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KVM: LoongArch: selftests: Add time counter test case

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With time counter test, it is to verify that time count starts from 0
and always grows up then.

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 14:49:48 +08:00
committed by Huacai Chen
parent 4e88240940
commit 0f90fa6e2e
2 changed files with 39 additions and 0 deletions
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9
tools/testing/selftests/kvm/lib/loongarch/processor.c
View File

@@ -3,6 +3,7 @@
#include <assert.h>
#include <linux/compiler.h>
#include <asm/kvm.h>
#include "kvm_util.h"
#include "processor.h"
#include "ucall_common.h"
@@ -245,6 +246,11 @@ void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
vcpu_regs_set(vcpu, &regs);
}
static void loongarch_set_reg(struct kvm_vcpu *vcpu, uint64_t id, uint64_t val)
{
__vcpu_set_reg(vcpu, id, val);
}
static void loongarch_get_csr(struct kvm_vcpu *vcpu, uint64_t id, void *addr)
{
uint64_t csrid;
@@ -285,7 +291,10 @@ static void loongarch_vcpu_setup(struct kvm_vcpu *vcpu)
loongarch_set_csr(vcpu, LOONGARCH_CSR_TCFG, 0);
loongarch_set_csr(vcpu, LOONGARCH_CSR_ASID, 1);
/* time count start from 0 */
val = 0;
loongarch_set_reg(vcpu, KVM_REG_LOONGARCH_COUNTER, val);
width = vm->page_shift - 3;
switch (vm->pgtable_levels) {

30
tools/testing/selftests/kvm/loongarch/arch_timer.c
View File

@@ -136,10 +136,40 @@ static void guest_test_emulate_timer(uint32_t cpu)
local_irq_enable();
}
static void guest_time_count_test(uint32_t cpu)
{
uint32_t config_iter;
unsigned long start, end, prev, us;
/* Assuming that test case starts to run in 1 second */
start = timer_get_cycles();
us = msec_to_cycles(1000);
__GUEST_ASSERT(start <= us,
"start = 0x%lx, us = 0x%lx.\n",
start, us);
us = msec_to_cycles(test_args.timer_period_ms);
for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
start = timer_get_cycles();
end = start + us;
/* test time count growing up always */
while (start < end) {
prev = start;
start = timer_get_cycles();
__GUEST_ASSERT(prev <= start,
"prev = 0x%lx, start = 0x%lx.\n",
prev, start);
}
}
}
static void guest_code(void)
{
uint32_t cpu = guest_get_vcpuid();
/* must run at first */
guest_time_count_test(cpu);
timer_irq_enable();
local_irq_enable();
guest_test_period_timer(cpu);