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RISC-V: KVM: Update firmware counters for various events

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SBI PMU specification defines few firmware counters which can be
used by the guests to collect the statstics about various traps
occurred in the host.

Update these counters whenever a corresponding trap is taken

Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20241224-kvm_guest_stat-v2-2-08a77ac36b02@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Atish Patra
2024-12-24 13:04:54 -08:00
committed by Anup Patel
parent 51c5895673
commit 2f15b5eaff
1 changed files with 27 additions and 4 deletions
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31
arch/riscv/kvm/vcpu_exit.c
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@@ -165,6 +165,17 @@ void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
vcpu->arch.guest_context.sstatus |= SR_SPP;
}
static inline int vcpu_redirect(struct kvm_vcpu *vcpu, struct kvm_cpu_trap *trap)
{
int ret = -EFAULT;
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV) {
kvm_riscv_vcpu_trap_redirect(vcpu, trap);
ret = 1;
}
return ret;
}
/*
* Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
* proper exit to userspace.
@@ -183,15 +194,27 @@ int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
run->exit_reason = KVM_EXIT_UNKNOWN;
switch (trap->scause) {
case EXC_INST_ILLEGAL:
kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_ILLEGAL_INSN);
ret = vcpu_redirect(vcpu, trap);
break;
case EXC_LOAD_MISALIGNED:
kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_MISALIGNED_LOAD);
ret = vcpu_redirect(vcpu, trap);
break;
case EXC_STORE_MISALIGNED:
kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_MISALIGNED_STORE);
ret = vcpu_redirect(vcpu, trap);
break;
case EXC_LOAD_ACCESS:
kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_ACCESS_LOAD);
ret = vcpu_redirect(vcpu, trap);
break;
case EXC_STORE_ACCESS:
kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_ACCESS_STORE);
ret = vcpu_redirect(vcpu, trap);
break;
case EXC_INST_ACCESS:
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV) {
kvm_riscv_vcpu_trap_redirect(vcpu, trap);
ret = 1;
}
ret = vcpu_redirect(vcpu, trap);
break;
case EXC_VIRTUAL_INST_FAULT:
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV)