qemu-e2k/target/arm/kvm.c

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/*
* ARM implementation of KVM hooks
*
* Copyright Christoffer Dall 2009-2010
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include <sys/ioctl.h>
#include <linux/kvm.h>
#include "qemu-common.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "qom/object.h"
#include "qapi/error.h"
#include "sysemu/sysemu.h"
#include "sysemu/kvm.h"
#include "sysemu/kvm_int.h"
#include "kvm_arm.h"
#include "cpu.h"
#include "trace.h"
#include "internals.h"
#include "hw/pci/pci.h"
#include "exec/memattrs.h"
#include "exec/address-spaces.h"
#include "hw/boards.h"
#include "hw/irq.h"
#include "qemu/log.h"
const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
KVM_CAP_LAST_INFO
};
static bool cap_has_mp_state;
static bool cap_has_inject_serror_esr;
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
static ARMHostCPUFeatures arm_host_cpu_features;
int kvm_arm_vcpu_init(CPUState *cs)
{
ARMCPU *cpu = ARM_CPU(cs);
struct kvm_vcpu_init init;
init.target = cpu->kvm_target;
memcpy(init.features, cpu->kvm_init_features, sizeof(init.features));
return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
}
int kvm_arm_vcpu_finalize(CPUState *cs, int feature)
{
return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_FINALIZE, &feature);
}
void kvm_arm_init_serror_injection(CPUState *cs)
{
cap_has_inject_serror_esr = kvm_check_extension(cs->kvm_state,
KVM_CAP_ARM_INJECT_SERROR_ESR);
}
bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
int *fdarray,
struct kvm_vcpu_init *init)
{
int ret = 0, kvmfd = -1, vmfd = -1, cpufd = -1;
kvmfd = qemu_open("/dev/kvm", O_RDWR);
if (kvmfd < 0) {
goto err;
}
vmfd = ioctl(kvmfd, KVM_CREATE_VM, 0);
if (vmfd < 0) {
goto err;
}
cpufd = ioctl(vmfd, KVM_CREATE_VCPU, 0);
if (cpufd < 0) {
goto err;
}
if (!init) {
/* Caller doesn't want the VCPU to be initialized, so skip it */
goto finish;
}
if (init->target == -1) {
struct kvm_vcpu_init preferred;
ret = ioctl(vmfd, KVM_ARM_PREFERRED_TARGET, &preferred);
if (!ret) {
init->target = preferred.target;
}
}
if (ret >= 0) {
ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, init);
if (ret < 0) {
goto err;
}
} else if (cpus_to_try) {
/* Old kernel which doesn't know about the
* PREFERRED_TARGET ioctl: we know it will only support
* creating one kind of guest CPU which is its preferred
* CPU type.
*/
struct kvm_vcpu_init try;
while (*cpus_to_try != QEMU_KVM_ARM_TARGET_NONE) {
try.target = *cpus_to_try++;
memcpy(try.features, init->features, sizeof(init->features));
ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, &try);
if (ret >= 0) {
break;
}
}
if (ret < 0) {
goto err;
}
init->target = try.target;
} else {
/* Treat a NULL cpus_to_try argument the same as an empty
* list, which means we will fail the call since this must
* be an old kernel which doesn't support PREFERRED_TARGET.
*/
goto err;
}
finish:
fdarray[0] = kvmfd;
fdarray[1] = vmfd;
fdarray[2] = cpufd;
return true;
err:
if (cpufd >= 0) {
close(cpufd);
}
if (vmfd >= 0) {
close(vmfd);
}
if (kvmfd >= 0) {
close(kvmfd);
}
return false;
}
void kvm_arm_destroy_scratch_host_vcpu(int *fdarray)
{
int i;
for (i = 2; i >= 0; i--) {
close(fdarray[i]);
}
}
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
{
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
CPUARMState *env = &cpu->env;
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
if (!arm_host_cpu_features.dtb_compatible) {
if (!kvm_enabled() ||
!kvm_arm_get_host_cpu_features(&arm_host_cpu_features)) {
/* We can't report this error yet, so flag that we need to
* in arm_cpu_realizefn().
