linux-kernel - [PATCH v6 0/2] RISC-V: KVM: Validate SBI STA shmem alignment

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Message-Id: <20260205010502.2554381-1-xujiakai2025@iscas.ac.cn>
Date: Thu,  5 Feb 2026 01:05:00 +0000
From: Jiakai Xu <xujiakai2025@...as.ac.cn>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-kselftest@...r.kernel.org
Cc: Anup Patel <anup@...infault.org>,
	Atish Patra <atish.patra@...ux.dev>,
	Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Andrew Jones <ajones@...tanamicro.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Shuah Khan <shuah@...nel.org>,
	Jiakai Xu <xujiakai2025@...as.ac.cn>
Subject: [PATCH v6 0/2] RISC-V: KVM: Validate SBI STA shmem alignment

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 adds RISC-V KVM selftests to verify the expected behavior,
ensuring that misaligned GPAs are rejected, aligned GPAs are accepted,
and INVALID_GPA correctly disables steal-time accounting.

Jiakai Xu (2):
  RISC-V: KVM: Validate SBI STA shmem alignment in 
    kvm_sbi_ext_sta_set_reg()
  RISC-V: KVM: selftests: Add RISC-V SBI STA shmem alignment tests

 arch/riscv/kvm/vcpu_sbi_sta.c                 | 16 ++++++---
 .../selftests/kvm/include/riscv/processor.h   |  4 +++
 tools/testing/selftests/kvm/steal_time.c      | 33 +++++++++++++++++++
 3 files changed, 48 insertions(+), 5 deletions(-)

-- 
2.34.1