Re: [PATCH v20 00/17] KVM RISC-V Support

From: Anup Patel
Date: Fri Oct 01 2021 - 06:41:32 EST

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On Fri, Oct 1, 2021 at 2:33 PM Ley Foon Tan <lftan.linux@xxxxxxxxx> wrote:
>
> On Mon, Sep 27, 2021 at 8:01 PM Anup Patel <anup@xxxxxxxxxxxxxx> wrote:
> >
> > Hi Palmer, Hi Paolo,
> >
> > On Mon, Sep 27, 2021 at 5:10 PM Anup Patel <anup.patel@xxxxxxx> 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
>
> Hi Anup
>
> I have tried this patchset, but have problems starting the kvm on host linux.
> Both Qemu and Spike are unable to run kvm.
>
> 1. Qemu: have the following error when starting kvm.
>
> [ 17.877101] Run /init as init process
> [ 217.908013] kvm [61]: VCPU exit error -14
> [ 217.908577] kvm [61]: SEPC=0x7e86a SSTATUS=0x4020 HSTATUS=0x200200080
> [ 217.909626] kvm [61]: SCAUSE=0x2 STVAL=0x20866633 HTVAL=0x0 HTINST=0x0
> KVM_RUN failed: Bad address
>
> 2. Spike: Stop at this line when starting kvm.
>
> [ 1.116675] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
> [ 1.120875] NET: Registered PF_PACKET protocol family
> [ 1.123830] 9pnet: Installing 9P2000 support
> [ 1.127935] Key type dns_resolver registered
> [ 1.130390] debug_vm_pgtable: [debug_vm_pgtable ]:
> Validating architecture page table helpers

It's strange everything works for me on QEMU at least. Although, I did
not have time to try on Spike.

>
> These are the git repo that I'm using:
> Linux: https://github.com/avpatel/linux/tree/riscv_kvm_v20
> Qemu: https://gitlab.com/qemu-project/qemu.git (master branch)
> Spike: https://github.com/riscv/riscv-isa-sim.git (master branch)
> kvm-tool: https//github.com/avpatel/kvmtool.git

You should be using riscv_v9 branch of
https//github.com/avpatel/kvmtool.git

>
> Any other things that need to be updated to make it work?

If you want to use exact same QEMU which I am using then
PULL riscv_aia_v2 branch of
https://github.com/avpatel/qemu.git

I have provided my QEMU log below as well.

Regards,
Anup

>
> Note, previous v19 patchset is okay.
>
> Regards
> Ley Foon

anup@anup-ubuntu64-vm:~/Work/riscv-test$ qemu-system-riscv64 -cpu
rv64,x-h=true -M virt -m 512M -nographic -bios
opensbi/build/platform/generic/firmware/fw_jump.bin -kernel
./build-riscv64/arch/riscv/boot/Image -initrd ./rootfs_kvm_riscv64.img
-append "root=/dev/ram rw console=ttyS0 earlycon=sbi" -smp 6

OpenSBI v0.9-165-g4478809
____ _____ ____ _____
/ __ \ / ____| _ \_ _|
| | | |_ __ ___ _ __ | (___ | |_) || |
| | | | '_ \ / _ \ '_ \ \___ \| _ < | |
| |__| | |_) | __/ | | |____) | |_) || |_
\____/| .__/ \___|_| |_|_____/|____/_____|
| |
|_|

Platform Name : riscv-virtio,qemu
Platform Features : medeleg
Platform HART Count : 6
Platform IPI Device : aclint-mswi
Platform Timer Device : aclint-mtimer @ 10000000Hz
Platform Console Device : uart8250
Platform HSM Device : ---
Platform SysReset Device : sifive_test
Firmware Base : 0x80000000
Firmware Size : 304 KB
Runtime SBI Version : 0.3

Domain0 Name : root
Domain0 Boot HART : 2
Domain0 HARTs : 0*,1*,2*,3*,4*,5*
Domain0 Region00 : 0x0000000002000000-0x000000000200ffff (I)
Domain0 Region01 : 0x0000000080000000-0x000000008007ffff ()
Domain0 Region02 : 0x0000000000000000-0xffffffffffffffff (R,W,X)
Domain0 Next Address : 0x0000000080200000
Domain0 Next Arg1 : 0x0000000082200000
Domain0 Next Mode : S-mode
Domain0 SysReset : yes

