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Subject[PATCH v10 00/19] KVM RISC-V Support
This series adds initial KVM RISC-V support. Currently, we are able to boot
RISC-V 64bit Linux Guests with multiple VCPUs.

Few key aspects of KVM RISC-V added by this series are:
1. Minimal possible KVM world-switch which touches only GPRs and few CSRs.
2. Full Guest/VM switch is done via vcpu_get/vcpu_put infrastructure.
3. KVM ONE_REG interface for VCPU register access from user-space.
4. PLIC emulation is done in user-space.
5. Timer and IPI emuation is done in-kernel.
6. MMU notifiers supported.
7. FP lazy save/restore supported.
8. SBI v0.1 emulation for KVM Guest available.
9. Forward unhandled SBI calls to KVM userspace.
10. Hugepage support for Guest/VM

Here's a brief TODO list which we will work upon after this series:
1. SBI v0.2 emulation in-kernel
2. SBI v0.2 hart state management emulation in-kernel
3. In-kernel PLIC emulation
4. ..... and more .....

This series can be found in riscv_kvm_v10 branch at:

Our work-in-progress KVMTOOL RISC-V port can be found in riscv_v1 branch
at: https//

The QEMU RISC-V hypervisor emulation is done by Alistair and is available
in mainline/alistair/riscv-hyp-ext-v0.5.1 branch at:

To play around with KVM RISC-V, refer KVM RISC-V wiki at:

Changes since v9:
- Squash PATCH19 and PATCH20 into PATCH5
- Squash PATCH18 into PATCH11
- Squash PATCH17 into PATCH16
- Added ONE_REG interface for VCPU timer in PATCH13
- Use HTIMEDELTA for VCPU timer in PATCH13
- Updated KVM RISC-V mailing list in MAINTAINERS entry
- Update KVM kconfig option to depend on RISCV_SBI and MMU
- Check for SBI v0.2 and SBI v0.2 RFENCE extension at boot-time
- Use SBI v0.2 RFENCE extension in VMID implementation
- Use SBI v0.2 RFENCE extension in Stage2 MMU implementation
- Use SBI v0.2 RFENCE extension in SBI implementation
- Moved to RISC-V Hypervisor v0.5 draft spec
- Updated Documentation/virt/kvm/api.txt for timer ONE_REG interface
- Rebased patches on Linux-5.5-rc3

Changes since v8:
- Rebased series on Linux-5.4-rc3 and Atish's SBI v0.2 patches
- Use HRTIMER_MODE_REL instead of HRTIMER_MODE_ABS in timer emulation
- Fixed kvm_riscv_stage2_map() to handle hugepages
- Added patch to forward unhandled SBI calls to user-space
- Added patch for iterative/recursive stage2 page table programming
- Added patch to remove per-CPU vsip_shadow variable
- Added patch to fix race-condition in kvm_riscv_vcpu_sync_interrupts()

Changes since v7:
- Rebased series on Linux-5.4-rc1 and Atish's SBI v0.2 patches
- Removed PATCH1, PATCH3, and PATCH20 because these already merged
- Use kernel doc style comments for ISA bitmap functions
- Don't parse X, Y, and Z extension in riscv_fill_hwcap() because it will
be added in-future
- Mark KVM RISC-V kconfig option as EXPERIMENTAL
- Typo fix in commit description of PATCH6 of v7 series
- Use separate structs for CORE and CSR registers of ONE_REG interface
- Explicitly include asm/sbi.h in kvm/vcpu_sbi.c
- Removed implicit switch-case fall-through in kvm_riscv_vcpu_exit()
- No need to set VSSTATUS.MXR bit in kvm_riscv_vcpu_unpriv_read()
- Removed register for instruction length in kvm_riscv_vcpu_unpriv_read()
- Added defines for checking/decoding instruction length
- Added separate patch to forward unhandled SBI calls to userspace tool

Changes since v6:
- Rebased patches on Linux-5.3-rc7
- Added "return_handled" in struct kvm_mmio_decode to ensure that
kvm_riscv_vcpu_mmio_return() updates SEPC only once
- Removed trap_stval parameter from kvm_riscv_vcpu_unpriv_read()
- Updated git repo URL in MAINTAINERS entry

Changes since v5:
- Update SPEC in kvm_riscv_vcpu_mmio_return() for MMIO exits
- Use switch case instead of illegal instruction opcode table for simplicity
- Improve comments in stage2_remote_tlb_flush() for a potential remote TLB
flush optimization
- Handle all unsupported SBI calls in default case of
kvm_riscv_vcpu_sbi_ecall() function
- Fixed kvm_riscv_vcpu_sync_interrupts() for software interrupts
- Improved unprivilege reads to handle traps due to Guest stage1 page table
- Added separate patch to document RISC-V specific things in

Changes since v4:
- Rebased patches on Linux-5.3-rc5
- Added Paolo's Acked-by and Reviewed-by
- Updated mailing list in MAINTAINERS entry

Changes since v3:
- Moved patch for ISA bitmap from KVM prep series to this series
- Make vsip_shadow as run-time percpu variable instead of compile-time
- Flush Guest TLBs on all Host CPUs whenever we run-out of VMIDs

