linux-dev/arch/riscv/kvm, branch master

RISC-V: KVM: Fix kvm_riscv_vcpu_timer_pending() for Sstc

2022-10-21T06:22:45Z

The kvm_riscv_vcpu_timer_pending() checks per-VCPU next_cycles and per-VCPU software injected VS timer interrupt. This function returns incorrect value when Sstc is available because the per-VCPU next_cycles are only updated by kvm_riscv_vcpu_timer_save() called from kvm_arch_vcpu_put(). As a result, when Sstc is available the VCPU does not block properly upon WFI traps. To fix the above issue, we introduce kvm_riscv_vcpu_timer_sync() which will update per-VCPU next_cycles upon every VM exit instead of kvm_riscv_vcpu_timer_save(). Fixes: 8f5cb44b1bae ("RISC-V: KVM: Support sstc extension") Signed-off-by: Anup Patel Reviewed-by: Atish Patra Signed-off-by: Anup Patel

Merge tag 'kvm-riscv-6.1-1' of https://github.com/kvm-riscv/linux into HEAD

2022-10-03T19:33:43Z

KVM/riscv changes for 6.1 - Improved instruction encoding infrastructure for instructions not yet supported by binutils - Svinval support for both KVM Host and KVM Guest - Zihintpause support for KVM Guest - Zicbom support for KVM Guest - Record number of signal exits as a VCPU stat - Use generic guest entry infrastructure

RISC-V: KVM: Use generic guest entry infrastructure

2022-10-02T04:49:25Z

Use generic guest entry infrastructure to properly handle TIF_NOTIFY_RESUME. Signed-off-by: Jisheng Zhang Reviewed-by: Andrew Jones Signed-off-by: Anup Patel

RISC-V: KVM: Record number of signal exits as a vCPU stat

2022-10-02T04:49:16Z

Record a statistic indicating the number of times a vCPU has exited due to a pending signal. Signed-off-by: Jisheng Zhang Reviewed-by: Guo Ren Reviewed-by: Andrew Jones Signed-off-by: Anup Patel

RISC-V: KVM: add __init annotation to riscv_kvm_init()

2022-10-02T04:49:11Z

The riscv_kvm_init() is a module_init entry so let us add __init annotation to it. Signed-off-by: Xiu Jianfeng Signed-off-by: Anup Patel

RISC-V: KVM: Expose Zicbom to the guest

2022-10-02T04:49:05Z

Guests may use the cbo.inval,clean,flush instructions when the CPU has the Zicbom extension and the hypervisor sets henvcfg.CBIE (for cbo.inval) and henvcfg.CBCFE (for cbo.clean,flush). Add Zicbom support for KVM guests which may be enabled and disabled from KVM userspace using the ISA extension ONE_REG API. Also opportunistically switch the other isa extension checks in kvm_riscv_vcpu_update_config() to riscv_isa_extension_available(). Signed-off-by: Andrew Jones Reviewed-by: Conor Dooley Reviewed-by: Atish Patra Signed-off-by: Anup Patel

RISC-V: KVM: Provide UAPI for Zicbom block size

2022-10-02T04:48:59Z

We're about to allow guests to use the Zicbom extension. KVM userspace needs to know the cache block size in order to properly advertise it to the guest. Provide a virtual config register for userspace to get it with the GET_ONE_REG API, but setting it cannot be supported, so disallow SET_ONE_REG. Signed-off-by: Andrew Jones Reviewed-by: Conor Dooley Reviewed-by: Atish Patra Signed-off-by: Anup Patel

RISC-V: KVM: Make ISA ext mappings explicit

2022-10-02T04:48:54Z

While adding new extensions at the bottom of the array isn't hard to do, it's a pain to review in order to ensure we're not missing any. Also, resolving merge conflicts for multiple new ISA extensions can be error-prone. To make adding new mappings foolproof, explicitly assign the array elements. And, now that the order doesn't matter, we can alphabetize the extensions, so we do that too. Signed-off-by: Andrew Jones Signed-off-by: Anup Patel

RISC-V: KVM: Allow Guest use Zihintpause extension

2022-10-02T04:48:48Z

We should advertise Zihintpause ISA extension to KVM user-space whenever host supports it. This will allow KVM user-space (i.e. QEMU or KVMTOOL) to pass on this information to Guest via ISA string. Signed-off-by: Mayuresh Chitale Reviewed-by: Andrew Jones Signed-off-by: Anup Patel

RISC-V: KVM: Allow Guest use Svinval extension

2022-10-02T04:48:42Z

We should advertise Svinval ISA extension to KVM user-space whenever host supports it. This will allow KVM user-space (i.e. QEMU or KVMTOOL) to pass on this information to Guest via ISA string. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones Signed-off-by: Anup Patel