Boot HART ID : 2
Boot HART Domain : root
Boot HART ISA : rv64imafdcsuh
Boot HART Features : scounteren,mcounteren,time
Boot HART PMP Count : 16
Boot HART PMP Granularity : 4
Boot HART PMP Address Bits: 54
Boot HART MHPM Count : 0
Boot HART MIDELEG : 0x0000000000001666
Boot HART MEDELEG : 0x0000000000f0b509
[ 0.000000] Linux version 5.15.0-rc3-00020-g3940bf8c7e02
(anup@anup-ubuntu64-vm) (riscv64-unknown-linux-gnu-gcc (GCC) 9.2.0,
GNU ld (GNU Binutils) 2.34) #3 SMP Mon Sep 27 11:55:05 IST 2021
[ 0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80200000
[ 0.000000] Machine model: riscv-virtio,qemu
[ 0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
[ 0.000000] printk: bootconsole [sbi0] enabled
[ 0.000000] efi: UEFI not found.
[ 0.000000] Zone ranges:
[ 0.000000] DMA32 [mem 0x0000000080200000-0x000000009fffffff]
[ 0.000000] Normal empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000080200000-0x000000009fffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000080200000-0x000000009fffffff]
[ 0.000000] SBI specification v0.3 detected
[ 0.000000] SBI implementation ID=0x1 Version=0x9
[ 0.000000] SBI TIME extension detected
[ 0.000000] SBI IPI extension detected
[ 0.000000] SBI RFENCE extension detected
[ 0.000000] SBI SRST extension detected
[ 0.000000] SBI v0.2 HSM extension detected
[ 0.000000] riscv: ISA extensions acdfhimsu
[ 0.000000] riscv: ELF capabilities acdfim
[ 0.000000] percpu: Embedded 17 pages/cpu s31080 r8192 d30360 u69632
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 128775
[ 0.000000] Kernel command line: root=/dev/ram rw console=ttyS0 earlycon=sbi
[ 0.000000] Dentry cache hash table entries: 65536 (order: 7,
524288 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 32768 (order: 6, 262144
bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] fixmap : 0xffffffcefee00000 - 0xffffffceff000000
(2048 kB)
[ 0.000000] pci io : 0xffffffceff000000 - 0xffffffcf00000000
( 16 MB)
[ 0.000000] vmemmap : 0xffffffcf00000000 - 0xffffffcfffffffff
(4095 MB)
[ 0.000000] vmalloc : 0xffffffd000000000 - 0xffffffdfffffffff
(65535 MB)
[ 0.000000] lowmem : 0xffffffe000000000 - 0xffffffe01fe00000
( 510 MB)
[ 0.000000] kernel : 0xffffffff80000000 - 0xffffffffffffffff
(2047 MB)
[ 0.000000] Memory: 461472K/522240K available (7348K kernel code,
4928K rwdata, 4096K rodata, 2147K init, 299K bss, 60768K reserved, 0K
cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=6, Nodes=1
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=6.
[ 0.000000] rcu: RCU debug extended QS entry/exit.
[ 0.000000] Tracing variant of Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay
is 25 jiffies.
[ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=6
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] riscv-intc: 64 local interrupts mapped
[ 0.000000] plic: plic@c000000: mapped 53 interrupts with 6
handlers for 12 contexts.
[ 0.000000] random: get_random_bytes called from
start_kernel+0x4be/0x6d0 with crng_init=0
[ 0.000000] riscv_timer_init_dt: Registering clocksource cpuid [0] hartid [2]
[ 0.000000] clocksource: riscv_clocksource: mask:
0xffffffffffffffff max_cycles: 0x24e6a1710, max_idle_ns: 440795202120
ns
[ 0.000098] sched_clock: 64 bits at 10MHz, resolution 100ns, wraps