*/
cpu->kvm_target = QEMU_KVM_ARM_TARGET_NONE;
cpu->host_cpu_probe_failed = true;
return;
}
}
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
cpu->kvm_target = arm_host_cpu_features.target;
cpu->dtb_compatible = arm_host_cpu_features.dtb_compatible;
cpu->isar = arm_host_cpu_features.isar;
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
env->features = arm_host_cpu_features.features;
}
static bool kvm_no_adjvtime_get(Object *obj, Error **errp)
{
return !ARM_CPU(obj)->kvm_adjvtime;
}
static void kvm_no_adjvtime_set(Object *obj, bool value, Error **errp)
{
ARM_CPU(obj)->kvm_adjvtime = !value;
}
/* KVM VCPU properties should be prefixed with "kvm-". */
void kvm_arm_add_vcpu_properties(Object *obj)
{
if (!kvm_enabled()) {
return;
}
ARM_CPU(obj)->kvm_adjvtime = true;
object_property_add_bool(obj, "kvm-no-adjvtime", kvm_no_adjvtime_get,
kvm_no_adjvtime_set, &error_abort);
object_property_set_description(obj, "kvm-no-adjvtime",
"Set on to disable the adjustment of "
"the virtual counter. VM stopped time "
"will be counted.", &error_abort);
}
bool kvm_arm_pmu_supported(CPUState *cpu)
{
return kvm_check_extension(cpu->kvm_state, KVM_CAP_ARM_PMU_V3);
}
int kvm_arm_get_max_vm_ipa_size(MachineState *ms)
{
KVMState *s = KVM_STATE(ms->accelerator);
int ret;
ret = kvm_check_extension(s, KVM_CAP_ARM_VM_IPA_SIZE);
return ret > 0 ? ret : 40;
}
int kvm_arch_init(MachineState *ms, KVMState *s)
{
int ret = 0;
/* For ARM interrupt delivery is always asynchronous,
* whether we are using an in-kernel VGIC or not.
*/
kvm_async_interrupts_allowed = true;
/*
* PSCI wakes up secondary cores, so we always need to
* have vCPUs waiting in kernel space
*/
kvm_halt_in_kernel_allowed = true;
cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
if (ms->smp.cpus > 256 &&
!kvm_check_extension(s, KVM_CAP_ARM_IRQ_LINE_LAYOUT_2)) {
error_report("Using more than 256 vcpus requires a host kernel "
"with KVM_CAP_ARM_IRQ_LINE_LAYOUT_2");
ret = -EINVAL;
}
return ret;
}
unsigned long kvm_arch_vcpu_id(CPUState *cpu)
{
return cpu->cpu_index;
}
/* We track all the KVM devices which need their memory addresses
* passing to the kernel in a list of these structures.
* When board init is complete we run through the list and
* tell the kernel the base addresses of the memory regions.
* We use a MemoryListener to track mapping and unmapping of
* the regions during board creation, so the board models don't
* need to do anything special for the KVM case.
*
* Sometimes the address must be OR'ed with some other fields
* (for example for KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION).
* @kda_addr_ormask aims at storing the value of those fields.
