On Wed, Sep 13, 2023 at 10:10 PM Mayuresh Chitale <mchitale@xxxxxxxxxxxxxxxx> wrote: > > This series adds support to detect the Smstateen extension for both, the > host and the guest vcpu. It also adds senvcfg and sstateen0 to the ONE_REG > interface and the vcpu context save/restore. > > The motivation behind Smstateen from the spec > (https://github.com/riscv/riscv-state-enable): > "The implementation of optional RISC-V extensions has the potential to open > covert channels between separate user threads, or between separate guest OSes > running under a hypervisor. The problem occurs when an extension adds processor > state---usually explicit registers, but possibly other forms of state---that > the main OS or hypervisor is unaware of (and hence won’t context-switch) but > that can be modified/written by one user thread or guest OS and perceived/ > examined/read by another." > > Changes in v5: > - Rebased on latest linux master > > Changes in v4: > - Update commit description for patch 1 > - Rebase to kvm_riscv_queue > - Add reviewed-by tag > > Changes in v3: > - Move DT bindings change to a separate patch > - Move senvcfg/sstateen0 save/restore to separate function > > Changes in v2: > - Add smstaeen description in riscv/extensions.yaml > - Avoid line wrap at 80 chars > > Mayuresh Chitale (7): > RISC-V: Detect Smstateen extension > dt-bindings: riscv: Add smstateen entry > RISC-V: KVM: Add kvm_vcpu_config > RISC-V: KVM: Enable Smstateen accesses > RISCV: KVM: Add senvcfg context save/restore > RISCV: KVM: Add sstateen0 context save/restore > RISCV: KVM: Add sstateen0 to ONE_REG Queued this series for Linux-6.7 Thanks, Anup > > .../devicetree/bindings/riscv/extensions.yaml | 6 ++ > arch/riscv/include/asm/csr.h | 18 +++++ > arch/riscv/include/asm/hwcap.h | 1 + > arch/riscv/include/asm/kvm_host.h | 18 +++++ > arch/riscv/include/uapi/asm/kvm.h | 10 +++ > arch/riscv/kernel/cpufeature.c | 1 + > arch/riscv/kvm/vcpu.c | 70 +++++++++++++++---- > arch/riscv/kvm/vcpu_onereg.c | 41 +++++++++++ > 8 files changed, 152 insertions(+), 13 deletions(-) > > -- > 2.34.1 > > > -- > kvm-riscv mailing list > kvm-riscv@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/kvm-riscv
