From: Jiakai Xu Date: Tue, 3 Mar 2026 01:08:59 +0000 (+0000) Subject: RISC-V: KVM: selftests: Add RISC-V SBI STA shmem alignment tests X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c61e7433b49ca948dc8cc2b70a20b3dbc36363d;p=thirdparty%2Fkernel%2Flinux.git 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 Signed-off-by: Jiakai Xu Reviewed-by: Andrew Jones Link: https://lore.kernel.org/r/20260303010859.1763177-4-xujiakai2025@iscas.ac.cn Signed-off-by: Anup Patel --- diff --git a/tools/testing/selftests/kvm/include/kvm_util_types.h b/tools/testing/selftests/kvm/include/kvm_util_types.h index ec787b97cf184..0366e9bce7f93 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 8e4d7c13b5986..efe56a10d13e8 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__)