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Tue, 30 Jun 2026 19:08:27 -0700 (PDT) From: Inochi Amaoto To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Anup Patel , Atish Patra , Paolo Bonzini , Shuah Khan , Thomas Huth , Sergey Matyukevich , Inochi Amaoto , Andy Chiu , Deepak Gupta Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org, Yixun Lan , Longbin Li , Quan Zhou Subject: [PATCH v4 5/8] RISC-V: KVM: Handle software-check exits for VCPU Date: Wed, 1 Jul 2026 10:07:42 +0800 Message-ID: <20260701020746.170157-6-inochiama@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260701020746.170157-1-inochiama@gmail.com> References: <20260701020746.170157-1-inochiama@gmail.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The extension Zicfiss/Zicfilp introduces a software-check exception to the privilege architecture. Delegate this exception to VS mode when vCPU enable Zicfiss/Zicfilp so the CFI violations in VU/VS could be reported. Assisted-by: YuanSheng:claude-4.7-opus Co-developed-by: Quan Zhou Signed-off-by: Quan Zhou Signed-off-by: Inochi Amaoto --- arch/riscv/include/asm/csr.h | 1 + arch/riscv/kvm/vcpu_exit.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 31b8988f4488..224af9facf1f 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -117,6 +117,7 @@ #define EXC_INST_PAGE_FAULT 12 #define EXC_LOAD_PAGE_FAULT 13 #define EXC_STORE_PAGE_FAULT 15 +#define EXC_SOFTWARE_CHECK 18 #define EXC_INST_GUEST_PAGE_FAULT 20 #define EXC_LOAD_GUEST_PAGE_FAULT 21 #define EXC_VIRTUAL_INST_FAULT 22 diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c index 0bb0c51e3c89..12eebeabdf14 100644 --- a/arch/riscv/kvm/vcpu_exit.c +++ b/arch/riscv/kvm/vcpu_exit.c @@ -243,6 +243,10 @@ int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, run->exit_reason = KVM_EXIT_DEBUG; ret = 0; break; + case EXC_SOFTWARE_CHECK: + if (vcpu->arch.cfg.henvcfg & (ENVCFG_LPE | ENVCFG_SSE)) + ret = vcpu_redirect(vcpu, trap); + break; default: break; } -- 2.55.0