[v5,0/2] target/loongarch: Add loongson binary translation feature

Message

Bibo Mao Sept. 29, 2024, 7:04 a.m. UTC

Loongson Binary Translation (LBT) is used to accelerate binary
translation. LBT feature is added in kvm mode, not supported in TCG
mode since it is not emulated.

Here lbt=on/off property is added to parse command line to
enable/disable lbt feature. Also fix registers relative lbt are saved
and restored during migration.

---
v4 ... v5:
  1. Define structure element eflags in structure LoongArchBT as
     uint32_t; in kernel eflags is defined as u64, however with
     ptrace and gdb interface it is defined u32, here defined as
     uint32_t to keep consistent from user view.
  2. sync patch with latest qemu version.

v3 ... v4:
  1. Verify and enable LBT feature in function kvm_arch_init_vcpu()
     rather than loongarch_cpu_post_init(), since LBT feature is only
     effective in kvm mode and function kvm_feature_supported() can be
     defined as static.
  2. Define structure element ftop in structure LoongArchBT as uint32_t
     to keep consist with kernel and real HW.

v2 ... v3:
  1. Property lbt is added only if kvm is enabled
  2. Use feature variable lbt with OnOffAuto type, rather than feature
     bitmap flags default_features and forced_features

v1 ... v2:
  1. Add LBT register saving and restoring in vmstate
  2. Add two pseudo feature flags: default_features and forced_features
---
Bibo Mao (2):
  target/loongarch: Add loongson binary translation feature
  target/loongarch: Implement lbt registers save/restore function

 target/loongarch/cpu.c                |  24 ++++++
 target/loongarch/cpu.h                |  18 ++++
 target/loongarch/kvm/kvm.c            | 119 +++++++++++++++++++++++++-
 target/loongarch/loongarch-qmp-cmds.c |   2 +-
 target/loongarch/machine.c            |  24 ++++++
 5 files changed, 185 insertions(+), 2 deletions(-)


base-commit: 3b14a767eaca3df5534a162851f04787b363670e

Comments

gaosong Oct. 22, 2024, 12:38 p.m. UTC | #1

在 2024/9/29 下午3:04, Bibo Mao 写道:
> Loongson Binary Translation (LBT) is used to accelerate binary
> translation. LBT feature is added in kvm mode, not supported in TCG
> mode since it is not emulated.
>
> Here lbt=on/off property is added to parse command line to
> enable/disable lbt feature. Also fix registers relative lbt are saved
> and restored during migration.
>
> ---
> v4 ... v5:
>    1. Define structure element eflags in structure LoongArchBT as
>       uint32_t; in kernel eflags is defined as u64, however with
>       ptrace and gdb interface it is defined u32, here defined as
>       uint32_t to keep consistent from user view.
>    2. sync patch with latest qemu version.
>
> v3 ... v4:
>    1. Verify and enable LBT feature in function kvm_arch_init_vcpu()
>       rather than loongarch_cpu_post_init(), since LBT feature is only
>       effective in kvm mode and function kvm_feature_supported() can be
>       defined as static.
>    2. Define structure element ftop in structure LoongArchBT as uint32_t
>       to keep consist with kernel and real HW.
>
> v2 ... v3:
>    1. Property lbt is added only if kvm is enabled
>    2. Use feature variable lbt with OnOffAuto type, rather than feature
>       bitmap flags default_features and forced_features
>
> v1 ... v2:
>    1. Add LBT register saving and restoring in vmstate
>    2. Add two pseudo feature flags: default_features and forced_features
> ---
> Bibo Mao (2):
>    target/loongarch: Add loongson binary translation feature
>    target/loongarch: Implement lbt registers save/restore function
>
>   target/loongarch/cpu.c                |  24 ++++++
>   target/loongarch/cpu.h                |  18 ++++
>   target/loongarch/kvm/kvm.c            | 119 +++++++++++++++++++++++++-
>   target/loongarch/loongarch-qmp-cmds.c |   2 +-
>   target/loongarch/machine.c            |  24 ++++++
>   5 files changed, 185 insertions(+), 2 deletions(-)
>
>
> base-commit: 3b14a767eaca3df5534a162851f04787b363670e
Reviewed-by: Song Gao <[e-mail]>

Thanks.
Song Gao