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[31.30.173.16]) by smtp.gmail.com with ESMTPSA id bi24-20020a170906a25800b0092f38a6d082sm6314705ejb.209.2023.04.17.03.34.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Apr 2023 03:34:16 -0700 (PDT) From: Andrew Jones To: kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, virtualization@lists.linux-foundation.org Cc: 'Paul Walmsley ' , 'Albert Ou ' , 'Palmer Dabbelt ' , 'Paolo Bonzini ' , 'Juergen Gross ' , "'Srivatsa S . Bhat '" , 'Anup Patel ' , 'Atish Patra ' Subject: [RFC PATCH 06/14] RISC-V: KVM: Add steal-update vcpu request Date: Mon, 17 Apr 2023 12:33:54 +0200 Message-Id: <20230417103402.798596-7-ajones@ventanamicro.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230417103402.798596-1-ajones@ventanamicro.com> References: <20230417103402.798596-1-ajones@ventanamicro.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230417_033419_877949_7E04DB08 X-CRM114-Status: GOOD ( 12.87 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Add a new vcpu request to inform a vcpu that it should record its steal-time information. The request is made each time it has been detected that the vcpu task was not assigned a cpu for some time, which is easy to do by making the request from vcpu-load. The record function is just a stub for now and will be filled in with the rest of the steal-time support functions in following patches. Signed-off-by: Andrew Jones --- arch/riscv/include/asm/kvm_host.h | 3 +++ arch/riscv/kvm/vcpu.c | 5 +++++ arch/riscv/kvm/vcpu_sbi_sta.c | 4 ++++ 3 files changed, 12 insertions(+) diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index cc7da66ee0c0..d6c78750f7f2 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -37,6 +37,7 @@ KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) #define KVM_REQ_HFENCE \ KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(6) enum kvm_riscv_hfence_type { KVM_RISCV_HFENCE_UNKNOWN = 0, @@ -331,4 +332,6 @@ bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, unsigned long mask); void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu); void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); +void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu); + #endif /* __RISCV_KVM_HOST_H__ */ diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 02b49cb94561..733d87a13d42 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -901,6 +901,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) kvm_riscv_vcpu_guest_fp_restore(&vcpu->arch.guest_context, vcpu->arch.isa); + kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); + vcpu->cpu = cpu; } @@ -969,6 +971,9 @@ static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu) if (kvm_check_request(KVM_REQ_HFENCE, vcpu)) kvm_riscv_hfence_process(vcpu); + + if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu)) + kvm_riscv_vcpu_record_steal_time(vcpu); } } diff --git a/arch/riscv/kvm/vcpu_sbi_sta.c b/arch/riscv/kvm/vcpu_sbi_sta.c index de9ad7b7d010..40de9cc13cbf 100644 --- a/arch/riscv/kvm/vcpu_sbi_sta.c +++ b/arch/riscv/kvm/vcpu_sbi_sta.c @@ -8,6 +8,10 @@ #include #include +void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu) +{ +} + static int kvm_sbi_sta_set_steal_time_shmem(struct kvm_vcpu *vcpu) { return SBI_ERR_FAILURE; -- 2.39.2 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv