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Merge branch kvm-arm64/psci-suspend into kvmarm-master/next

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* kvm-arm64/psci-suspend:
  : .
  : Add support for PSCI SYSTEM_SUSPEND and allow userspace to
  : filter the wake-up events.
  :
  : Patches courtesy of Oliver.
  : .
  Documentation: KVM: Fix title level for PSCI_SUSPEND
  selftests: KVM: Test SYSTEM_SUSPEND PSCI call
  selftests: KVM: Refactor psci_test to make it amenable to new tests
  selftests: KVM: Use KVM_SET_MP_STATE to power off vCPU in psci_test
  selftests: KVM: Create helper for making SMCCC calls
  selftests: KVM: Rename psci_cpu_on_test to psci_test
  KVM: arm64: Implement PSCI SYSTEM_SUSPEND
  KVM: arm64: Add support for userspace to suspend a vCPU
  KVM: arm64: Return a value from check_vcpu_requests()
  KVM: arm64: Rename the KVM_REQ_SLEEP handler
  KVM: arm64: Track vCPU power state using MP state values
  KVM: arm64: Dedupe vCPU power off helpers
  KVM: arm64: Don't depend on fallthrough to hide SYSTEM_RESET2

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2022-05-16 17:48:20 +01:00
commit 3b8e21e3c3
6 changed files with 349 additions and 77 deletions
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76
Documentation/virt/kvm/api.rst
View File

@ -1476,14 +1476,43 @@ Possible values are:
[s390]
KVM_MP_STATE_LOAD the vcpu is in a special load/startup state
[s390]
KVM_MP_STATE_SUSPENDED the vcpu is in a suspend state and is waiting
for a wakeup event [arm64]
========================== ===============================================
On x86, this ioctl is only useful after KVM_CREATE_IRQCHIP. Without an
in-kernel irqchip, the multiprocessing state must be maintained by userspace on
these architectures.
For arm64/riscv:
^^^^^^^^^^^^^^^^
For arm64:
^^^^^^^^^^
If a vCPU is in the KVM_MP_STATE_SUSPENDED state, KVM will emulate the
architectural execution of a WFI instruction.
If a wakeup event is recognized, KVM will exit to userspace with a
KVM_SYSTEM_EVENT exit, where the event type is KVM_SYSTEM_EVENT_WAKEUP. If
userspace wants to honor the wakeup, it must set the vCPU's MP state to
KVM_MP_STATE_RUNNABLE. If it does not, KVM will continue to await a wakeup
event in subsequent calls to KVM_RUN.
.. warning::
If userspace intends to keep the vCPU in a SUSPENDED state, it is
strongly recommended that userspace take action to suppress the
wakeup event (such as masking an interrupt). Otherwise, subsequent
calls to KVM_RUN will immediately exit with a KVM_SYSTEM_EVENT_WAKEUP
event and inadvertently waste CPU cycles.
Additionally, if userspace takes action to suppress a wakeup event,
it is strongly recommended that it also restores the vCPU to its
original state when the vCPU is made RUNNABLE again. For example,
if userspace masked a pending interrupt to suppress the wakeup,
the interrupt should be unmasked before returning control to the
guest.
For riscv:
^^^^^^^^^^
The only states that are valid are KVM_MP_STATE_STOPPED and
KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not.
@ -6003,6 +6032,8 @@ should put the acknowledged interrupt vector into the 'epr' field.
#define KVM_SYSTEM_EVENT_SHUTDOWN 1
#define KVM_SYSTEM_EVENT_RESET 2
#define KVM_SYSTEM_EVENT_CRASH 3
#define KVM_SYSTEM_EVENT_WAKEUP 4
#define KVM_SYSTEM_EVENT_SUSPEND 5
__u32 type;
__u32 ndata;
__u64 data[16];
@ -6027,6 +6058,37 @@ Valid values for 'type' are:
has requested a crash condition maintenance. Userspace can choose
to ignore the request, or to gather VM memory core dump and/or
reset/shutdown of the VM.
- KVM_SYSTEM_EVENT_WAKEUP -- the exiting vCPU is in a suspended state and
KVM has recognized a wakeup event. Userspace may honor this event by
marking the exiting vCPU as runnable, or deny it and call KVM_RUN again.
- KVM_SYSTEM_EVENT_SUSPEND -- the guest has requested a suspension of
the VM.
For arm/arm64:
--------------
KVM_SYSTEM_EVENT_SUSPEND exits are enabled with the
KVM_CAP_ARM_SYSTEM_SUSPEND VM capability. If a guest invokes the PSCI
SYSTEM_SUSPEND function, KVM will exit to userspace with this event
type.
It is the sole responsibility of userspace to implement the PSCI
SYSTEM_SUSPEND call according to ARM DEN0022D.b 5.19 "SYSTEM_SUSPEND".
KVM does not change the vCPU's state before exiting to userspace, so
the call parameters are left in-place in the vCPU registers.
Userspace is _required_ to take action for such an exit. It must
either:
- Honor the guest request to suspend the VM. Userspace can request
in-kernel emulation of suspension by setting the calling vCPU's
state to KVM_MP_STATE_SUSPENDED. Userspace must configure the vCPU's
state according to the parameters passed to the PSCI function when
the calling vCPU is resumed. See ARM DEN0022D.b 5.19.1 "Intended use"
for details on the function parameters.
- Deny the guest request to suspend the VM. See ARM DEN0022D.b 5.19.2
"Caller responsibilities" for possible return values.
If KVM_CAP_SYSTEM_EVENT_DATA is present, the 'data' field can contain
architecture specific information for the system-level event. Only
@ -7752,6 +7814,16 @@ At this time, KVM_PMU_CAP_DISABLE is the only capability. Setting
this capability will disable PMU virtualization for that VM. Usermode
should adjust CPUID leaf 0xA to reflect that the PMU is disabled.
8.36 KVM_CAP_ARM_SYSTEM_SUSPEND
-------------------------------
:Capability: KVM_CAP_ARM_SYSTEM_SUSPEND
:Architectures: arm64
:Type: vm
When enabled, KVM will exit to userspace with KVM_EXIT_SYSTEM_EVENT of
type KVM_SYSTEM_EVENT_SUSPEND to process the guest suspend request.
9. Known KVM API problems
=========================

