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qemu-e2k/target/arm/machine.c
Alex Bennée 062ba099e0 target-arm/powerctl: defer cpu reset work to CPU context 
When switching a new vCPU on we want to complete a bunch of the setup
work before we start scheduling the vCPU thread. To do this cleanly we
defer vCPU setup to async work which will run the vCPUs execution
context as the thread is woken up. The scheduling of the work will kick
the vCPU awake.

This avoids potential races in MTTCG system emulation.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
2017-02-24 10:32:46 +00:00

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#include "qemu/osdep.h"
#include "qemu-common.h"
#include "cpu.h"
#include "hw/hw.h"
#include "hw/boards.h"
#include "qemu/error-report.h"
#include "sysemu/kvm.h"
#include "kvm_arm.h"
#include "internals.h"
#include "migration/cpu.h"
static bool vfp_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_VFP);
}
static int get_fpscr(QEMUFile *f, void *opaque, size_t size,
VMStateField *field)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
uint32_t val = qemu_get_be32(f);
vfp_set_fpscr(env, val);
return 0;
}
static int put_fpscr(QEMUFile *f, void *opaque, size_t size,
VMStateField *field, QJSON *vmdesc)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
qemu_put_be32(f, vfp_get_fpscr(env));
return 0;
}
static const VMStateInfo vmstate_fpscr = {
.name = "fpscr",
.get = get_fpscr,
.put = put_fpscr,
};
static const VMStateDescription vmstate_vfp = {
.name = "cpu/vfp",
.version_id = 3,
.minimum_version_id = 3,
.needed = vfp_needed,
.fields = (VMStateField[]) {
VMSTATE_FLOAT64_ARRAY(env.vfp.regs, ARMCPU, 64),
/* The xregs array is a little awkward because element 1 (FPSCR)
* requires a specific accessor, so we have to split it up in
* the vmstate:
*/
VMSTATE_UINT32(env.vfp.xregs[0], ARMCPU),
VMSTATE_UINT32_SUB_ARRAY(env.vfp.xregs, ARMCPU, 2, 14),
{
.name = "fpscr",
.version_id = 0,
.size = sizeof(uint32_t),
.info = &vmstate_fpscr,
.flags = VMS_SINGLE,
.offset = 0,
},
VMSTATE_END_OF_LIST()
}
};
static bool iwmmxt_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_IWMMXT);
}
static const VMStateDescription vmstate_iwmmxt = {
.name = "cpu/iwmmxt",
.version_id = 1,
.minimum_version_id = 1,
.needed = iwmmxt_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64_ARRAY(env.iwmmxt.regs, ARMCPU, 16),
VMSTATE_UINT32_ARRAY(env.iwmmxt.cregs, ARMCPU, 16),
VMSTATE_END_OF_LIST()
}
};
static bool m_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_M);
}
static const VMStateDescription vmstate_m = {
.name = "cpu/m",
.version_id = 3,
.minimum_version_id = 3,
.needed = m_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT32(env.v7m.vecbase, ARMCPU),
VMSTATE_UINT32(env.v7m.basepri, ARMCPU),
VMSTATE_UINT32(env.v7m.control, ARMCPU),
VMSTATE_UINT32(env.v7m.ccr, ARMCPU),
VMSTATE_UINT32(env.v7m.cfsr, ARMCPU),
VMSTATE_UINT32(env.v7m.hfsr, ARMCPU),
VMSTATE_UINT32(env.v7m.dfsr, ARMCPU),
VMSTATE_UINT32(env.v7m.mmfar, ARMCPU),
VMSTATE_UINT32(env.v7m.bfar, ARMCPU),
VMSTATE_INT32(env.v7m.exception, ARMCPU),
VMSTATE_END_OF_LIST()
}
};
static bool thumb2ee_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_THUMB2EE);
}
static const VMStateDescription vmstate_thumb2ee = {
.name = "cpu/thumb2ee",
.version_id = 1,
.minimum_version_id = 1,
