This series does fixes and improvements to have nested virtualization
on QEMU RISC-V.

These patches can also be found in riscv_nested_fixes_v2 branch at:
https://github.com/avpatel/qemu.git

The RISC-V nested virtualization was tested on QEMU RISC-V using
Xvisor RISC-V which has required hypervisor support to run another
hypervisor as Guest/VM.

Changes since v1:
 - Set write_gva to env->two_stage_lookup which ensures that for
   HS-mode to HS-mode trap write_gva is true only for HLV/HSV
   instructions
 - Included "[PATCH 0/3] QEMU RISC-V priv spec version fixes"
   patches in this series for easy review
 - Re-worked PATCH7 to force disable extensions if required
   priv spec version is not staisfied
 - Added new PATCH8 to fix "aia=aplic-imsic" mode of virt machine

Anup Patel (8):
  target/riscv: Fix csr number based privilege checking
  target/riscv: Fix hstatus.GVA bit setting for traps taken from HS-mode
  target/riscv: Set [m|s]tval for both illegal and virtual instruction
    traps
  target/riscv: Update [m|h]tinst CSR in riscv_cpu_do_interrupt()
  target/riscv: Don't force update priv spec version to latest
  target/riscv: Add dummy mcountinhibit CSR for priv spec v1.11 or
    higher
  target/riscv: Force disable extensions if priv spec version does not
    match
  hw/riscv: virt: Fix interrupt parent for dynamic platform devices

 hw/riscv/virt.c           |  25 +++---
 target/riscv/cpu.c        |  46 +++++++++-
 target/riscv/cpu.h        |   8 +-
 target/riscv/cpu_bits.h   |   3 +
 target/riscv/cpu_helper.c | 172 ++++++++++++++++++++++++++++++++++++--
 target/riscv/csr.c        |  10 ++-
 target/riscv/instmap.h    |  41 +++++++++
 target/riscv/translate.c  |  17 +++-
 8 files changed, 292 insertions(+), 30 deletions(-)

-- 
2.34.1

On Thu, May 12, 2022 at 12:47 AM Anup Patel <apatel@ventanamicro.com> wrote:
>
> This series does fixes and improvements to have nested virtualization
> on QEMU RISC-V.
>
> These patches can also be found in riscv_nested_fixes_v2 branch at:
> https://github.com/avpatel/qemu.git
>
> The RISC-V nested virtualization was tested on QEMU RISC-V using
> Xvisor RISC-V which has required hypervisor support to run another
> hypervisor as Guest/VM.
>
> Changes since v1:
>  - Set write_gva to env->two_stage_lookup which ensures that for
>    HS-mode to HS-mode trap write_gva is true only for HLV/HSV
>    instructions
>  - Included "[PATCH 0/3] QEMU RISC-V priv spec version fixes"
>    patches in this series for easy review
>  - Re-worked PATCH7 to force disable extensions if required
>    priv spec version is not staisfied
>  - Added new PATCH8 to fix "aia=aplic-imsic" mode of virt machine
>
> Anup Patel (8):
>   target/riscv: Fix csr number based privilege checking
>   target/riscv: Fix hstatus.GVA bit setting for traps taken from HS-mode
>   target/riscv: Set [m|s]tval for both illegal and virtual instruction
>     traps
>   target/riscv: Update [m|h]tinst CSR in riscv_cpu_do_interrupt()
>   target/riscv: Don't force update priv spec version to latest
>   target/riscv: Add dummy mcountinhibit CSR for priv spec v1.11 or
>     higher
>   target/riscv: Force disable extensions if priv spec version does not
>     match
>   hw/riscv: virt: Fix interrupt parent for dynamic platform devices

Thanks!

I have applied some of these patches to riscv-to-apply.next

Alistair

>
>  hw/riscv/virt.c           |  25 +++---
>  target/riscv/cpu.c        |  46 +++++++++-
>  target/riscv/cpu.h        |   8 +-
>  target/riscv/cpu_bits.h   |   3 +
>  target/riscv/cpu_helper.c | 172 ++++++++++++++++++++++++++++++++++++--
>  target/riscv/csr.c        |  10 ++-
>  target/riscv/instmap.h    |  41 +++++++++
>  target/riscv/translate.c  |  17 +++-
>  8 files changed, 292 insertions(+), 30 deletions(-)
>
> --
> 2.34.1
>
>