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[0/2] RISC-V: KVM: SBI system suspend support

Message ID 20241017074538.18867-4-ajones@ventanamicro.com
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Series RISC-V: KVM: SBI system suspend support | expand

Message

Andrew Jones Oct. 17, 2024, 7:45 a.m. UTC 
The SBI spec provides a specification for system suspend to RAM and Linux
already supports invoking the SBI call for suspend to RAM when
CONFIG_SUSPEND is selected. Implement support for the SBI call in KVM
so guests may initiate a system suspend. However, since what a "system
suspend" means for a VM may differ between VM providers, leave it up
to the VMM to decide what to do. KVM only needs to ensure the entry
criteria for system suspend (per the spec) is met and prepare things for
the resume for when the VMM triggers it.

Tested with this kvmtool branch [1]

[1] https://github.com/jones-drew/kvmtool/commits/riscv/sbi-sys-susp/


Andrew Jones (2):
  RISC-V: KVM: Add SBI system suspend support
  KVM: riscv: selftests: Add SBI SUSP to get-reg-list test

 arch/riscv/include/asm/kvm_vcpu_sbi.h         |  1 +
 arch/riscv/include/uapi/asm/kvm.h             |  1 +
 arch/riscv/kvm/Makefile                       |  1 +
 arch/riscv/kvm/vcpu_sbi.c                     |  4 +
 arch/riscv/kvm/vcpu_sbi_system.c              | 73 +++++++++++++++++++
 .../selftests/kvm/riscv/get-reg-list.c        |  6 +-
 6 files changed, 85 insertions(+), 1 deletion(-)
 create mode 100644 arch/riscv/kvm/vcpu_sbi_system.c

Comments

Anup Patel Dec. 5, 2024, 6:08 a.m. UTC | #1 
On Thu, Oct 17, 2024 at 1:15 PM Andrew Jones <ajones@ventanamicro.com> wrote:
>
> The SBI spec provides a specification for system suspend to RAM and Linux
> already supports invoking the SBI call for suspend to RAM when
> CONFIG_SUSPEND is selected. Implement support for the SBI call in KVM
> so guests may initiate a system suspend. However, since what a "system
> suspend" means for a VM may differ between VM providers, leave it up
> to the VMM to decide what to do. KVM only needs to ensure the entry
> criteria for system suspend (per the spec) is met and prepare things for
> the resume for when the VMM triggers it.
>
> Tested with this kvmtool branch [1]
>
> [1] https://github.com/jones-drew/kvmtool/commits/riscv/sbi-sys-susp/
>
>
> Andrew Jones (2):
>   RISC-V: KVM: Add SBI system suspend support
>   KVM: riscv: selftests: Add SBI SUSP to get-reg-list test

Queued this series for 6.14

Thanks,
Anup

>
>  arch/riscv/include/asm/kvm_vcpu_sbi.h         |  1 +
>  arch/riscv/include/uapi/asm/kvm.h             |  1 +
>  arch/riscv/kvm/Makefile                       |  1 +
>  arch/riscv/kvm/vcpu_sbi.c                     |  4 +
>  arch/riscv/kvm/vcpu_sbi_system.c              | 73 +++++++++++++++++++
>  .../selftests/kvm/riscv/get-reg-list.c        |  6 +-
>  6 files changed, 85 insertions(+), 1 deletion(-)
>  create mode 100644 arch/riscv/kvm/vcpu_sbi_system.c
>
> --
> 2.46.2
>