RISC-V: KVM: Implement SBI PMU Snapshot feature

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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@brainfault.org>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20240420151741.962500-14-atishp@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>

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Atish Patra 2024-04-20 08:17:29 -07:00 • committed by Anup Patel

parent 2196c066f1

commit c2f41ddbcd

3 changed files with 130 additions and 1 deletions

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7

arch/riscv/include/asm/kvm_vcpu_pmu.h

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121

arch/riscv/kvm/vcpu_pmu.c

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3

arch/riscv/kvm/vcpu_sbi_pmu.c

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