*/
typedef struct KVMDevice {
struct kvm_arm_device_addr kda;
struct kvm_device_attr kdattr;
uint64_t kda_addr_ormask;
MemoryRegion *mr;
QSLIST_ENTRY(KVMDevice) entries;
int dev_fd;
} KVMDevice;
static QSLIST_HEAD(, KVMDevice) kvm_devices_head;
static void kvm_arm_devlistener_add(MemoryListener *listener,
MemoryRegionSection *section)
{
KVMDevice *kd;
QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
if (section->mr == kd->mr) {
kd->kda.addr = section->offset_within_address_space;
}
}
}
static void kvm_arm_devlistener_del(MemoryListener *listener,
MemoryRegionSection *section)
{
KVMDevice *kd;
QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
if (section->mr == kd->mr) {
kd->kda.addr = -1;
}
}
}
static MemoryListener devlistener = {
.region_add = kvm_arm_devlistener_add,
.region_del = kvm_arm_devlistener_del,
};
static void kvm_arm_set_device_addr(KVMDevice *kd)
{
struct kvm_device_attr *attr = &kd->kdattr;
int ret;
/* If the device control API is available and we have a device fd on the
* KVMDevice struct, let's use the newer API
*/
if (kd->dev_fd >= 0) {
uint64_t addr = kd->kda.addr;
addr |= kd->kda_addr_ormask;
attr->addr = (uintptr_t)&addr;
ret = kvm_device_ioctl(kd->dev_fd, KVM_SET_DEVICE_ATTR, attr);
} else {
ret = kvm_vm_ioctl(kvm_state, KVM_ARM_SET_DEVICE_ADDR, &kd->kda);
}
if (ret < 0) {
fprintf(stderr, "Failed to set device address: %s\n",
strerror(-ret));
abort();
}
}
static void kvm_arm_machine_init_done(Notifier *notifier, void *data)
{
KVMDevice *kd, *tkd;
QSLIST_FOREACH_SAFE(kd, &kvm_devices_head, entries, tkd) {
if (kd->kda.addr != -1) {
kvm_arm_set_device_addr(kd);
}
memory_region_unref(kd->mr);
QSLIST_REMOVE_HEAD(&kvm_devices_head, entries);
g_free(kd);
}
memory_listener_unregister(&devlistener);
}
static Notifier notify = {
.notify = kvm_arm_machine_init_done,
};
void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
uint64_t attr, int dev_fd, uint64_t addr_ormask)
{
KVMDevice *kd;
if (!kvm_irqchip_in_kernel()) {
return;
}
if (QSLIST_EMPTY(&kvm_devices_head)) {
memory_listener_register(&devlistener, &address_space_memory);
qemu_add_machine_init_done_notifier(&notify);
}
kd = g_new0(KVMDevice, 1);
kd->mr = mr;
kd->kda.id = devid;
kd->kda.addr = -1;
kd->kdattr.flags = 0;
kd->kdattr.group = group;
kd->kdattr.attr = attr;
kd->dev_fd = dev_fd;
kd->kda_addr_ormask = addr_ormask;
QSLIST_INSERT_HEAD(&kvm_devices_head, kd, entries);
memory_region_ref(kd->mr);
}
static int compare_u64(const void *a, const void *b)
{
if (*(uint64_t *)a > *(uint64_t *)b) {
return 1;
}
if (*(uint64_t *)a < *(uint64_t *)b) {
return -1;
}
return 0;
}
/*
* cpreg_values are sorted in ascending order by KVM register ID
* (see kvm_arm_init_cpreg_list). This allows us to cheaply find
* the storage for a KVM register by ID with a binary search.
*/
static uint64_t *kvm_arm_get_cpreg_ptr(ARMCPU *cpu, uint64_t regidx)
{
uint64_t *res;
res = bsearch(&regidx, cpu->cpreg_indexes, cpu->cpreg_array_len,
sizeof(uint64_t), compare_u64);
assert(res);
return &cpu->cpreg_values[res - cpu->cpreg_indexes];
}
/* Initialize the ARMCPU cpreg list according to the kernel's
* definition of what CPU registers it knows about (and throw away
* the previous TCG-created cpreg list).
*/
int kvm_arm_init_cpreg_list(ARMCPU *cpu)
{
struct kvm_reg_list rl;
struct kvm_reg_list *rlp;
int i, ret, arraylen;
CPUState *cs = CPU(cpu);
rl.n = 0;
ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, &rl);
if (ret != -E2BIG) {
return ret;
}
rlp = g_malloc(sizeof(struct kvm_reg_list) + rl.n * sizeof(uint64_t));
rlp->n = rl.n;
ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, rlp);
if (ret) {
goto out;
}
/* Sort the list we get back from the kernel, since cpreg_tuples
* must be in strictly ascending order.