.needed = thumb2ee_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT32(env.teecr, ARMCPU),
VMSTATE_UINT32(env.teehbr, ARMCPU),
VMSTATE_END_OF_LIST()
}
};
static bool pmsav7_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_MPU) &&
arm_feature(env, ARM_FEATURE_V7);
}
static bool pmsav7_rgnr_vmstate_validate(void *opaque, int version_id)
{
ARMCPU *cpu = opaque;
return cpu->env.cp15.c6_rgnr < cpu->pmsav7_dregion;
}
static const VMStateDescription vmstate_pmsav7 = {
.name = "cpu/pmsav7",
.version_id = 1,
.minimum_version_id = 1,
.needed = pmsav7_needed,
.fields = (VMStateField[]) {
VMSTATE_VARRAY_UINT32(env.pmsav7.drbar, ARMCPU, pmsav7_dregion, 0,
vmstate_info_uint32, uint32_t),
VMSTATE_VARRAY_UINT32(env.pmsav7.drsr, ARMCPU, pmsav7_dregion, 0,
vmstate_info_uint32, uint32_t),
VMSTATE_VARRAY_UINT32(env.pmsav7.dracr, ARMCPU, pmsav7_dregion, 0,
vmstate_info_uint32, uint32_t),
VMSTATE_VALIDATE("rgnr is valid", pmsav7_rgnr_vmstate_validate),
VMSTATE_END_OF_LIST()
}
};
static int get_cpsr(QEMUFile *f, void *opaque, size_t size,
VMStateField *field)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
uint32_t val = qemu_get_be32(f);
env->aarch64 = ((val & PSTATE_nRW) == 0);
if (is_a64(env)) {
pstate_write(env, val);
return 0;
}
cpsr_write(env, val, 0xffffffff, CPSRWriteRaw);
return 0;
}
static int put_cpsr(QEMUFile *f, void *opaque, size_t size,
VMStateField *field, QJSON *vmdesc)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
uint32_t val;
if (is_a64(env)) {
val = pstate_read(env);
} else {
val = cpsr_read(env);
}
qemu_put_be32(f, val);
return 0;
}
static const VMStateInfo vmstate_cpsr = {
.name = "cpsr",
.get = get_cpsr,
.put = put_cpsr,
};
static int get_power(QEMUFile *f, void *opaque, size_t size,
VMStateField *field)
{
ARMCPU *cpu = opaque;
bool powered_off = qemu_get_byte(f);
cpu->power_state = powered_off ? PSCI_OFF : PSCI_ON;
return 0;
}
static int put_power(QEMUFile *f, void *opaque, size_t size,
VMStateField *field, QJSON *vmdesc)
{
ARMCPU *cpu = opaque;
/* Migration should never happen while we transition power states */
if (cpu->power_state == PSCI_ON ||
cpu->power_state == PSCI_OFF) {
bool powered_off = (cpu->power_state == PSCI_OFF) ? true : false;
qemu_put_byte(f, powered_off);
return 0;
} else {
return 1;
}
}
static const VMStateInfo vmstate_powered_off = {
.name = "powered_off",
.get = get_power,
.put = put_power,
};
static void cpu_pre_save(void *opaque)
{
ARMCPU *cpu = opaque;
if (kvm_enabled()) {
if (!write_kvmstate_to_list(cpu)) {
/* This should never fail */
abort();
}
} else {
if (!write_cpustate_to_list(cpu)) {
/* This should never fail. */
abort();
}
}
cpu->cpreg_vmstate_array_len = cpu->cpreg_array_len;
memcpy(cpu->cpreg_vmstate_indexes, cpu->cpreg_indexes,
cpu->cpreg_array_len * sizeof(uint64_t));
memcpy(cpu->cpreg_vmstate_values, cpu->cpreg_values,
cpu->cpreg_array_len * sizeof(uint64_t));
}
static int cpu_post_load(void *opaque, int version_id)
{
ARMCPU *cpu = opaque;
int i, v;
/* Update the values list from the incoming migration data.
* Anything in the incoming data which we don't know about is
* a migration failure; anything we know about but the incoming
* data doesn't specify retains its current (reset) value.
* The indexes list remains untouched -- we only inspect the
* incoming migration index list so we can match the values array
* entries with the right slots in our own values array.
