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[PATCH v2 00/27] Add RISC-V Hypervisor Extension v0.4

From: Alistair Francis
Subject: [PATCH v2 00/27] Add RISC-V Hypervisor Extension v0.4
Date: Fri, 25 Oct 2019 16:23:06 -0700

This patch series adds the RISC-V Hypervisor extension v0.4. This is the
latest draft spec of the Hypervisor extension.

The Hypervisor extension is disabled by default, so this series should
result in no changes to anyone using QEMU unless they enable the
extension. The extention can be enabled with the -cpu property (see

At the moment the spec does not include information about the mstatush
register. Although this information has since been merged into the
master spec. As it is only adding support for 32-bit I have added this
register to this series.

Testing of this implementation has been done by using the baremetal
Xvisor Hypervisor. We are able to run two Linux guests (that's all I
have tried) as guests in 64-bit. In 32-bit so far I can only run
baremetal guests, but I think this is a baremetal boot loader issue and
not an issue in QEMU.

The RISC-V KVM implementation was also written using these patches. The
KVM implementation is currently under review.

These patches result in a reproducable race when booting a SMP Linux
guest inside a SMP Linux KVM host. This will need to be fixed.

At the moment this spec is in a draft state and is subject to change. As
QEMU is extreamly useful in early bring up I think it makes sense for
QEMU to support non-frozen extensions.

Thanks to Anup for doing the initial port of Xvisor. The port is avaliable here:
https://github.com/avpatel/xvisor-next and will run on QEMU.

Also thanks to Atish for implementing the SBI call support in Xvisor and
for lots of help debugging.

To run this yourself:
 1. Apply this patch series to QEMU. The latest branch can be found here:
 2. Get the version of OpenSBI that supports the H extension. This can
    be found here:
 3. Build the next release of Xvisor. It is available here:
 4. Make sure you build the Xvisor tests, see here for details:
 5. Run QEMU:
     ./riscv64-softmmu/qemu-system-riscv64 -nographic \
       -machine virt -cpu rv64,x-h=true \
       -serial mon:stdio -serial null -m 4G \
       -device loader,file=vmm.bin,addr=0x80200000 \
       -kernel fw_jump.elf \
       -initrd vmm-disk-linux.img \
       -append "vmm.console=uart@10000000 vmm.bootcmd=\"vfs mount initrd /;vfs 
run /boot.xscript;vfs cat /system/banner.txt\""

   Once you get to the prompt you can start the geust by running:
     guest kick guest0
   You can then bind to the serial port using:
     vserial bind guest0/uart0
   Then you can start Linux using:

 This was all tested with the mainline 5.2/5.3 kernels.

There is very early work on a Xen port as well which is avaliable here:

 - Get 32-bit fully working

This series is based on Palmers for-master branch:

 - Rebase on for-master
 - Consolidate patches requested by Palmer
 - Other updates based on feedback

Alistair Francis (27):
  target/riscv: Don't set write permissions on dirty PTEs
  target/riscv: Add the Hypervisor extension
  target/riscv: Add the virtulisation mode
  target/riscv: Add the force HS exception mode
  target/riscv: Fix CSR perm checking for HS mode
  target/riscv: Add the Hypervisor CSRs to CPUState
  target/riscv: Print priv and virt in disas log
  target/riscv: Dump Hypervisor registers if enabled
  target/riscv: Add Hypervisor CSR access functions
  target/riscv: Add Hypervisor virtual CSRs accesses
  target/riscv: Convert mie and mstatus to pointers
  target/riscv: Add virtual register swapping function
  target/riscv: Add support for virtual interrupt setting
  target/ricsv: Flush the TLB on virtulisation mode changes
  target/riscv: Generate illegal instruction on WFI when V=1
  riscv: plic: Always set sip.SEIP bit for HS
  target/riscv: Add hypvervisor trap support
  target/riscv: Add Hypervisor trap return support
  target/riscv: Add hfence instructions
  target/riscv: Disable guest FP support based on virtual status
  target/riscv: Mark both sstatus and vsstatus as dirty
  target/riscv: Respect MPRV and SPRV for floating point ops
  target/riscv: Allow specifying MMU stage
  target/riscv: Implement second stage MMU
  target/riscv: Add support for the 32-bit MSTATUSH CSR
  target/riscv: Add the MSTATUS_MPV_ISSET helper macro
  target/riscv: Allow enabling the Hypervisor extension

 hw/riscv/sifive_plic.c                        |  12 +-
 target/riscv/cpu.c                            |  61 ++-
 target/riscv/cpu.h                            |  55 +-
 target/riscv/cpu_bits.h                       |  45 +-
 target/riscv/cpu_helper.c                     | 481 ++++++++++++++++--
 target/riscv/csr.c                            | 262 +++++++++-
 target/riscv/insn32.decode                    |  23 +-
 .../riscv/insn_trans/trans_privileged.inc.c   |  40 ++
 target/riscv/op_helper.c                      |  81 ++-
 target/riscv/translate.c                      |  34 ++
 10 files changed, 988 insertions(+), 106 deletions(-)


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