[PW_SID:1125685] RISC-V: KVM: fix vcpu vector context handling by linux-riscv-bot · Pull Request #2261 · linux-riscv/linux

linux-riscv-bot · 2026-07-11T05:03:49Z

PR for series 1125685 applied to workflow__riscv__fixes

Name: RISC-V: KVM: fix vcpu vector context handling
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1125685
Version: 1

Refactor riscv_v_start_kernel_context() to drop `is_nested` variable and simplify the logic. This introduces no functional change and works as a preparatory patch for the kernel-mode vector fix. Signed-off-by: Andy Chiu <tchiu@tenstorrent.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Running vector workloads like perf + mcf on KVM can result in an unexpected termination due to a vtype corruption. This happens because the kernel-mode vector (KMV) misattributes the guest's vcpu context as the user's context and source from a wrong status.VS. The simplified call chain that results in this problem is shown as follow: __riscv_sys_ioctl() kvm_arch_vcpu_ioctl_run() kvm_riscv_vcpu_exit() kvm_riscv_vcpu_sbi_ecall() kvm_riscv_vcpu_pmu_ctr_stop() kvm_vcpu_write_guest() __copy_to_user() enter_vector_usercopy() kernel_vector_begin() kernel_vector_begin() should use the sstatus.VS from guest's vcpu context instead of task_pt_reg(current). Also, it should not save guest's v-reg into the user's context memory. To resolve this, the vcpu context must be correctly saved when KMV is serving a guest. However, invoking KVM functions directly from generic RISC-V architecture code introduces a reverse dependency, breaking builds when KVM is configured as N or M. Address this by registering an RCU-protected callback for context flushing. KVM registers this callback at module initialization and unregisters it on exit. When KMV starts a kernel context, it can now safely flush the vector context via the callback. Fixes: ecd2ada ("riscv: Add support for kernel mode vector") Signed-off-by: Andy Chiu <tchiu@tenstorrent.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot · 2026-07-11T05:09:25Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 142.20 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T05:33:33Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1446.38 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:02:16Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1721.83 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:02:45Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 26.83 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:03:14Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 27.84 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:03:16Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.80 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:04:46Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 88.32 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:04:48Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:04:50Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
kdoc
Desc: Detects for kdoc errors
Duration: 0.84 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:04:52Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
module-param
Desc: Detect module_param changes
Duration: 0.26 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:04:53Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:04:55Z

Patch 1: "[v1,1/2] riscv: vector: refactor riscv_v_start_kernel_context"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.32 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:07:33Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 142.46 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T06:47:28Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 2393.75 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:38:44Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 3073.98 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:39:12Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 26.47 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:39:41Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 28.00 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:39:44Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 1.96 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:41:14Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 88.29 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:41:16Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.26 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:41:18Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
kdoc
Desc: Detects for kdoc errors
Duration: 0.94 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:41:20Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
module-param
Desc: Detect module_param changes
Duration: 0.27 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:41:22Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.29 seconds
Result: PASS

linux-riscv-bot · 2026-07-11T07:41:23Z

Patch 2: "[v1,2/2] RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.32 seconds
Result: PASS

Linux RISC-V bot and others added 3 commits July 11, 2026 01:54

Adding CI files

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linux-riscv-bot force-pushed the workflow__riscv__fixes branch 3 times, most recently from f54dc6c to f61148d Compare July 15, 2026 03:51

linux-riscv-bot closed this Jul 15, 2026

linux-riscv-bot deleted the pw1125685 branch July 15, 2026 06:16

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