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Thu, 12 Dec 2024 12:56:59 -0800 (PST) From: Atish Patra Date: Thu, 12 Dec 2024 12:56:55 -0800 Subject: [PATCH 2/3] RISC-V: KVM: Update firmware counters for various events Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241212-kvm_guest_stat-v1-2-d1a6d0c862d5@rivosinc.com> References: <20241212-kvm_guest_stat-v1-0-d1a6d0c862d5@rivosinc.com> In-Reply-To: <20241212-kvm_guest_stat-v1-0-d1a6d0c862d5@rivosinc.com> To: Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt Cc: kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Atish Patra X-Mailer: b4 0.15-dev-13183 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 Signed-off-by: Atish Patra Reviewed-by: Anup Patel --- arch/riscv/kvm/vcpu_exit.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c index c9f8b2094554..acdcd619797e 100644 --- a/arch/riscv/kvm/vcpu_exit.c +++ b/arch/riscv/kvm/vcpu_exit.c @@ -165,6 +165,17 @@ void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcp= u, vcpu->arch.guest_context.sstatus |=3D SR_SPP; } =20 +static inline int vcpu_redirect(struct kvm_vcpu *vcpu, struct kvm_cpu_trap= *trap) +{ + int ret =3D -EFAULT; + + if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV) { + kvm_riscv_vcpu_trap_redirect(vcpu, trap); + ret =3D 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 =3D KVM_EXIT_UNKNOWN; switch (trap->scause) { case EXC_INST_ILLEGAL: + kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_ILLEGAL_INSN); + ret =3D vcpu_redirect(vcpu, trap); + break; case EXC_LOAD_MISALIGNED: + kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_MISALIGNED_LOAD); + ret =3D vcpu_redirect(vcpu, trap); + break; case EXC_STORE_MISALIGNED: + kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_MISALIGNED_STORE); + ret =3D vcpu_redirect(vcpu, trap); + break; case EXC_LOAD_ACCESS: + kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_ACCESS_LOAD); + ret =3D vcpu_redirect(vcpu, trap); + break; case EXC_STORE_ACCESS: + kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_ACCESS_STORE); + ret =3D 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 =3D 1; - } + ret =3D vcpu_redirect(vcpu, trap); break; case EXC_VIRTUAL_INST_FAULT: if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV) --=20 2.34.1