*/
qsort(&rlp->reg, rlp->n, sizeof(rlp->reg[0]), compare_u64);
for (i = 0, arraylen = 0; i < rlp->n; i++) {
if (!kvm_arm_reg_syncs_via_cpreg_list(rlp->reg[i])) {
continue;
}
switch (rlp->reg[i] & KVM_REG_SIZE_MASK) {
case KVM_REG_SIZE_U32:
case KVM_REG_SIZE_U64:
break;
default:
fprintf(stderr, "Can't handle size of register in kernel list\n");
ret = -EINVAL;
goto out;
}
arraylen++;
}
cpu->cpreg_indexes = g_renew(uint64_t, cpu->cpreg_indexes, arraylen);
cpu->cpreg_values = g_renew(uint64_t, cpu->cpreg_values, arraylen);
cpu->cpreg_vmstate_indexes = g_renew(uint64_t, cpu->cpreg_vmstate_indexes,
arraylen);
cpu->cpreg_vmstate_values = g_renew(uint64_t, cpu->cpreg_vmstate_values,
arraylen);
cpu->cpreg_array_len = arraylen;
cpu->cpreg_vmstate_array_len = arraylen;
for (i = 0, arraylen = 0; i < rlp->n; i++) {
uint64_t regidx = rlp->reg[i];
if (!kvm_arm_reg_syncs_via_cpreg_list(regidx)) {
continue;
}
cpu->cpreg_indexes[arraylen] = regidx;
arraylen++;
}
assert(cpu->cpreg_array_len == arraylen);
if (!write_kvmstate_to_list(cpu)) {
/* Shouldn't happen unless kernel is inconsistent about
* what registers exist.
*/
fprintf(stderr, "Initial read of kernel register state failed\n");
ret = -EINVAL;
goto out;
}
out:
g_free(rlp);
return ret;
}
bool write_kvmstate_to_list(ARMCPU *cpu)
{
CPUState *cs = CPU(cpu);
int i;
bool ok = true;
for (i = 0; i < cpu->cpreg_array_len; i++) {
struct kvm_one_reg r;
uint64_t regidx = cpu->cpreg_indexes[i];
uint32_t v32;
int ret;
r.id = regidx;
switch (regidx & KVM_REG_SIZE_MASK) {
case KVM_REG_SIZE_U32:
r.addr = (uintptr_t)&v32;
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
if (!ret) {
cpu->cpreg_values[i] = v32;
}
break;
case KVM_REG_SIZE_U64:
r.addr = (uintptr_t)(cpu->cpreg_values + i);
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
break;
default:
abort();
}
if (ret) {
ok = false;
}
}
return ok;
}
bool write_list_to_kvmstate(ARMCPU *cpu, int level)
{
CPUState *cs = CPU(cpu);
int i;
bool ok = true;
for (i = 0; i < cpu->cpreg_array_len; i++) {
struct kvm_one_reg r;
uint64_t regidx = cpu->cpreg_indexes[i];
uint32_t v32;
int ret;
if (kvm_arm_cpreg_level(regidx) > level) {
continue;
}
r.id = regidx;
switch (regidx & KVM_REG_SIZE_MASK) {
case KVM_REG_SIZE_U32:
v32 = cpu->cpreg_values[i];
r.addr = (uintptr_t)&v32;
break;
case KVM_REG_SIZE_U64:
r.addr = (uintptr_t)(cpu->cpreg_values + i);
break;
default:
abort();
}
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
if (ret) {
/* We might fail for "unknown register" and also for
* "you tried to set a register which is constant with
* a different value from what it actually contains".
*/
ok = false;
}
}
return ok;
}
void kvm_arm_cpu_pre_save(ARMCPU *cpu)
{
/* KVM virtual time adjustment */
if (cpu->kvm_vtime_dirty) {
*kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT) = cpu->kvm_vtime;
}
}
void kvm_arm_cpu_post_load(ARMCPU *cpu)
{
/* KVM virtual time adjustment */
if (cpu->kvm_adjvtime) {
cpu->kvm_vtime = *kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT);
cpu->kvm_vtime_dirty = true;
}
}
void kvm_arm_reset_vcpu(ARMCPU *cpu)
{
int ret;
/* Re-init VCPU so that all registers are set to
* their respective reset values.
