU, 64),
VMSTATE_END_OF_LIST()
}
};
static bool exval_needed(void *opaque)
{
S390CPU *cpu = opaque;
return cpu->env.ex_value != 0;
}
const VMStateDescription vmstate_exval = {
.name = "cpu/exval",
.version_id = 1,
.minimum_version_id = 1,
.needed = exval_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64(env.ex_value, S390CPU),
VMSTATE_END_OF_LIST()
}
};
static bool gscb_needed(void *opaque)
{
return s390_has_feat(S390_FEAT_GUARDED_STORAGE);
}
const VMStateDescription vmstate_gscb = {
.name = "cpu/gscb",
.version_id = 1,
.minimum_version_id = 1,
.needed = gscb_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64_ARRAY(env.gscb, S390CPU, 4),
VMSTATE_END_OF_LIST()
}
};
static bool bpbc_needed(void *opaque)
{
return s390_has_feat(S390_FEAT_BPB);
}
const VMStateDescription vmstate_bpbc = {
.name = "cpu/bpbc",
.version_id = 1,
.minimum_version_id = 1,
.needed = bpbc_needed,
.fields = (VMStateField[]) {
VMSTATE_BOOL(env.bpbc, S390CPU),
VMSTATE_END_OF_LIST()
}
};
static bool etoken_needed(void *opaque)
{
return s390_has_feat(S390_FEAT_ETOKEN);
}
const VMStateDescription vmstate_etoken = {
.name = "cpu/etoken",
.version_id = 1,
.minimum_version_id = 1,
.needed = etoken_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64(env.etoken, S390CPU),
VMSTATE_UINT64(env.etoken_extension, S390CPU),
VMSTATE_END_OF_LIST()
}
};
static bool diag318_needed(void *opaque)
{
return s390_has_feat(S390_FEAT_DIAG_318);
}
const VMStateDescription vmstate_diag318 = {
.name = "cpu/diag318",
.version_id = 1,
.minimum_version_id = 1,
.needed = diag318_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64(env.diag318_info, S390CPU),
VMSTATE_END_OF_LIST()
}
};
const VMStateDescription vmstate_s390_cpu = {
.name = "cpu",
.post_load = cpu_post_load,
.pre_save = cpu_pre_save,
.version_id = 4,
.minimum_version_id = 3,
.fields = (VMStateField[]) {
VMSTATE_UINT64_ARRAY(env.regs, S390CPU, 16),
VMSTATE_UINT64(env.psw.mask, S390CPU),
VMSTATE_UINT64(env.psw.addr, S390CPU),
VMSTATE_UINT64(env.psa, S390CPU),
VMSTATE_UINT32(env.todpr, S390CPU),
VMSTATE_UINT64(env.pfault_token, S390CPU),
VMSTATE_UINT64(env.pfault_compare, S390CPU),
VMSTATE_UINT64(env.pfault_select, S390CPU),
VMSTATE_UINT64(env.cputm, S390CPU),
VMSTATE_UINT64(env.ckc, S390CPU),
VMSTATE_UINT64(env.gbea, S390CPU),
VMSTATE_UINT64(env.pp, S390CPU),
VMSTATE_UINT32_ARRAY(env.aregs, S390CPU, 16),
VMSTATE_UINT64_ARRAY(env.cregs, S390CPU, 16),
VMSTATE_UINT8(env.cpu_state, S390CPU),
VMSTATE_UINT8(env.sigp_order, S390CPU),
VMSTATE_UINT32_V(irqstate_saved_size, S390CPU, 4),
VMSTATE_VBUFFER_UINT32(irqstate, S390CPU, 4, NULL,
irqstate_saved_size),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription*[]) {
&vmstate_fpu,
&vmstate_vregs,
&vmstate_riccb,
&vmstate_exval,
&vmstate_gscb,
&vmstate_bpbc,
&vmstate_etoken,
&vmstate_diag318,
NULL
},
};
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