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[v9,0/3] RISC-V: KVM: Validate SBI STA shmem alignment

Message ID 20260228005355.823048-1-xujiakai2025@iscas.ac.cn
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Series RISC-V: KVM: Validate SBI STA shmem alignment | expand

Message

Jiakai Xu Feb. 28, 2026, 12:53 a.m. UTC 
This series fixes a missing validation in the RISC-V KVM SBI
steal-time accounting (STA) register handling.

Patch 1 validates the configured SBI STA shared memory GPA at
KVM_SET_ONE_REG, enforcing the 64-byte alignment requirement
defined by the SBI specification or allowing INVALID_GPA to explicitly
disable steal-time accounting. This prevents invalid userspace state
from reaching runtime code paths and avoids WARN_ON() triggers during
KVM_RUN.

Patch 2 refactors existing UAPI tests from steal_time_init() into
a dedicated check_steal_time_uapi() function for better code organization,
and adds an empty stub for RISC-V.

Patch 3 fills in the RISC-V stub with tests that verify KVM correctly
enforces the STA alignment requirements.

Jiakai Xu (3):
  RISC-V: KVM: Validate SBI STA shmem alignment in 
    kvm_sbi_ext_sta_set_reg()
  KVM: selftests: Refactor UAPI tests into dedicated function
  RISC-V: KVM: selftests: Add RISC-V SBI STA shmem alignment tests

 arch/riscv/kvm/vcpu_sbi_sta.c                 | 16 ++-
 .../selftests/kvm/include/kvm_util_types.h    |  2 +
 tools/testing/selftests/kvm/steal_time.c      | 98 ++++++++++++++++---
 3 files changed, 95 insertions(+), 21 deletions(-)