*/
ret = kvm_arm_vcpu_init(CPU(cpu));
if (ret < 0) {
fprintf(stderr, "kvm_arm_vcpu_init failed: %s\n", strerror(-ret));
abort();
}
if (!write_kvmstate_to_list(cpu)) {
fprintf(stderr, "write_kvmstate_to_list failed\n");
abort();
}
arm: Allow system registers for KVM guests to be changed by QEMU code At the moment the Arm implementations of kvm_arch_{get,put}_registers() don't support having QEMU change the values of system registers (aka coprocessor registers for AArch32). This is because although kvm_arch_get_registers() calls write_list_to_cpustate() to update the CPU state struct fields (so QEMU code can read the values in the usual way), kvm_arch_put_registers() does not call write_cpustate_to_list(), meaning that any changes to the CPU state struct fields will not be passed back to KVM. The rationale for this design is documented in a comment in the AArch32 kvm_arch_put_registers() -- writing the values in the cpregs list into the CPU state struct is "lossy" because the write of a register might not succeed, and so if we blindly copy the CPU state values back again we will incorrectly change register values for the guest. The assumption was that no QEMU code would need to write to the registers. However, when we implemented debug support for KVM guests, we broke that assumption: the code to handle "set the guest up to take a breakpoint exception" does so by updating various guest registers including ESR_EL1. Support this by making kvm_arch_put_registers() synchronize CPU state back into the list. We sync only those registers where the initial write succeeds, which should be sufficient. This commit is the same as commit 823e1b3818f9b10b824ddc which we had to revert in commit 942f99c825fc94c8b1a4, except that the bug which was preventing EDK2 guest firmware running has been fixed: kvm_arm_reset_vcpu() now calls write_list_to_cpustate(). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Tested-by: Eric Auger <eric.auger@redhat.com>
2019-05-07 13:55:02 +02:00
/*
* Sync the reset values also into the CPUState. This is necessary
* because the next thing we do will be a kvm_arch_put_registers()
* which will update the list values from the CPUState before copying
* the list values back to KVM. It's OK to ignore failure returns here
* for the same reason we do so in kvm_arch_get_registers().
*/
write_list_to_cpustate(cpu);
}
/*
* Update KVM's MP_STATE based on what QEMU thinks it is
*/
int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu)
{
if (cap_has_mp_state) {
struct kvm_mp_state mp_state = {
.mp_state = (cpu->power_state == PSCI_OFF) ?
KVM_MP_STATE_STOPPED : KVM_MP_STATE_RUNNABLE
};
int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
if (ret) {
fprintf(stderr, "%s: failed to set MP_STATE %d/%s\n",
__func__, ret, strerror(-ret));
return -1;
}
}
return 0;
}
/*
* Sync the KVM MP_STATE into QEMU
*/
int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu)
{
if (cap_has_mp_state) {
struct kvm_mp_state mp_state;
int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MP_STATE, &mp_state);
if (ret) {
fprintf(stderr, "%s: failed to get MP_STATE %d/%s\n",
__func__, ret, strerror(-ret));
abort();
}
cpu->power_state = (mp_state.mp_state == KVM_MP_STATE_STOPPED) ?