10
arch/arm64/include/asm/kvm_host.h
View File

@ -46,6 +46,7 @@
#define KVM_REQ_RECORD_STEAL KVM_ARCH_REQ(3)
#define KVM_REQ_RELOAD_GICv4 KVM_ARCH_REQ(4)
#define KVM_REQ_RELOAD_PMU KVM_ARCH_REQ(5)
#define KVM_REQ_SUSPEND KVM_ARCH_REQ(6)
#define KVM_DIRTY_LOG_MANUAL_CAPS (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE | \
KVM_DIRTY_LOG_INITIALLY_SET)
@ -149,6 +150,8 @@ struct kvm_arch {
*/
#define KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED 3
#define KVM_ARCH_FLAG_EL1_32BIT 4
/* PSCI SYSTEM_SUSPEND enabled for the guest */
#define KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED 5
unsigned long flags;
@ -384,8 +387,8 @@ struct kvm_vcpu_arch {
u32 mdscr_el1;
} guest_debug_preserved;
/* vcpu power-off state */
bool power_off;
/* vcpu power state */
struct kvm_mp_state mp_state;
/* Don't run the guest (internal implementation need) */
bool pause;
@ -863,4 +866,7 @@ void __init kvm_hyp_reserve(void);
static inline void kvm_hyp_reserve(void) { }
#endif
void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu);
bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu);
#endif /* __ARM64_KVM_HOST_H__ */

