Re: [PATCH v6 13/24] RISC-V: KVM: Implement SBI PMU Snapshot feature

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On Wed, Apr 10, 2024 at 05:07:41PM -0700, Atish Patra wrote:
> PMU Snapshot function allows to minimize the number of traps when the
> guest access configures/access the hpmcounters. If the snapshot feature
> is enabled, the hypervisor updates the shared memory with counter
> data and state of overflown counters. The guest can just read the
> shared memory instead of trap & emulate done by the hypervisor.
> This patch doesn't implement the counter overflow yet.
> Reviewed-by: Anup Patel <anup@xxxxxxxxxxxxxx>
> Signed-off-by: Atish Patra <atishp@xxxxxxxxxxxx>
> ---
>  arch/riscv/include/asm/kvm_vcpu_pmu.h |   7 ++
>  arch/riscv/kvm/vcpu_pmu.c             | 121 +++++++++++++++++++++++++-
>  arch/riscv/kvm/vcpu_sbi_pmu.c         |   3 +
>  3 files changed, 130 insertions(+), 1 deletion(-)

Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>

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