Changes since v2:
- Removed references of KVM_REQ_IRQ_PENDING from all patches
- Use kvm->srcu within in-kernel KVM run loop
- Added percpu vsip_shadow to track last value programmed in VSIP CSR
- Added comments about irqs_pending and irqs_pending_mask
- Used kvm_arch_vcpu_runnable() in-place-of kvm_riscv_vcpu_has_interrupt()
in system_opcode_insn()
- Removed unwanted smp_wmb() in kvm_riscv_stage2_vmid_update()
- Use kvm_flush_remote_tlbs() in kvm_riscv_stage2_vmid_update()
- Use READ_ONCE() in kvm_riscv_stage2_update_hgatp() for vmid

Changes since v1:
- Fixed compile errors in building KVM RISC-V as module
- Removed unused kvm_riscv_halt_guest() and kvm_riscv_resume_guest()
- Set KVM_CAP_SYNC_MMU capability only after MMU notifiers are implemented
- Made vmid_version as unsigned long instead of atomic
- Renamed kvm_riscv_stage2_update_pgtbl() to kvm_riscv_stage2_update_hgatp()
- Configure HIDELEG and HEDELEG in kvm_arch_hardware_enable()
- Updated ONE_REG interface for CSR access to user-space
- Removed irqs_pending_lock and use atomic bitops instead
- Added separate patch for FP ONE_REG interface
- Added separate patch for updating MAINTAINERS file

Anup Patel (15):
RISC-V: Export riscv_cpuid_to_hartid_mask() API
RISC-V: Add bitmap reprensenting ISA features common across CPUs
RISC-V: Add hypervisor extension related CSR defines
RISC-V: Add initial skeletal KVM support
RISC-V: KVM: Implement VCPU create, init and destroy functions
RISC-V: KVM: Implement VCPU interrupts and requests handling
RISC-V: KVM: Implement VCPU world-switch
RISC-V: KVM: Handle MMIO exits for VCPU
RISC-V: KVM: Handle WFI exits for VCPU
RISC-V: KVM: Implement VMID allocator
RISC-V: KVM: Implement stage2 page table programming
RISC-V: KVM: Implement MMU notifiers
RISC-V: KVM: Document RISC-V specific parts of KVM API.

Atish Patra (4):
RISC-V: KVM: Add timer functionality
RISC-V: KVM: FP lazy save/restore
RISC-V: KVM: Implement ONE REG interface for FP registers
RISC-V: KVM: Add SBI v0.1 support

Documentation/virt/kvm/api.txt | 169 +++-
arch/riscv/Kconfig | 2 +
arch/riscv/Makefile | 2 +
arch/riscv/include/asm/csr.h | 78 +-
arch/riscv/include/asm/hwcap.h | 22 +
arch/riscv/include/asm/kvm_host.h | 264 ++++++
arch/riscv/include/asm/kvm_vcpu_timer.h | 44 +
arch/riscv/include/asm/pgtable-bits.h | 1 +
arch/riscv/include/uapi/asm/kvm.h | 127 +++
arch/riscv/kernel/asm-offsets.c | 148 ++++
arch/riscv/kernel/cpufeature.c | 83 +-
arch/riscv/kernel/smp.c | 2 +
arch/riscv/kvm/Kconfig | 34 +
arch/riscv/kvm/Makefile | 14 +
arch/riscv/kvm/main.c | 97 +++
arch/riscv/kvm/mmu.c | 762 +++++++++++++++++
arch/riscv/kvm/tlb.S | 43 +
arch/riscv/kvm/vcpu.c | 1013 +++++++++++++++++++++++
arch/riscv/kvm/vcpu_exit.c | 639 ++++++++++++++
arch/riscv/kvm/vcpu_sbi.c | 171 ++++
arch/riscv/kvm/vcpu_switch.S | 382 +++++++++
arch/riscv/kvm/vcpu_timer.c | 225 +++++
arch/riscv/kvm/vm.c | 86 ++
arch/riscv/kvm/vmid.c | 120 +++
drivers/clocksource/timer-riscv.c | 8 +
include/clocksource/timer-riscv.h | 16 +
include/uapi/linux/kvm.h | 8 +
28 files changed, 4558 insertions(+), 13 deletions(-)
create mode 100644 arch/riscv/include/asm/kvm_host.h
create mode 100644 arch/riscv/include/asm/kvm_vcpu_timer.h
create mode 100644 arch/riscv/include/uapi/asm/kvm.h
create mode 100644 arch/riscv/kvm/Kconfig
create mode 100644 arch/riscv/kvm/Makefile
create mode 100644 arch/riscv/kvm/main.c
create mode 100644 arch/riscv/kvm/mmu.c
create mode 100644 arch/riscv/kvm/tlb.S
create mode 100644 arch/riscv/kvm/vcpu.c
create mode 100644 arch/riscv/kvm/vcpu_exit.c
create mode 100644 arch/riscv/kvm/vcpu_sbi.c
create mode 100644 arch/riscv/kvm/vcpu_switch.S
create mode 100644 arch/riscv/kvm/vcpu_timer.c
create mode 100644 arch/riscv/kvm/vm.c
create mode 100644 arch/riscv/kvm/vmid.c
create mode 100644 include/clocksource/timer-riscv.h


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