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(unknown [210.73.43.101]) by APP-03 (Coremail) with SMTP id rQCowACXt97A7INpzKW1Bw--.43975S4; Thu, 05 Feb 2026 09:05:05 +0800 (CST) From: Jiakai Xu To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Andrew Jones , Paolo Bonzini , Shuah Khan , Jiakai Xu , Jiakai Xu Subject: [PATCH v6 2/2] RISC-V: KVM: selftests: Add RISC-V SBI STA shmem alignment tests Date: Thu, 5 Feb 2026 01:05:02 +0000 Message-Id: <20260205010502.2554381-3-xujiakai2025@iscas.ac.cn> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260205010502.2554381-1-xujiakai2025@iscas.ac.cn> References: <20260205010502.2554381-1-xujiakai2025@iscas.ac.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: rQCowACXt97A7INpzKW1Bw--.43975S4 X-Coremail-Antispam: 1UD129KBjvJXoWxCr1fKw17CF15CrWfXrW3Awb_yoW5trW5pF WkCwn0vFW8KFWxt34xKr1vqF4Fg3ykKr4vvrWxu3yrAF4xtrWxJrsrKFyDZ34DWrZ5X3WS vFyIgF4Uua1UXa7anT9S1TB71UUUUUJqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUHE14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jryl82xGYIkIc2 x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Cr0_Gr1UM2 8EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Cr1j6rxd M2kKe7AKxVWUXVWUAwAac4AC62xK8xCEY4vEwIxC4wAS0I0E0xvYzxvE52x082IY62kv04 87Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUXVWUAwAv7VC2z280 aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67 IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2kIc2xKxwCY1x0262kKe7AKxVW8ZVWr XwCY02Avz4vE14v_KwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s 026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_ GFv_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUCVW8JwCI42IY6xIIjxv20x vEc7CjxVAFwI0_Cr0_Gr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv 67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyT uYvjTRu89NDUUUU X-CM-SenderInfo: 50xmxthndljiysv6x2xfdvhtffof0/1tbiDAcJCWmD6tsHtgAAsh Content-Type: text/plain; charset="utf-8" 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 - INVALID_GPA correctly disables steal-time accounting Signed-off-by: Jiakai Xu Signed-off-by: Jiakai Xu --- .../selftests/kvm/include/riscv/processor.h | 4 +++ tools/testing/selftests/kvm/steal_time.c | 33 +++++++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/tools/testing/selftests/kvm/include/riscv/processor.h b/tools/= testing/selftests/kvm/include/riscv/processor.h index e58282488beb3..c3551d129d2f6 100644 --- a/tools/testing/selftests/kvm/include/riscv/processor.h +++ b/tools/testing/selftests/kvm/include/riscv/processor.h @@ -62,6 +62,10 @@ static inline uint64_t __kvm_reg_id(uint64_t type, uint6= 4_t subtype, KVM_REG_RISCV_SBI_SINGLE, \ idx, KVM_REG_SIZE_ULONG) =20 +#define RISCV_SBI_STA_REG(idx) __kvm_reg_id(KVM_REG_RISCV_SBI_STATE, \ + KVM_REG_RISCV_SBI_STA, \ + idx, KVM_REG_SIZE_ULONG) + bool __vcpu_has_ext(struct kvm_vcpu *vcpu, uint64_t ext); =20 static inline bool __vcpu_has_isa_ext(struct kvm_vcpu *vcpu, uint64_t isa_= ext) diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selft= ests/kvm/steal_time.c index 8edc1fca345ba..30b98d1b601c3 100644 --- a/tools/testing/selftests/kvm/steal_time.c +++ b/tools/testing/selftests/kvm/steal_time.c @@ -209,6 +209,7 @@ static void steal_time_dump(struct kvm_vm *vm, uint32_t= vcpu_idx) =20 /* SBI STA shmem must have 64-byte alignment */ #define STEAL_TIME_SIZE ((sizeof(struct sta_struct) + 63) & ~63) +#define INVALID_GPA (~(u64)0) =20 static vm_paddr_t st_gpa[NR_VCPUS]; =20 @@ -301,6 +302,34 @@ static void steal_time_dump(struct kvm_vm *vm, uint32_= t vcpu_idx) pr_info("\n"); } =20 +static void test_riscv_sta_shmem_alignment(struct kvm_vcpu *vcpu) +{ + struct kvm_one_reg reg; + uint64_t shmem; + int ret; + + reg.id =3D RISCV_SBI_STA_REG(0); + reg.addr =3D (uint64_t)&shmem; + + /* Case 1: misaligned GPA */ + shmem =3D ST_GPA_BASE + 1; + ret =3D __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, ®); + TEST_ASSERT(ret =3D=3D -1 && errno =3D=3D EINVAL, + "misaligned STA shmem should return -EINVAL"); + + /* Case 2: 64-byte aligned GPA */ + shmem =3D ST_GPA_BASE; + ret =3D __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, ®); + TEST_ASSERT(ret =3D=3D 0, + "aligned STA shmem should succeed"); + + /* Case 3: INVALID_GPA disables STA */ + shmem =3D INVALID_GPA; + ret =3D __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, ®); + TEST_ASSERT(ret =3D=3D 0, + "INVALID_GPA should disable STA successfully"); +} + #endif =20 static void *do_steal_time(void *arg) @@ -369,6 +398,10 @@ int main(int ac, char **av) TEST_REQUIRE(is_steal_time_supported(vcpus[0])); ksft_set_plan(NR_VCPUS); =20 +#ifdef __riscv + test_riscv_sta_shmem_alignment(vcpus[0]); +#endif + /* Run test on each VCPU */ for (i =3D 0; i < NR_VCPUS; ++i) { steal_time_init(vcpus[i], i); --=20 2.34.1