104
arch/arm64/kvm/arm.c
View File

@ -97,6 +97,10 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
}
mutex_unlock(&kvm->lock);
break;
case KVM_CAP_ARM_SYSTEM_SUSPEND:
r = 0;
set_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags);
break;
default:
r = -EINVAL;
break;
@ -211,6 +215,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_SET_GUEST_DEBUG:
case KVM_CAP_VCPU_ATTRIBUTES:
case KVM_CAP_PTP_KVM:
case KVM_CAP_ARM_SYSTEM_SUSPEND:
r = 1;
break;
case KVM_CAP_SET_GUEST_DEBUG2:
@ -428,20 +433,34 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
vcpu->cpu = -1;
}
static void vcpu_power_off(struct kvm_vcpu *vcpu)
void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu)
{
vcpu->arch.power_off = true;
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_STOPPED;
kvm_make_request(KVM_REQ_SLEEP, vcpu);
kvm_vcpu_kick(vcpu);
}
bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu)
{
return vcpu->arch.mp_state.mp_state == KVM_MP_STATE_STOPPED;
}
static void kvm_arm_vcpu_suspend(struct kvm_vcpu *vcpu)
{
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_SUSPENDED;
kvm_make_request(KVM_REQ_SUSPEND, vcpu);
kvm_vcpu_kick(vcpu);
}
static bool kvm_arm_vcpu_suspended(struct kvm_vcpu *vcpu)
{
return vcpu->arch.mp_state.mp_state == KVM_MP_STATE_SUSPENDED;
}
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
if (vcpu->arch.power_off)
mp_state->mp_state = KVM_MP_STATE_STOPPED;
else
mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
*mp_state = vcpu->arch.mp_state;
return 0;
}
@ -453,10 +472,13 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
switch (mp_state->mp_state) {
case KVM_MP_STATE_RUNNABLE:
vcpu->arch.power_off = false;
vcpu->arch.mp_state = *mp_state;
break;
case KVM_MP_STATE_STOPPED:
vcpu_power_off(vcpu);
kvm_arm_vcpu_power_off(vcpu);
break;
case KVM_MP_STATE_SUSPENDED:
kvm_arm_vcpu_suspend(vcpu);
break;
default:
ret = -EINVAL;
@ -476,7 +498,7 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
&& !v->arch.power_off && !v->arch.pause);
&& !kvm_arm_vcpu_stopped(v) && !v->arch.pause);
}
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
@ -588,15 +610,15 @@ void kvm_arm_resume_guest(struct kvm *kvm)
}
}
static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
static void kvm_vcpu_sleep(struct kvm_vcpu *vcpu)
{
struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
rcuwait_wait_event(wait,
(!vcpu->arch.power_off) &&(!vcpu->arch.pause),
(!kvm_arm_vcpu_stopped(vcpu)) && (!vcpu->arch.pause),
TASK_INTERRUPTIBLE);
if (vcpu->arch.power_off || vcpu->arch.pause) {
if (kvm_arm_vcpu_stopped(vcpu) || vcpu->arch.pause) {
/* Awaken to handle a signal, request we sleep again later. */
kvm_make_request(KVM_REQ_SLEEP, vcpu);
}
@ -643,11 +665,53 @@ void kvm_vcpu_wfi(struct kvm_vcpu *vcpu)
preempt_enable();
}
static void check_vcpu_requests(struct kvm_vcpu *vcpu)
static int kvm_vcpu_suspend(struct kvm_vcpu *vcpu)
{
if (!kvm_arm_vcpu_suspended(vcpu))
return 1;
kvm_vcpu_wfi(vcpu);
/*
* The suspend state is sticky; we do not leave it until userspace
* explicitly marks the vCPU as runnable. Request that we suspend again
* later.
*/
kvm_make_request(KVM_REQ_SUSPEND, vcpu);
/*
* Check to make sure the vCPU is actually runnable. If so, exit to
* userspace informing it of the wakeup condition.
*/
if (kvm_arch_vcpu_runnable(vcpu)) {
memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
vcpu->run->system_event.type = KVM_SYSTEM_EVENT_WAKEUP;
vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
return 0;
}
/*
* Otherwise, we were unblocked to process a different event, such as a
* pending signal. Return 1 and allow kvm_arch_vcpu_ioctl_run() to
* process the event.
*/
return 1;
}
/**
* check_vcpu_requests - check and handle pending vCPU requests
* @vcpu: the VCPU pointer
*
* Return: 1 if we should enter the guest
* 0 if we should exit to userspace
* < 0 if we should exit to userspace, where the return value indicates
* an error
*/
static int check_vcpu_requests(struct kvm_vcpu *vcpu)
{
if (kvm_request_pending(vcpu)) {
if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
vcpu_req_sleep(vcpu);
kvm_vcpu_sleep(vcpu);
if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
kvm_reset_vcpu(vcpu);
@ -672,7 +736,12 @@ static void check_vcpu_requests(struct kvm_vcpu *vcpu)
if (kvm_check_request(KVM_REQ_RELOAD_PMU, vcpu))
kvm_pmu_handle_pmcr(vcpu,
__vcpu_sys_reg(vcpu, PMCR_EL0));
if (kvm_check_request(KVM_REQ_SUSPEND, vcpu))
return kvm_vcpu_suspend(vcpu);
}
return 1;
}
static bool vcpu_mode_is_bad_32bit(struct kvm_vcpu *vcpu)
@ -788,7 +857,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
if (!ret)
ret = 1;
check_vcpu_requests(vcpu);
if (ret > 0)
ret = check_vcpu_requests(vcpu);
/*
* Preparing the interrupts to be injected also
@ -1121,9 +1191,9 @@ static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
* Handle the "start in power-off" case.
*/
if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
vcpu_power_off(vcpu);
kvm_arm_vcpu_power_off(vcpu);
else
vcpu->arch.power_off = false;
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_RUNNABLE;
return 0;
}