every 4398046511100ns
[ 0.007687] Console: colour dummy device 80x25
[ 0.022506] Calibrating delay loop (skipped), value calculated
using timer frequency.. 20.00 BogoMIPS (lpj=40000)
[ 0.024665] pid_max: default: 32768 minimum: 301
[ 0.028336] Mount-cache hash table entries: 1024 (order: 1, 8192
bytes, linear)
[ 0.037197] Mountpoint-cache hash table entries: 1024 (order: 1,
8192 bytes, linear)
[ 0.099528] ASID allocator disabled
[ 0.102334] rcu: Hierarchical SRCU implementation.
[ 0.105587] EFI services will not be available.
[ 0.111331] smp: Bringing up secondary CPUs ...
[ 0.142352] smp: Brought up 1 node, 6 CPUs
[ 0.169452] devtmpfs: initialized
[ 0.188459] clocksource: jiffies: mask: 0xffffffff max_cycles:
0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.191145] futex hash table entries: 2048 (order: 5, 131072 bytes, linear)
[ 0.203626] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[ 0.274557] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
[ 0.287213] vgaarb: loaded
[ 0.289575] SCSI subsystem initialized
[ 0.296764] usbcore: registered new interface driver usbfs
[ 0.297502] usbcore: registered new interface driver hub
[ 0.299242] usbcore: registered new device driver usb
[ 0.331551] clocksource: Switched to clocksource riscv_clocksource
[ 0.392658] NET: Registered PF_INET protocol family
[ 0.394693] IP idents hash table entries: 8192 (order: 4, 65536
bytes, linear)
[ 0.400489] tcp_listen_portaddr_hash hash table entries: 256
(order: 1, 10240 bytes, linear)
[ 0.401236] TCP established hash table entries: 4096 (order: 3,
32768 bytes, linear)
[ 0.402002] TCP bind hash table entries: 4096 (order: 5, 131072
bytes, linear)
[ 0.402824] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.405079] UDP hash table entries: 256 (order: 2, 24576 bytes, linear)
[ 0.406084] UDP-Lite hash table entries: 256 (order: 2, 24576 bytes, linear)
[ 0.409396] NET: Registered PF_UNIX/PF_LOCAL protocol family
[ 0.417946] RPC: Registered named UNIX socket transport module.
[ 0.418574] RPC: Registered udp transport module.
[ 0.418907] RPC: Registered tcp transport module.
[ 0.419565] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.420333] PCI: CLS 0 bytes, default 64
[ 0.421657] kvm [1]: hypervisor extension available
[ 0.422370] kvm [1]: using Sv48x4 G-stage page table format
[ 0.422849] kvm [1]: VMID 14 bits available
[ 0.430261] workingset: timestamp_bits=62 max_order=17 bucket_order=0
[ 0.433208] Unpacking initramfs...
[ 0.453698] NFS: Registering the id_resolver key type
[ 0.455536] Key type id_resolver registered
[ 0.455945] Key type id_legacy registered
[ 0.456826] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 0.457448] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver
Registering...
[ 0.460062] 9p: Installing v9fs 9p2000 file system support
[ 0.464474] NET: Registered PF_ALG protocol family
[ 0.472960] Block layer SCSI generic (bsg) driver version 0.4
loaded (major 251)
[ 0.473738] io scheduler mq-deadline registered
[ 0.474674] io scheduler kyber registered
[ 0.500235] pci-host-generic 30000000.pci: host bridge
/soc/pci@30000000 ranges:
[ 0.501816] pci-host-generic 30000000.pci: IO
0x0003000000..0x000300ffff -> 0x0000000000
[ 0.504308] pci-host-generic 30000000.pci: MEM