PSCI_OFF : PSCI_ON;
}
return 0;
}
void kvm_arm_get_virtual_time(CPUState *cs)
{
ARMCPU *cpu = ARM_CPU(cs);
struct kvm_one_reg reg = {
.id = KVM_REG_ARM_TIMER_CNT,
.addr = (uintptr_t)&cpu->kvm_vtime,
};
int ret;
if (cpu->kvm_vtime_dirty) {
return;
}
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
error_report("Failed to get KVM_REG_ARM_TIMER_CNT");
abort();
}
cpu->kvm_vtime_dirty = true;
}
void kvm_arm_put_virtual_time(CPUState *cs)
{
ARMCPU *cpu = ARM_CPU(cs);
struct kvm_one_reg reg = {
.id = KVM_REG_ARM_TIMER_CNT,
.addr = (uintptr_t)&cpu->kvm_vtime,
};
int ret;
if (!cpu->kvm_vtime_dirty) {
return;
}
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
error_report("Failed to set KVM_REG_ARM_TIMER_CNT");
abort();
}
cpu->kvm_vtime_dirty = false;
}
int kvm_put_vcpu_events(ARMCPU *cpu)
{
CPUARMState *env = &cpu->env;
struct kvm_vcpu_events events;
int ret;
if (!kvm_has_vcpu_events()) {
return 0;
}
memset(&events, 0, sizeof(events));
events.exception.serror_pending = env->serror.pending;
/* Inject SError to guest with specified syndrome if host kernel
* supports it, otherwise inject SError without syndrome.
*/
if (cap_has_inject_serror_esr) {
events.exception.serror_has_esr = env->serror.has_esr;
events.exception.serror_esr = env->serror.esr;
}
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_VCPU_EVENTS, &events);
if (ret) {
error_report("failed to put vcpu events");
}
return ret;
}
int kvm_get_vcpu_events(ARMCPU *cpu)
{
CPUARMState *env = &cpu->env;
struct kvm_vcpu_events events;
int ret;
if (!kvm_has_vcpu_events()) {
return 0;
}
memset(&events, 0, sizeof(events));
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_VCPU_EVENTS, &events);
if (ret) {
error_report("failed to get vcpu events");
return ret;
}
env->serror.pending = events.exception.serror_pending;
env->serror.has_esr = events.exception.serror_has_esr;
env->serror.esr = events.exception.serror_esr;
return 0;
}
void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
{
}
MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
{
ARMCPU *cpu;
uint32_t switched_level;
if (kvm_irqchip_in_kernel()) {
/*
* We only need to sync timer states with user-space interrupt
* controllers, so return early and save cycles if we don't.
*/
return MEMTXATTRS_UNSPECIFIED;
}
cpu = ARM_CPU(cs);
/* Synchronize our shadowed in-kernel device irq lines with the kvm ones */
if (run->s.regs.device_irq_level != cpu->device_irq_level) {
switched_level = cpu->device_irq_level ^ run->s.regs.device_irq_level;
qemu_mutex_lock_iothread();
if (switched_level & KVM_ARM_DEV_EL1_VTIMER) {
qemu_set_irq(cpu->gt_timer_outputs[GTIMER_VIRT],
!!(run->s.regs.device_irq_level &
KVM_ARM_DEV_EL1_VTIMER));
switched_level &= ~KVM_ARM_DEV_EL1_VTIMER;
}
if (switched_level & KVM_ARM_DEV_EL1_PTIMER) {
qemu_set_irq(cpu->gt_timer_outputs[GTIMER_PHYS],
!!(run->s.regs.device_irq_level &
KVM_ARM_DEV_EL1_PTIMER));
switched_level &= ~KVM_ARM_DEV_EL1_PTIMER;
}
if (switched_level & KVM_ARM_DEV_PMU) {
qemu_set_irq(cpu->pmu_interrupt,
!!(run->s.regs.device_irq_level & KVM_ARM_DEV_PMU));
switched_level &= ~KVM_ARM_DEV_PMU;
}
if (switched_level) {
qemu_log_mask(LOG_UNIMP, "%s: unhandled in-kernel device IRQ %x\n",
__func__, switched_level);
}
/* We also mark unknown levels as processed to not waste cycles */
cpu->device_irq_level = run->s.regs.device_irq_level;
qemu_mutex_unlock_iothread();
}
return MEMTXATTRS_UNSPECIFIED;
}
void kvm_arm_vm_state_change(void *opaque, int running, RunState state)
{
CPUState *cs = opaque;
ARMCPU *cpu = ARM_CPU(cs);
if (running) {
if (cpu->kvm_adjvtime) {
kvm_arm_put_virtual_time(cs);
}
} else {
if (cpu->kvm_adjvtime) {
kvm_arm_get_virtual_time(cs);
}
}
}
int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
{
int ret = 0;
switch (run->exit_reason) {
case KVM_EXIT_DEBUG:
if (kvm_arm_handle_debug(cs, &run->debug.arch)) {
ret = EXCP_DEBUG;
} /* otherwise return to guest */
break;
default:
qemu_log_mask(LOG_UNIMP, "%s: un-handled exit reason %d\n",
__func__, run->exit_reason);
break;
}
return ret;
}
bool kvm_arch_stop_on_emulation_error(CPUState *cs)
{
return true;
}
int kvm_arch_process_async_events(CPUState *cs)
{
return 0;
}
/* The #ifdef protections are until 32bit headers are imported and can
* be removed once both 32 and 64 bit reach feature parity.
