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KVM: LoongArch: selftests: Add SW emulated timer test case

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This test case setup one-shot timer and execute idle instruction
immediately to indicate giving up CPU, hypervisor will emulate SW
hrtimer and wakeup vCPU when SW hrtimer is fired.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao 2025-11-28 14:49:47 +08:00 committed by Huacai Chen
parent df41742343
commit 4e88240940
1 changed files with 40 additions and 0 deletions
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40
tools/testing/selftests/kvm/loongarch/arch_timer.c
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@ -9,6 +9,21 @@
#include "timer_test.h"
#include "ucall_common.h"
static void do_idle(void)
{
unsigned int intid;
unsigned long estat;
__asm__ __volatile__("idle 0" : : : "memory");
estat = csr_read(LOONGARCH_CSR_ESTAT);
intid = !!(estat & BIT(INT_TI));
/* Make sure pending timer IRQ arrived */
GUEST_ASSERT_EQ(intid, 1);
csr_write(CSR_TINTCLR_TI, LOONGARCH_CSR_TINTCLR);
}
static void guest_irq_handler(struct ex_regs *regs)
{
unsigned int intid;
@ -97,6 +112,30 @@ static void guest_test_oneshot_timer(uint32_t cpu)
}
}
static void guest_test_emulate_timer(uint32_t cpu)
{
uint32_t config_iter;
uint64_t xcnt_diff_us, us;
struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
local_irq_disable();
shared_data->nr_iter = 0;
us = msecs_to_usecs(test_args.timer_period_ms);
for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
shared_data->xcnt = timer_get_cycles();
/* Setup the next interrupt */
timer_set_next_cmp_ms(test_args.timer_period_ms, false);
do_idle();
xcnt_diff_us = cycles_to_usec(timer_get_cycles() - shared_data->xcnt);
__GUEST_ASSERT(xcnt_diff_us >= us,
"xcnt_diff_us = 0x%lx, us = 0x%lx.\n",
xcnt_diff_us, us);
}
local_irq_enable();
}
static void guest_code(void)
{
uint32_t cpu = guest_get_vcpuid();
@ -105,6 +144,7 @@ static void guest_code(void)
local_irq_enable();
guest_test_period_timer(cpu);
guest_test_oneshot_timer(cpu);
guest_test_emulate_timer(cpu);
GUEST_DONE();
}