0x0040000000..0x007fffffff -> 0x0040000000
[ 0.504957] pci-host-generic 30000000.pci: MEM
0x0400000000..0x07ffffffff -> 0x0400000000
[ 0.506348] pci-host-generic 30000000.pci: Memory resource size
exceeds max for 32 bits
[ 0.510652] pci-host-generic 30000000.pci: ECAM at [mem
0x30000000-0x3fffffff] for [bus 00-ff]
[ 0.517617] pci-host-generic 30000000.pci: PCI host bridge to bus 0000:00
[ 0.519442] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 0.520018] pci_bus 0000:00: root bus resource [io 0x0000-0xffff]
[ 0.520772] pci_bus 0000:00: root bus resource [mem 0x40000000-0x7fffffff]
[ 0.521355] pci_bus 0000:00: root bus resource [mem 0x400000000-0x7ffffffff]
[ 0.524395] pci 0000:00:00.0: [1b36:0008] type 00 class 0x060000
[ 0.679883] Freeing initrd memory: 31888K
[ 0.815789] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[ 0.825590] printk: console [ttyS0] disabled
[ 0.829565] 10000000.uart: ttyS0 at MMIO 0x10000000 (irq = 2,
base_baud = 230400) is a 16550A
[ 0.833171] printk: console [ttyS0] enabled
[ 0.833171] printk: console [ttyS0] enabled
[ 0.834330] printk: bootconsole [sbi0] disabled
[ 0.834330] printk: bootconsole [sbi0] disabled
[ 0.838103] [drm] radeon kernel modesetting enabled.
[ 0.866158] loop: module loaded
[ 0.872649] libphy: Fixed MDIO Bus: probed
[ 0.874646] tun: Universal TUN/TAP device driver, 1.6
[ 0.877187] e1000e: Intel(R) PRO/1000 Network Driver
[ 0.877444] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 0.878396] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 0.878808] ehci-pci: EHCI PCI platform driver
[ 0.879603] ehci-platform: EHCI generic platform driver
[ 0.880429] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 0.880848] ohci-pci: OHCI PCI platform driver
[ 0.881460] ohci-platform: OHCI generic platform driver
[ 0.883955] usbcore: registered new interface driver uas
[ 0.884628] usbcore: registered new interface driver usb-storage
[ 0.886314] mousedev: PS/2 mouse device common for all mice
[ 0.890923] goldfish_rtc 101000.rtc: registered as rtc0
[ 0.892046] goldfish_rtc 101000.rtc: setting system clock to
2021-10-01T10:33:38 UTC (1633084418)
[ 0.899464] syscon-poweroff soc:poweroff: pm_power_off already
claimed for sbi_srst_power_off
[ 0.900071] syscon-poweroff: probe of soc:poweroff failed with error -16
[ 0.901020] sdhci: Secure Digital Host Controller Interface driver
[ 0.901287] sdhci: Copyright(c) Pierre Ossman
[ 0.901751] sdhci-pltfm: SDHCI platform and OF driver helper
[ 0.904482] usbcore: registered new interface driver usbhid
[ 0.904790] usbhid: USB HID core driver
[ 0.908639] NET: Registered PF_INET6 protocol family
[ 0.927664] Segment Routing with IPv6
[ 0.928044] In-situ OAM (IOAM) with IPv6
[ 0.928708] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[ 0.932629] NET: Registered PF_PACKET protocol family
[ 0.934783] 9pnet: Installing 9P2000 support
[ 0.935834] Key type dns_resolver registered
[ 0.939287] debug_vm_pgtable: [debug_vm_pgtable ]:
Validating architecture page table helpers
[ 0.997012] Freeing unused kernel image (initmem) memory: 2144K
[ 1.009790] Run /init as init process
_ _
| ||_|
| | _ ____ _ _ _ _
| || | _ \| | | |\ \/ /
| || | | | | |_| |/ \
|_||_|_| |_|\____|\_/\_/

