Re: [RFC PATCH 0/4] target/riscv/kvm: QEMU support for KVM Guest Debug on RISC-V

["Chao Du" <duchao@eswincomputing.com>]

Hi Daniel and all,

The KVM patches have been reviewd and are in the queue.
https://lore.kernel.org/all/20240402062628.5425-1-duchao@eswincomputing.com/

Could you please review in the QEMU side ?
Then I will rebase this series with your comments.

Some Notes:
1. As the first stage, only the software breakpoints is implemented.
2. A 'corner case' in which the debug exception is not inserted by the
debugger, need to be re-injected to the guest. This is not handled yet
in this series.

Thanks,
Chao


On 2023-12-22 22:16, Daniel Henrique Barboza <dbarboza@ventanamicro.com> wrote:
> 
> Hi,
> 
> It seems that we still need the kernel KVM side to be sorted out first [1],
> so I believe we should wait a bit until we can review this RFC. Otherwise we
> might risk reviewing something that has to be changed later.
> 
> 
> [1] https://lore.kernel.org/kvm/20231221095002.7404-1-duchao@eswincomputing.com/
> 
> 
> Thanks,
> 
> Daniel
> 
> On 12/21/23 06:49, Chao Du wrote:
> > This series implements QEMU KVM Guest Debug on RISC-V. Currently, we can
> > debug RISC-V KVM guest from the host side, with software breakpoints.
> > 
> > A brief test was done on QEMU RISC-V hypervisor emulator.
> > 
> > A TODO list which will be added later:
> > 1. HW breakpoints support
> > 2. Test cases
> > 
> > This series is based on QEMU 8.2.0-rc4 and is also available at:
> > https://github.com/Du-Chao/qemu/tree/riscv_gd_sw
> > 
> > This is dependent on KVM side changes:
> > https://github.com/Du-Chao/linux/tree/riscv_gd_sw
> > 
> > Chao Du (4):
> >    target/riscv/kvm: add software breakpoints support
> >    target/riscv/kvm: implement kvm_arch_update_guest_debug()
> >    target/riscv/kvm: handle the exit with debug reason
> >    linux-headers: enable KVM GUEST DEBUG for RISC-V
> > 
> >   accel/kvm/kvm-all.c           |   8 +--
> >   include/sysemu/kvm.h          |   6 +-
> >   linux-headers/asm-riscv/kvm.h |   1 +
> >   target/arm/kvm64.c            |   6 +-
> >   target/i386/kvm/kvm.c         |   6 +-
> >   target/mips/kvm.c             |   6 +-
> >   target/ppc/kvm.c              |   6 +-
> >   target/riscv/kvm/kvm-cpu.c    | 101 ++++++++++++++++++++++++++++++++++
> >   target/s390x/kvm/kvm.c        |   6 +-
> >   9 files changed, 130 insertions(+), 16 deletions(-)
> > 
> > --
> > 2.17.1
> >