*/
for (i = 0, v = 0; i < cpu->cpreg_array_len
&& v < cpu->cpreg_vmstate_array_len; i++) {
if (cpu->cpreg_vmstate_indexes[v] > cpu->cpreg_indexes[i]) {
/* register in our list but not incoming : skip it */
continue;
}
if (cpu->cpreg_vmstate_indexes[v] < cpu->cpreg_indexes[i]) {
/* register in their list but not ours: fail migration */
return -1;
}
/* matching register, copy the value over */
cpu->cpreg_values[i] = cpu->cpreg_vmstate_values[v];
v++;
}
if (kvm_enabled()) {
if (!write_list_to_kvmstate(cpu, KVM_PUT_FULL_STATE)) {
return -1;
}
/* Note that it's OK for the TCG side not to know about
* every register in the list; KVM is authoritative if
* we're using it.
*/
write_list_to_cpustate(cpu);
} else {
if (!write_list_to_cpustate(cpu)) {
return -1;
}
}
hw_breakpoint_update_all(cpu);
hw_watchpoint_update_all(cpu);
return 0;
}
const VMStateDescription vmstate_arm_cpu = {
.name = "cpu",
.version_id = 22,
.minimum_version_id = 22,
.pre_save = cpu_pre_save,
.post_load = cpu_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(env.regs, ARMCPU, 16),
VMSTATE_UINT64_ARRAY(env.xregs, ARMCPU, 32),
VMSTATE_UINT64(env.pc, ARMCPU),
{
.name = "cpsr",
.version_id = 0,
.size = sizeof(uint32_t),
.info = &vmstate_cpsr,
.flags = VMS_SINGLE,
.offset = 0,
},
VMSTATE_UINT32(env.spsr, ARMCPU),
VMSTATE_UINT64_ARRAY(env.banked_spsr, ARMCPU, 8),
VMSTATE_UINT32_ARRAY(env.banked_r13, ARMCPU, 8),
VMSTATE_UINT32_ARRAY(env.banked_r14, ARMCPU, 8),
VMSTATE_UINT32_ARRAY(env.usr_regs, ARMCPU, 5),
VMSTATE_UINT32_ARRAY(env.fiq_regs, ARMCPU, 5),
VMSTATE_UINT64_ARRAY(env.elr_el, ARMCPU, 4),
VMSTATE_UINT64_ARRAY(env.sp_el, ARMCPU, 4),
/* The length-check must come before the arrays to avoid
* incoming data possibly overflowing the array.
*/
VMSTATE_INT32_POSITIVE_LE(cpreg_vmstate_array_len, ARMCPU),
VMSTATE_VARRAY_INT32(cpreg_vmstate_indexes, ARMCPU,
cpreg_vmstate_array_len,
0, vmstate_info_uint64, uint64_t),
VMSTATE_VARRAY_INT32(cpreg_vmstate_values, ARMCPU,
cpreg_vmstate_array_len,
0, vmstate_info_uint64, uint64_t),
VMSTATE_UINT64(env.exclusive_addr, ARMCPU),
VMSTATE_UINT64(env.exclusive_val, ARMCPU),
VMSTATE_UINT64(env.exclusive_high, ARMCPU),
VMSTATE_UINT64(env.features, ARMCPU),
VMSTATE_UINT32(env.exception.syndrome, ARMCPU),
VMSTATE_UINT32(env.exception.fsr, ARMCPU),
VMSTATE_UINT64(env.exception.vaddress, ARMCPU),
VMSTATE_TIMER_PTR(gt_timer[GTIMER_PHYS], ARMCPU),
VMSTATE_TIMER_PTR(gt_timer[GTIMER_VIRT], ARMCPU),
{
.name = "power_state",
.version_id = 0,
.size = sizeof(bool),
.info = &vmstate_powered_off,
.flags = VMS_SINGLE,
.offset = 0,
},
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription*[]) {
&vmstate_vfp,
&vmstate_iwmmxt,
&vmstate_m,
&vmstate_thumb2ee,
&vmstate_pmsav7,
NULL
}
};
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