Busybox Rootfs

Please press Enter to activate this console.
/ #
/ #
/ #
/ #
/ # ./apps/lkvm-static run -m 256 -c2 --console serial -p "console=ttyS0 earlyco
n=sbi" -k ./apps/Image --debug
# lkvm run -k ./apps/Image -m 256 -c 2 --name guest-73
Info: (riscv/kvm.c) kvm__arch_load_kernel_image:115: Loaded kernel
to 0x80200000 (19828224 bytes)
Info: (riscv/kvm.c) kvm__arch_load_kernel_image:126: Placing fdt at
0x81c00000 - 0x8fffffff
Info: (virtio/mmio.c) virtio_mmio_init:325:
virtio-mmio.devices=0x200@0x10000000:5
Info: (virtio/mmio.c) virtio_mmio_init:325:
virtio-mmio.devices=0x200@0x10000200:6
Info: (virtio/mmio.c) virtio_mmio_init:325:
virtio-mmio.devices=0x200@0x10000400:7
[ 0.000000] Linux version 5.15.0-rc3-00020-g3940bf8c7e02
(anup@anup-ubuntu64-vm) (riscv64[ 18.277856] random: fast init done
-unknown-linux-gnu-gcc (GCC) 9.2.0, GNU ld (GNU Binutils) 2.34) #3 SMP
Mon Sep 27 11:55:05 IST 2021
[ 0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80200000
[ 0.000000] Machine model: linux,dummy-virt
[ 0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
[ 0.000000] printk: bootconsole [sbi0] enabled
[ 0.000000] efi: UEFI not found.
[ 0.000000] Zone ranges:
[ 0.000000] DMA32 [mem 0x0000000080200000-0x000000008fffffff]
[ 0.000000] Normal empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000080200000-0x000000008fffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000080200000-0x000000008fffffff]
[ 0.000000] SBI specification v0.1 detected
[ 0.000000] riscv: ISA extensions acdfimsu
[ 0.000000] riscv: ELF capabilities acdfim
[ 0.000000] percpu: Embedded 17 pages/cpu s31080 r8192 d30360 u69632
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 64135
[ 0.000000] Kernel command line: console=ttyS0 rw
rootflags=trans=virtio,version=9p2000.L,cache=loose rootfstype=9p
init=/virt/init ip=dhcp console=ttyS0 earlycon=sbi
[ 0.000000] Dentry cache hash table entries: 32768 (order: 6,
262144 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 16384 (order: 5, 131072
bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] fixmap : 0xffffffcefee00000 - 0xffffffceff000000
(2048 kB)
[ 0.000000] pci io : 0xffffffceff000000 - 0xffffffcf00000000
( 16 MB)
[ 0.000000] vmemmap : 0xffffffcf00000000 - 0xffffffcfffffffff
(4095 MB)
[ 0.000000] vmalloc : 0xffffffd000000000 - 0xffffffdfffffffff
(65535 MB)
[ 0.000000] lowmem : 0xffffffe000000000 - 0xffffffe00fe00000
( 254 MB)
[ 0.000000] kernel : 0xffffffff80000000 - 0xffffffffffffffff
(2047 MB)
[ 0.000000] Memory: 235480K/260096K available (7348K kernel code,
4928K rwdata, 4096K rodata, 2147K init, 299K bss, 24616K reserved, 0K
cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.
[ 0.000000] rcu: RCU debug extended QS entry/exit.
[ 0.000000] Tracing variant of Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay
is 25 jiffies.
[ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] riscv-intc: 64 local interrupts mapped
[ 0.000000] plic: interrupt-controller@0c000000: mapped 1023
interrupts with 2 handlers for 4 contexts.
[ 0.000000] random: get_random_bytes called from
start_kernel+0x4be/0x6d0 with crng_init=0
[ 0.000000] riscv_timer_init_dt: Registering clocksource cpuid [0] hartid [0]
[ 0.000000] clocksource: riscv_clocksource: mask:
0xffffffffffffffff max_cycles: 0x24e6a1710, max_idle_ns: 440795202120
ns
[ 0.000105] sched_clock: 64 bits at 10MHz, resolution 100ns, wraps
every 4398046511100ns
[ 0.047895] Console: colour dummy device 80x25