65
arch/arm64/kvm/psci.c
View File

@ -51,13 +51,6 @@ static unsigned long kvm_psci_vcpu_suspend(struct kvm_vcpu *vcpu)
return PSCI_RET_SUCCESS;
}
static void kvm_psci_vcpu_off(struct kvm_vcpu *vcpu)
{
vcpu->arch.power_off = true;
kvm_make_request(KVM_REQ_SLEEP, vcpu);
kvm_vcpu_kick(vcpu);
}
static inline bool kvm_psci_valid_affinity(struct kvm_vcpu *vcpu,
unsigned long affinity)
{
@ -83,7 +76,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
*/
if (!vcpu)
return PSCI_RET_INVALID_PARAMS;
if (!vcpu->arch.power_off) {
if (!kvm_arm_vcpu_stopped(vcpu)) {
if (kvm_psci_version(source_vcpu) != KVM_ARM_PSCI_0_1)
return PSCI_RET_ALREADY_ON;
else
@ -107,12 +100,12 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
kvm_make_request(KVM_REQ_VCPU_RESET, vcpu);
/*
* Make sure the reset request is observed if the change to
* power_off is observed.
* Make sure the reset request is observed if the RUNNABLE mp_state is
* observed.
*/
smp_wmb();
vcpu->arch.power_off = false;
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_RUNNABLE;
kvm_vcpu_wake_up(vcpu);
return PSCI_RET_SUCCESS;
@ -150,7 +143,7 @@ static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
mpidr = kvm_vcpu_get_mpidr_aff(tmp);
if ((mpidr & target_affinity_mask) == target_affinity) {
matching_cpus++;
if (!tmp->arch.power_off)
if (!kvm_arm_vcpu_stopped(tmp))
return PSCI_0_2_AFFINITY_LEVEL_ON;
}
}
@ -176,7 +169,7 @@ static void kvm_prepare_system_event(struct kvm_vcpu *vcpu, u32 type, u64 flags)
* re-initialized.
*/
kvm_for_each_vcpu(i, tmp, vcpu->kvm)
tmp->arch.power_off = true;
tmp->arch.mp_state.mp_state = KVM_MP_STATE_STOPPED;
kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
@ -202,6 +195,15 @@ static void kvm_psci_system_reset2(struct kvm_vcpu *vcpu)
KVM_SYSTEM_EVENT_RESET_FLAG_PSCI_RESET2);
}
static void kvm_psci_system_suspend(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
memset(&run->system_event, 0, sizeof(vcpu->run->system_event));
run->system_event.type = KVM_SYSTEM_EVENT_SUSPEND;
run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
}
static void kvm_psci_narrow_to_32bit(struct kvm_vcpu *vcpu)
{
int i;
@ -245,7 +247,7 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
val = kvm_psci_vcpu_suspend(vcpu);
break;
case PSCI_0_2_FN_CPU_OFF:
kvm_psci_vcpu_off(vcpu);
kvm_arm_vcpu_power_off(vcpu);
val = PSCI_RET_SUCCESS;
break;
case PSCI_0_2_FN_CPU_ON:
@ -305,9 +307,10 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
