[PATCH v20 00/17] KVM RISC-V Support
Anup Patel
anup at brainfault.org
Mon Sep 27 04:58:41 PDT 2021
Hi Palmer, Hi Paolo,
On Mon, Sep 27, 2021 at 5:10 PM Anup Patel <anup.patel at wdc.com> wrote:
>
> This series adds initial KVM RISC-V support. Currently, we are able to boot
> Linux on RV64/RV32 Guest with multiple VCPUs.
>
> Key aspects of KVM RISC-V added by this series are:
> 1. No RISC-V specific KVM IOCTL
> 2. Loadable KVM RISC-V module supported
> 3. Minimal possible KVM world-switch which touches only GPRs and few CSRs
> 4. Both RV64 and RV32 host supported
> 5. Full Guest/VM switch is done via vcpu_get/vcpu_put infrastructure
> 6. KVM ONE_REG interface for VCPU register access from user-space
> 7. PLIC emulation is done in user-space
> 8. Timer and IPI emuation is done in-kernel
> 9. Both Sv39x4 and Sv48x4 supported for RV64 host
> 10. MMU notifiers supported
> 11. Generic dirtylog supported
> 12. FP lazy save/restore supported
> 13. SBI v0.1 emulation for KVM Guest available
> 14. Forward unhandled SBI calls to KVM userspace
> 15. Hugepage support for Guest/VM
> 16. IOEVENTFD support for Vhost
>
> Here's a brief TODO list which we will work upon after this series:
> 1. KVM unit test support
> 2. KVM selftest support
> 3. SBI v0.3 emulation in-kernel
> 4. In-kernel PMU virtualization
> 5. In-kernel AIA irqchip support
> 6. Nested virtualizaiton
> 7. ..... and more .....
>
> This series can be found in riscv_kvm_v20 branch at:
> https//github.com/avpatel/linux.git
>
> Our work-in-progress KVMTOOL RISC-V port can be found in riscv_v9 branch
> at: https//github.com/avpatel/kvmtool.git
>
> The QEMU RISC-V hypervisor emulation is done by Alistair and is available
> in master branch at: https://git.qemu.org/git/qemu.git
>
> To play around with KVM RISC-V, refer KVM RISC-V wiki at:
> https://github.com/kvm-riscv/howto/wiki
> https://github.com/kvm-riscv/howto/wiki/KVM-RISCV64-on-QEMU
> https://github.com/kvm-riscv/howto/wiki/KVM-RISCV64-on-Spike
>
> Changes since v19:
> - Rebased on Linux-5.15-rc3
> - Converted kvm_err() to kvm_debug() in kvm_set_spte_gfn() function
> added by PATCH11
>
> Changes since v18:
> - Rebased on Linux-5.14-rc3
> - Moved to new KVM debugfs interface
> - Dropped PATCH17 of v18 series for having KVM RISC-V in drivers/staging
>
> Changes since v17:
> - Rebased on Linux-5.13-rc2
> - Moved to new KVM MMU notifier APIs
> - Removed redundant kvm_arch_vcpu_uninit()
> - Moved KVM RISC-V sources to drivers/staging for compliance with
> Linux RISC-V patch acceptance policy
>
> Changes since v16:
> - Rebased on Linux-5.12-rc5
> - Remove redundant kvm_arch_create_memslot(), kvm_arch_vcpu_setup(),
> kvm_arch_vcpu_init(), kvm_arch_has_vcpu_debugfs(), and
> kvm_arch_create_vcpu_debugfs() from PATCH5
> - Make stage2_wp_memory_region() and stage2_ioremap() as static
> in PATCH13
>
> Changes since v15:
> - Rebased on Linux-5.11-rc3
> - Fixed kvm_stage2_map() to use gfn_to_pfn_prot() for determing
> writeability of a host pfn.