[ 0.070813] Calibrating delay loop (skipped), value calculated
using timer frequency.. 20.00 BogoMIPS (lpj=40000)
[ 0.097962] pid_max: default: 32768 minimum: 301
[ 0.120511] Mount-cache hash table entries: 512 (order: 0, 4096
bytes, linear)
[ 0.139480] Mountpoint-cache hash table entries: 512 (order: 0,
4096 bytes, linear)
[ 0.317809] ASID allocator disabled
[ 0.327541] rcu: Hierarchical SRCU implementation.
[ 0.356508] EFI services will not be available.
[ 0.403586] smp: Bringing up secondary CPUs ...
[ 0.458170] smp: Brought up 1 node, 2 CPUs
[ 0.529462] devtmpfs: initialized
[ 0.603517] clocksource: jiffies: mask: 0xffffffff max_cycles:
0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.627416] futex hash table entries: 512 (order: 3, 32768 bytes, linear)
[ 0.691307] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[ 0.857061] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
[ 0.903144] vgaarb: loaded
[ 0.930196] SCSI subsystem initialized
[ 0.971577] usbcore: registered new interface driver usbfs
[ 0.992211] usbcore: registered new interface driver hub
[ 1.014991] usbcore: registered new device driver usb
[ 1.089570] clocksource: Switched to clocksource riscv_clocksource
[ 1.312442] NET: Registered PF_INET protocol family
[ 1.332297] IP idents hash table entries: 4096 (order: 3, 32768
bytes, linear)
[ 1.368581] tcp_listen_portaddr_hash hash table entries: 128
(order: 0, 5120 bytes, linear)
[ 1.389779] TCP established hash table entries: 2048 (order: 2,
16384 bytes, linear)
[ 1.415814] TCP bind hash table entries: 2048 (order: 4, 65536 bytes, linear)
[ 1.451789] TCP: Hash tables configured (established 2048 bind 2048)
[ 1.492552] UDP hash table entries: 256 (order: 2, 24576 bytes, linear)
[ 1.516653] UDP-Lite hash table entries: 256 (order: 2, 24576 bytes, linear)
[ 1.551271] NET: Registered PF_UNIX/PF_LOCAL protocol family
[ 1.644965] RPC: Registered named UNIX socket transport module.
[ 1.662890] RPC: Registered udp transport module.
[ 1.672738] RPC: Registered tcp transport module.
[ 1.684608] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 1.699605] PCI: CLS 0 bytes, default 64
[ 1.712981] kvm [1]: hypervisor extension not available
[ 1.751290] workingset: timestamp_bits=62 max_order=16 bucket_order=0
[ 1.900334] NFS: Registering the id_resolver key type
[ 1.911896] Key type id_resolver registered
[ 1.920084] Key type id_legacy registered
[ 1.936737] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 1.958536] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver
Registering...
[ 1.984251] 9p: Installing v9fs 9p2000 file system support
[ 2.018560] NET: Registered PF_ALG protocol family
[ 2.031591] Block layer SCSI generic (bsg) driver version 0.4
loaded (major 251)
[ 2.054728] io scheduler mq-deadline registered
[ 2.066140] io scheduler kyber registered
[ 2.123648] pci-host-generic 30000000.pci: host bridge /smb/pci ranges:
[ 2.140214] pci-host-generic 30000000.pci: IO
0x0000000000..0x000000ffff -> 0x0000000000
[ 2.159639] pci-host-generic 30000000.pci: MEM
0x0040000000..0x007fffffff -> 0x0040000000
[ 2.186223] pci-host-generic 30000000.pci: ECAM at [mem
0x30000000-0x3fffffff] for [bus 00-01]
[ 2.212533] pci-host-generic 30000000.pci: PCI host bridge to bus 0000:00
[ 2.230607] pci_bus 0000:00: root bus resource [bus 00-01]
[ 2.244304] pci_bus 0000:00: root bus resource [io 0x0000-0xffff]
[ 2.261587] pci_bus 0000:00: root bus resource [mem 0x40000000-0x7fffffff]
[ 3.247473] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[ 3.287475] printk: console [ttyS0] disabled
[ 3.301067] 3f8.U6_16550A: ttyS0 at MMIO 0x3f8 (irq = 4, base_baud
= 115200) is a 16550A
[ 3.339067] printk: console [ttyS0] enabled
[ 3.339067] printk: console [ttyS0] enabled
[ 3.379379] printk: bootconsole [sbi0] disabled
[ 3.379379] printk: bootconsole [sbi0] disabled
[ 3.424926] 2f8.U6_16550A: ttyS1 at MMIO 0x2f8 (irq = 6, base_baud
= 115200) is a 16550A
[ 3.474126] 3e8.U6_16550A: ttyS2 at MMIO 0x3e8 (irq = 7, base_baud
= 115200) is a 16550A
[ 3.518645] 2e8.U6_16550A: ttyS3 at MMIO 0x2e8 (irq = 8, base_baud
= 115200) is a 16550A
[ 3.569005] [drm] radeon kernel modesetting enabled.
[ 3.764244] loop: module loaded
[ 3.823261] libphy: Fixed MDIO Bus: probed
[ 3.874746] tun: Universal TUN/TAP device driver, 1.6
[ 3.955899] net eth0: Fail to set guest offload.
[ 3.974623] virtio_net virtio2 eth0: set_features() failed (-22);
wanted 0x0000000000134829, left 0x0080000000134829
[ 4.039551] e1000e: Intel(R) PRO/1000 Network Driver
[ 4.066605] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 4.094301] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 4.121598] ehci-pci: EHCI PCI platform driver
[ 4.139321] ehci-platform: EHCI generic platform driver
[ 4.163482] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 4.190231] ohci-pci: OHCI PCI platform driver
[ 4.211914] ohci-platform: OHCI generic platform driver
[ 4.262796] usbcore: registered new interface driver uas
[ 4.291123] usbcore: registered new interface driver usb-storage
[ 4.315228] mousedev: PS/2 mouse device common for all mice
[ 4.344139] sdhci: Secure Digital Host Controller Interface driver
[ 4.377006] sdhci: Copyright(c) Pierre Ossman
[ 4.400437] sdhci-pltfm: SDHCI platform and OF driver helper
[ 4.438821] usbcore: registered new interface driver usbhid
[ 4.464857] usbhid: USB HID core driver
[ 4.513075] NET: Registered PF_INET6 protocol family
[ 4.607772] Segment Routing with IPv6
[ 4.620961] In-situ OAM (IOAM) with IPv6
[ 4.647281] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[ 4.689995] NET: Registered PF_PACKET protocol family
[ 4.722695] 9pnet: Installing 9P2000 support
[ 4.763733] Key type dns_resolver registered
[ 4.795638] debug_vm_pgtable: [debug_vm_pgtable ]:
Validating architecture page table helpers
[ 4.926827] Sending DHCP requests ., OK
[ 4.966566] IP-Config: Got DHCP answer from 192.168.33.1, my
address is 192.168.33.15
[ 4.994534] IP-Config: Complete:
[ 5.006236] device=eth0, hwaddr=02:15:15:15:15:15,
ipaddr=192.168.33.15, mask=255.255.255.0, gw=192.168.33.1
[ 5.042790] host=192.168.33.15, domain=, nis-domain=(none)
[ 5.065080] bootserver=192.168.33.1, rootserver=0.0.0.0, rootpath=
[ 5.065399] nameserver0=192.168.33.1
[ 5.183771] VFS: Mounted root (9p filesystem) on device 0:15.
[ 5.223392] devtmpfs: mounted
[ 5.470393] Freeing unused kernel image (initmem) memory: 2144K
[ 5.503256] Run /virt/init as init process
Mounting...
/ #
/ # [ 6.766025] random: fast init done
/ # cat /proc/interrupts
CPU0 CPU1
1: 129 0 SiFive PLIC 5 Edge virtio0
2: 175 0 SiFive PLIC 6 Edge virtio1
3: 11 0 SiFive PLIC 7 Edge virtio2
4: 57 0 SiFive PLIC 1 Edge ttyS0
5: 765 884 RISC-V INTC 5 Edge riscv-timer
IPI0: 3 19 Rescheduling interrupts
IPI1: 792 845 Function call interrupts
IPI2: 0 0 CPU stop interrupts
IPI3: 0 0 IRQ work interrupts
IPI4: 0 0 Timer broadcast interrupts
/ #

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