*/
void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg)
{
#ifdef KVM_GUESTDBG_USE_SW_BP
if (kvm_sw_breakpoints_active(cs)) {
dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
}
#endif
#ifdef KVM_GUESTDBG_USE_HW
if (kvm_arm_hw_debug_active(cs)) {
dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW;
kvm_arm_copy_hw_debug_data(&dbg->arch);
}
#endif
}
void kvm_arch_init_irq_routing(KVMState *s)
{
}
int kvm_arch_irqchip_create(KVMState *s)
{
if (kvm_kernel_irqchip_split()) {
perror("-machine kernel_irqchip=split is not supported on ARM.");
exit(1);
}
/* If we can create the VGIC using the newer device control API, we
* let the device do this when it initializes itself, otherwise we
* fall back to the old API */
return kvm_check_extension(s, KVM_CAP_DEVICE_CTRL);
}
int kvm_arm_vgic_probe(void)
{
if (kvm_create_device(kvm_state,
KVM_DEV_TYPE_ARM_VGIC_V3, true) == 0) {
return 3;
} else if (kvm_create_device(kvm_state,
KVM_DEV_TYPE_ARM_VGIC_V2, true) == 0) {
return 2;
} else {
return 0;
}
}
int kvm_arm_set_irq(int cpu, int irqtype, int irq, int level)
{
int kvm_irq = (irqtype << KVM_ARM_IRQ_TYPE_SHIFT) | irq;
int cpu_idx1 = cpu % 256;
int cpu_idx2 = cpu / 256;
kvm_irq |= (cpu_idx1 << KVM_ARM_IRQ_VCPU_SHIFT) |
(cpu_idx2 << KVM_ARM_IRQ_VCPU2_SHIFT);
return kvm_set_irq(kvm_state, kvm_irq, !!level);
}
int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
uint64_t address, uint32_t data, PCIDevice *dev)
{
AddressSpace *as = pci_device_iommu_address_space(dev);
hwaddr xlat, len, doorbell_gpa;
MemoryRegionSection mrs;
MemoryRegion *mr;
int ret = 1;
if (as == &address_space_memory) {
return 0;
}
/* MSI doorbell address is translated by an IOMMU */
rcu_read_lock();
mr = address_space_translate(as, address, &xlat, &len, true,
MEMTXATTRS_UNSPECIFIED);
if (!mr) {
goto unlock;
}
mrs = memory_region_find(mr, xlat, 1);
if (!mrs.mr) {
goto unlock;
}
doorbell_gpa = mrs.offset_within_address_space;
memory_region_unref(mrs.mr);
route->u.msi.address_lo = doorbell_gpa;
route->u.msi.address_hi = doorbell_gpa >> 32;
trace_kvm_arm_fixup_msi_route(address, doorbell_gpa);
ret = 0;
unlock:
rcu_read_unlock();
return ret;
}
int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
int vector, PCIDevice *dev)
{
return 0;
}
int kvm_arch_release_virq_post(int virq)
{
return 0;
}
int kvm_arch_msi_data_to_gsi(uint32_t data)
{
return (data - 32) & 0xffff;
}