> - Use "__u64" in-place of "u64" and "__u32" in-place of "u32" for
> uapi/asm/kvm.h
>
> Changes since v14:
> - Rebased on Linux-5.10-rc3
> - Fixed Stage2 (G-stage) PDG allocation to ensure it is 16KB aligned
>
> Changes since v13:
> - Rebased on Linux-5.9-rc3
> - Fixed kvm_riscv_vcpu_set_reg_csr() for SIP updation in PATCH5
> - Fixed instruction length computation in PATCH7
> - Added ioeventfd support in PATCH7
> - Ensure HSTATUS.SPVP is set to correct value before using HLV/HSV
> intructions in PATCH7
> - Fixed stage2_map_page() to set PTE 'A' and 'D' bits correctly
> in PATCH10
> - Added stage2 dirty page logging in PATCH10
> - Allow KVM user-space to SET/GET SCOUNTER CSR in PATCH5
> - Save/restore SCOUNTEREN in PATCH6
> - Reduced quite a few instructions for __kvm_riscv_switch_to() by
> using CSR swap instruction in PATCH6
> - Detect and use Sv48x4 when available in PATCH10
>
> Changes since v12:
> - Rebased patches on Linux-5.8-rc4
> - By default enable all counters in HCOUNTEREN
> - RISC-V H-Extension v0.6.1 spec support
>
> Changes since v11:
> - Rebased patches on Linux-5.7-rc3
> - Fixed typo in typecast of stage2_map_size define
> - Introduced struct kvm_cpu_trap to represent trap details and
> use it as function parameter wherever applicable
> - Pass memslot to kvm_riscv_stage2_map() for supporing dirty page
> logging in future
> - RISC-V H-Extension v0.6 spec support
> - Send-out first three patches as separate series so that it can
> be taken by Palmer for Linux RISC-V
>
> Changes since v10:
> - Rebased patches on Linux-5.6-rc5
> - Reduce RISCV_ISA_EXT_MAX from 256 to 64
> - Separate PATCH for removing N-extension related defines
> - Added comments as requested by Palmer
> - Fixed HIDELEG CSR programming
>
> Changes since v9:
> - Rebased patches on Linux-5.5-rc3
> - 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
>
> 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:
> - Renamed KVM_REG_RISCV_CONFIG_TIMEBASE register to
> KVM_REG_RISCV_CONFIG_TBFREQ register in ONE_REG interface
> - 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
> Documentation/virt/kvm/api.txt
>
> 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_REQ_UPDATE_PGTBL to KVM_REQ_UPDATE_HGATP
> - 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 (13):
> 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 KVM_GET_ONE_REG/KVM_SET_ONE_REG ioctls
> 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
> RISC-V: KVM: Add MAINTAINERS entry
>
> 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.rst | 193 ++++-
> MAINTAINERS | 12 +
> arch/riscv/Kconfig | 1 +
> arch/riscv/Makefile | 1 +
> arch/riscv/include/asm/csr.h | 87 +++
> arch/riscv/include/asm/kvm_host.h | 266 +++++++
> arch/riscv/include/asm/kvm_types.h | 7 +
> arch/riscv/include/asm/kvm_vcpu_timer.h | 44 ++
> arch/riscv/include/uapi/asm/kvm.h | 128 +++
> arch/riscv/kernel/asm-offsets.c | 156 ++++
> arch/riscv/kvm/Kconfig | 36 +
> arch/riscv/kvm/Makefile | 25 +
> arch/riscv/kvm/main.c | 118 +++
> arch/riscv/kvm/mmu.c | 802 +++++++++++++++++++
> arch/riscv/kvm/tlb.S | 74 ++
> arch/riscv/kvm/vcpu.c | 997 ++++++++++++++++++++++++
> arch/riscv/kvm/vcpu_exit.c | 701 +++++++++++++++++
> arch/riscv/kvm/vcpu_sbi.c | 185 +++++
> arch/riscv/kvm/vcpu_switch.S | 400 ++++++++++
> arch/riscv/kvm/vcpu_timer.c | 225 ++++++
> arch/riscv/kvm/vm.c | 97 +++
> arch/riscv/kvm/vmid.c | 120 +++
> drivers/clocksource/timer-riscv.c | 9 +
> include/clocksource/timer-riscv.h | 16 +
> include/uapi/linux/kvm.h | 8 +
> 25 files changed, 4699 insertions(+), 9 deletions(-)
> create mode 100644 arch/riscv/include/asm/kvm_host.h
> create mode 100644 arch/riscv/include/asm/kvm_types.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
>
> --
> 2.25.1
>
The RISC-V H-extension is now frozen. Please refer to the latest
RISC-V privilege specification v1.12 which is in public review.
https://github.com/riscv/riscv-isa-manual/releases/download/riscv-privileged-20210915-public-review/riscv-privileged-20210915-public-review.pdf
Currently, the RISC-V H-extension is on it's way to being ratified.
https://wiki.riscv.org/display/TECH/ISA+Extensions+On+Deck+for+Freeze+Milestone
https://wiki.riscv.org/display/TECH/ISA+Extensions+On+Deck+-+Ready+for+Ratification+Milestone
Here's the announcement on twitter from Mark (CTO, RISC-V International)
https://twitter.com/mark_riscv/status/1441375977624375296
This means the KVM RISC-V series now satisfies the
requirements of the Linux RISC-V patch acceptance policy.
Can we consider the KVM RISC-V series for Linux-5.16 ?
Regards,
Anup
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