{
unsigned long val = PSCI_RET_NOT_SUPPORTED;
u32 psci_fn = smccc_get_function(vcpu);
struct kvm *kvm = vcpu->kvm;
u32 arg;
unsigned long val;
int ret = 1;
switch(psci_fn) {
@ -320,6 +323,8 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
if (val)
break;
val = PSCI_RET_NOT_SUPPORTED;
switch(arg) {
case PSCI_0_2_FN_PSCI_VERSION:
case PSCI_0_2_FN_CPU_SUSPEND:
@ -336,18 +341,32 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
case ARM_SMCCC_VERSION_FUNC_ID:
val = 0;
break;
case PSCI_1_0_FN_SYSTEM_SUSPEND:
case PSCI_1_0_FN64_SYSTEM_SUSPEND:
if (test_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags))
val = 0;
break;
case PSCI_1_1_FN_SYSTEM_RESET2:
case PSCI_1_1_FN64_SYSTEM_RESET2:
if (minor >= 1) {
if (minor >= 1)
val = 0;
break;
}
fallthrough;
default:
val = PSCI_RET_NOT_SUPPORTED;
break;
}
break;
case PSCI_1_0_FN_SYSTEM_SUSPEND:
kvm_psci_narrow_to_32bit(vcpu);
fallthrough;
case PSCI_1_0_FN64_SYSTEM_SUSPEND:
/*
* Return directly to userspace without changing the vCPU's
* registers. Userspace depends on reading the SMCCC parameters
* to implement SYSTEM_SUSPEND.
*/
if (test_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags)) {
kvm_psci_system_suspend(vcpu);
return 0;
}
break;
case PSCI_1_1_FN_SYSTEM_RESET2:
kvm_psci_narrow_to_32bit(vcpu);
fallthrough;
@ -365,7 +384,7 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
val = PSCI_RET_INVALID_PARAMS;
break;
}
fallthrough;
break;
default:
return kvm_psci_0_2_call(vcpu);
}
@ -382,7 +401,7 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
switch (psci_fn) {
case KVM_PSCI_FN_CPU_OFF:
kvm_psci_vcpu_off(vcpu);
kvm_arm_vcpu_power_off(vcpu);
val = PSCI_RET_SUCCESS;
break;
case KVM_PSCI_FN_CPU_ON:

4
include/uapi/linux/kvm.h
View File

@ -444,6 +444,8 @@ struct kvm_run {
#define KVM_SYSTEM_EVENT_SHUTDOWN 1
#define KVM_SYSTEM_EVENT_RESET 2
#define KVM_SYSTEM_EVENT_CRASH 3
#define KVM_SYSTEM_EVENT_WAKEUP 4
#define KVM_SYSTEM_EVENT_SUSPEND 5
__u32 type;
__u32 ndata;
union {
@ -646,6 +648,7 @@ struct kvm_vapic_addr {
#define KVM_MP_STATE_OPERATING 7
#define KVM_MP_STATE_LOAD 8
#define KVM_MP_STATE_AP_RESET_HOLD 9
#define KVM_MP_STATE_SUSPENDED 10
struct kvm_mp_state {
__u32 mp_state;
@ -1152,6 +1155,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_DISABLE_QUIRKS2 213
/* #define KVM_CAP_VM_TSC_CONTROL 214 */
#define KVM_CAP_SYSTEM_EVENT_DATA 215
#define KVM_CAP_ARM_SYSTEM_SUSPEND 216
#ifdef KVM_CAP_IRQ_ROUTING

