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| author | Jiakai Xu <xujiakai2025@iscas.ac.cn> | 2026-03-03 04:08:59 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2026-03-26 18:51:03 +0300 |
| commit | 7c61e7433b49ca948dc8cc2b70a20b3dbc36363d (patch) | |
| tree | 9adc48ec74a0cdb930823004d0b16d2c6c7d0d5b /tools/testing | |
| parent | 40351ed924dd30ded1b43c7333ce695a4a835f7b (diff) | |
| download | linux-7c61e7433b49ca948dc8cc2b70a20b3dbc36363d.tar.xz | |
RISC-V: KVM: selftests: Add RISC-V SBI STA shmem alignment tests
Add RISC-V KVM selftests to verify the SBI Steal-Time Accounting (STA)
shared memory alignment requirements.
The SBI specification requires the STA shared memory GPA to be 64-byte
aligned, or set to all-ones to explicitly disable steal-time accounting.
This test verifies that KVM enforces the expected behavior when
configuring the SBI STA shared memory via KVM_SET_ONE_REG.
Specifically, the test checks that:
- misaligned GPAs are rejected with -EINVAL
- 64-byte aligned GPAs are accepted
- all-ones GPA is accepted
Signed-off-by: Jiakai Xu <xujiakai2025@iscas.ac.cn>
Signed-off-by: Jiakai Xu <jiakaiPeanut@gmail.com>
Reviewed-by: Andrew Jones <andrew.jones@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260303010859.1763177-4-xujiakai2025@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/kvm/include/kvm_util_types.h | 2 | ||||
| -rw-r--r-- | tools/testing/selftests/kvm/steal_time.c | 31 |
2 files changed, 33 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/include/kvm_util_types.h b/tools/testing/selftests/kvm/include/kvm_util_types.h index ec787b97cf18..0366e9bce7f9 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_types.h +++ b/tools/testing/selftests/kvm/include/kvm_util_types.h @@ -17,4 +17,6 @@ typedef uint64_t vm_paddr_t; /* Virtual Machine (Guest) physical address */ typedef uint64_t vm_vaddr_t; /* Virtual Machine (Guest) virtual address */ +#define INVALID_GPA (~(uint64_t)0) + #endif /* SELFTEST_KVM_UTIL_TYPES_H */ diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selftests/kvm/steal_time.c index 8e4d7c13b598..efe56a10d13e 100644 --- a/tools/testing/selftests/kvm/steal_time.c +++ b/tools/testing/selftests/kvm/steal_time.c @@ -332,6 +332,37 @@ static void steal_time_dump(struct kvm_vm *vm, uint32_t vcpu_idx) static void check_steal_time_uapi(void) { + struct kvm_vm *vm; + struct kvm_vcpu *vcpu; + struct kvm_one_reg reg; + uint64_t shmem; + int ret; + + vm = vm_create_with_one_vcpu(&vcpu, NULL); + + reg.id = KVM_REG_RISCV | + KVM_REG_SIZE_ULONG | + KVM_REG_RISCV_SBI_STATE | + KVM_REG_RISCV_SBI_STA | + KVM_REG_RISCV_SBI_STA_REG(shmem_lo); + reg.addr = (uint64_t)&shmem; + + shmem = ST_GPA_BASE + 1; + ret = __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, ®); + TEST_ASSERT(ret == -1 && errno == EINVAL, + "misaligned STA shmem returns -EINVAL"); + + shmem = ST_GPA_BASE; + ret = __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, ®); + TEST_ASSERT(ret == 0, + "aligned STA shmem succeeds"); + + shmem = INVALID_GPA; + ret = __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, ®); + TEST_ASSERT(ret == 0, + "all-ones for STA shmem succeeds"); + + kvm_vm_free(vm); } #elif defined(__loongarch__) |