[PATCH RFC 0/9] Add riscv64 kvm accel support

[Yifei Jiang]

Hi,

This series adds riscv64 kvm support, It is based on riscv_kvm_master
branch at https://github.com/kvm-riscv/linux.

This series depends on above pending changes which haven't yet been
accepted, so this QEMU patch series is blocked until that dependency
has been dealt with, but is worth reviewing anyway.

Several steps to use this:

1. Build riscv64 emulation
$ ./configure --target-list=riscv64-softmmu
$ make -j$(nproc)

2. Build kernel
riscv_kvm_master branch at https://github.com/kvm-riscv/linux

3. Build QEMU VM
I cross build in riscv toolchain
$ PKG_CONFIG_LIBDIR=<toolchain pkgconfig path>
$ export PKG_CONFIG_SYSROOT_DIR=<toolchain sysroot path>
$ ./configure --target-list=riscv64-softmmu --enable-kvm \
--cross-prefix=riscv64-linux-gnu- --disable-libiscsi --disable-glusterfs \
--disable-libusb --disable-usb-redir --audio-drv-list= --disable-opengl \
--disable-libxml2

4. Start riscv64 emulation
$ ./qemu-system-riscv64 -M virt -m 4096M -cpu rv64,x-h=true -nographic \
        -name guest=riscv-hyp,debug-threads=on \
        -smp 4 \
        -kernel ./fw_jump.elf \
        -device loader,file=./Image,addr=0x80200000 \
        -drive file=./hyp.img,format=raw,id=hd0 \
        -device virtio-blk-device,drive=hd0 \
        -append "root=/dev/vda rw console=ttyS0 earlycon=sbi"

5. Start kvm-acceled QEMU VM in riscv64 emulation
$ ./qemu-system-riscv64 -M virt,accel=kvm -m 1024M -cpu host -nographic \
        -name guest=riscv-guset \
         -smp 2 \
        -kernel ./Image \
        -drive file=./guest.img,format=raw,id=hd0 \
        -device virtio-blk-device,drive=hd0 \
        -append "root=/dev/vda rw console=ttyS0 earlycon=sbi"

Yifei Jiang (9):
  linux-header: Update linux/kvm.h
  target/riscv: Add target/riscv/kvm.c to place the public kvm interface
  target/riscv: Implement function kvm_arch_init_vcpu
  target/riscv: Implement kvm_arch_get_registers
  target/riscv: Implement kvm_arch_put_registers
  target/riscv: Support start kernel directly by KVM
  hw/riscv: PLIC update external interrupt by KVM when kvm enabled
  target/riscv: Handler KVM_EXIT_RISCV_SBI exit
  target/riscv: add host riscv64 cpu type

 configure                  |   1 +
 hw/riscv/sifive_plic.c     |  31 ++-
 hw/riscv/virt.c            |  15 +-
 linux-headers/linux/kvm.h  |   8 +
 target/riscv/Makefile.objs |   1 +
 target/riscv/cpu.c         |   9 +
 target/riscv/cpu.h         |   4 +
 target/riscv/kvm.c         | 513 +++++++++++++++++++++++++++++++++++++
 target/riscv/kvm_riscv.h   |  25 ++
 9 files changed, 596 insertions(+), 11 deletions(-)
 create mode 100644 target/riscv/kvm.c
 create mode 100644 target/riscv/kvm_riscv.h

-- 
2.19.1