167
tools/testing/selftests/kvm/aarch64/psci_test.c
View File

@ -45,11 +45,83 @@ static uint64_t psci_affinity_info(uint64_t target_affinity,
return res.a0;
}
static void guest_main(uint64_t target_cpu)
static uint64_t psci_system_suspend(uint64_t entry_addr, uint64_t context_id)
{
struct arm_smccc_res res;
smccc_hvc(PSCI_1_0_FN64_SYSTEM_SUSPEND, entry_addr, context_id,
0, 0, 0, 0, 0, &res);
return res.a0;
}
static uint64_t psci_features(uint32_t func_id)
{
struct arm_smccc_res res;
smccc_hvc(PSCI_1_0_FN_PSCI_FEATURES, func_id, 0, 0, 0, 0, 0, 0, &res);
return res.a0;
}
static void vcpu_power_off(struct kvm_vm *vm, uint32_t vcpuid)
{
struct kvm_mp_state mp_state = {
.mp_state = KVM_MP_STATE_STOPPED,
};
vcpu_set_mp_state(vm, vcpuid, &mp_state);
}
static struct kvm_vm *setup_vm(void *guest_code)
{
struct kvm_vcpu_init init;
struct kvm_vm *vm;
vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
kvm_vm_elf_load(vm, program_invocation_name);
ucall_init(vm, NULL);
vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init);
init.features[0] |= (1 << KVM_ARM_VCPU_PSCI_0_2);
aarch64_vcpu_add_default(vm, VCPU_ID_SOURCE, &init, guest_code);
aarch64_vcpu_add_default(vm, VCPU_ID_TARGET, &init, guest_code);
return vm;
}
static void enter_guest(struct kvm_vm *vm, uint32_t vcpuid)
{
struct ucall uc;
vcpu_run(vm, vcpuid);
if (get_ucall(vm, vcpuid, &uc) == UCALL_ABORT)
TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0], __FILE__,
uc.args[1]);
}
static void assert_vcpu_reset(struct kvm_vm *vm, uint32_t vcpuid)
{
uint64_t obs_pc, obs_x0;
get_reg(vm, vcpuid, ARM64_CORE_REG(regs.pc), &obs_pc);
get_reg(vm, vcpuid, ARM64_CORE_REG(regs.regs[0]), &obs_x0);
TEST_ASSERT(obs_pc == CPU_ON_ENTRY_ADDR,
"unexpected target cpu pc: %lx (expected: %lx)",
obs_pc, CPU_ON_ENTRY_ADDR);
TEST_ASSERT(obs_x0 == CPU_ON_CONTEXT_ID,
"unexpected target context id: %lx (expected: %lx)",
obs_x0, CPU_ON_CONTEXT_ID);
}
static void guest_test_cpu_on(uint64_t target_cpu)
{
GUEST_ASSERT(!psci_cpu_on(target_cpu, CPU_ON_ENTRY_ADDR, CPU_ON_CONTEXT_ID));
uint64_t target_state;
GUEST_ASSERT(!psci_cpu_on(target_cpu, CPU_ON_ENTRY_ADDR, CPU_ON_CONTEXT_ID));
do {
target_state = psci_affinity_info(target_cpu, 0);
@ -60,53 +132,82 @@ static void guest_main(uint64_t target_cpu)
GUEST_DONE();
}
int main(void)
static void host_test_cpu_on(void)
{
uint64_t target_mpidr, obs_pc, obs_x0;
struct kvm_vcpu_init init;
uint64_t target_mpidr;
struct kvm_vm *vm;
struct ucall uc;
vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
kvm_vm_elf_load(vm, program_invocation_name);
ucall_init(vm, NULL);
vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init);
init.features[0] |= (1 << KVM_ARM_VCPU_PSCI_0_2);
aarch64_vcpu_add_default(vm, VCPU_ID_SOURCE, &init, guest_main);
vm = setup_vm(guest_test_cpu_on);
/*
* make sure the target is already off when executing the test.
*/
init.features[0] |= (1 << KVM_ARM_VCPU_POWER_OFF);
aarch64_vcpu_add_default(vm, VCPU_ID_TARGET, &init, guest_main);
vcpu_power_off(vm, VCPU_ID_TARGET);
get_reg(vm, VCPU_ID_TARGET, KVM_ARM64_SYS_REG(SYS_MPIDR_EL1), &target_mpidr);
vcpu_args_set(vm, VCPU_ID_SOURCE, 1, target_mpidr & MPIDR_HWID_BITMASK);
vcpu_run(vm, VCPU_ID_SOURCE);
enter_guest(vm, VCPU_ID_SOURCE);
switch (get_ucall(vm, VCPU_ID_SOURCE, &uc)) {
case UCALL_DONE:
break;
case UCALL_ABORT:
TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0], __FILE__,
uc.args[1]);
break;
default:
if (get_ucall(vm, VCPU_ID_SOURCE, &uc) != UCALL_DONE)
TEST_FAIL("Unhandled ucall: %lu", uc.cmd);
}
get_reg(vm, VCPU_ID_TARGET, ARM64_CORE_REG(regs.pc), &obs_pc);
get_reg(vm, VCPU_ID_TARGET, ARM64_CORE_REG(regs.regs[0]), &obs_x0);
assert_vcpu_reset(vm, VCPU_ID_TARGET);
kvm_vm_free(vm);
}
TEST_ASSERT(obs_pc == CPU_ON_ENTRY_ADDR,
"unexpected target cpu pc: %lx (expected: %lx)",
obs_pc, CPU_ON_ENTRY_ADDR);
TEST_ASSERT(obs_x0 == CPU_ON_CONTEXT_ID,
"unexpected target context id: %lx (expected: %lx)",
obs_x0, CPU_ON_CONTEXT_ID);
static void enable_system_suspend(struct kvm_vm *vm)
{
struct kvm_enable_cap cap = {
.cap = KVM_CAP_ARM_SYSTEM_SUSPEND,
};
vm_enable_cap(vm, &cap);
}
static void guest_test_system_suspend(void)
{
uint64_t ret;
/* assert that SYSTEM_SUSPEND is discoverable */
GUEST_ASSERT(!psci_features(PSCI_1_0_FN_SYSTEM_SUSPEND));
GUEST_ASSERT(!psci_features(PSCI_1_0_FN64_SYSTEM_SUSPEND));
ret = psci_system_suspend(CPU_ON_ENTRY_ADDR, CPU_ON_CONTEXT_ID);
GUEST_SYNC(ret);
}
static void host_test_system_suspend(void)
{
struct kvm_run *run;
struct kvm_vm *vm;
vm = setup_vm(guest_test_system_suspend);
enable_system_suspend(vm);
vcpu_power_off(vm, VCPU_ID_TARGET);
run = vcpu_state(vm, VCPU_ID_SOURCE);
enter_guest(vm, VCPU_ID_SOURCE);
TEST_ASSERT(run->exit_reason == KVM_EXIT_SYSTEM_EVENT,
"Unhandled exit reason: %u (%s)",
run->exit_reason, exit_reason_str(run->exit_reason));
TEST_ASSERT(run->system_event.type == KVM_SYSTEM_EVENT_SUSPEND,
"Unhandled system event: %u (expected: %u)",
run->system_event.type, KVM_SYSTEM_EVENT_SUSPEND);
kvm_vm_free(vm);
}
int main(void)
{
if (!kvm_check_cap(KVM_CAP_ARM_SYSTEM_SUSPEND)) {
print_skip("KVM_CAP_ARM_SYSTEM_SUSPEND not supported");
exit(KSFT_SKIP);
}
host_test_cpu_on();
host_test_system_suspend();
return 0;
}